Get premium membership and access revision papers, questions with answers as well as video lessons.

Borabu Masaba District Mock-Biology Paper 2 Question Paper

Borabu Masaba District Mock-Biology Paper 2

Course:Secondary Level

Exam Year:2012

NAME:……………………………………………………… INDEX NO:…………………………
SCHOOL:………………………………………………….. DATE:……………………………….
SIGN:………………………………..

231/2
BIOLOGY
PAPER 2
(THEORY)
JULY/AUGUST - 2012
TIME: 2 HOURS

BORABU-MASABA DISTRICTS JOINT EVALUATION TEST– 2012
Kenya Certificate of Secondary Education (K.C.S.E)

231/2
BIOLOGY
PAPER 2
(THEORY)
JULY/AUGUST - 2012
TIME: 2 HOURS

Answer ALL questions in this section in the spaces provided.
1. The diagram below illustrates and experiment to determine the rate of respiration in a small insect.

a) Name the chemical compound labelled X and state its function. (2mks)
............................................................................................................................................................. .............................................................................................................................................................
b) Why is it necessary to place the flask in a water bath. (3mks)
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
c) What changes would you expect to observe in the level of coloured water in the capillary tube after the experiment has run for five minutes. (1mk)

............................................................................................................................................................. .............................................................................................................................................................
d) Explain the changes you have started in ( c) above. (3mks)
............................................................................................................................................................. .............................................................................................................................................................
e) State how you can set up a control experiment . (1mk)
............................................................................................................................................................. .............................................................................................................................................................

2. The diagram below represents a plant cell organelle

a) Name the organelle. (1mk)
.............................................................................................................................................................
b) In which of the labelled parts does carbon (IV) Oxide fixation occur? (1mk)

c) Name the parts labelled A and B and state how each is adapted to its functions. (4mks)

A.................................................................................................................................................................................................................................................................................................
B.................................................................................................................................................................................................................................................................................................
d) Explain what would have happened to the structures labelled X had the plant been kept in darkness for 48 hours. (2mks)
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
3. The diagram below shows a cross section through the female part of a flower.

a) Name the structures labelled W,X, and Y. (3mks)

. X .....................................................................

Y .......................................................................

Z .......................................................................

b) State two functions of the pollen tube. (2mks)
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
c) What happens to antipodal cells after fertilization. (1mk) ............................................................................................................................................................. .............................................................................................................................................................
d) Name the structure labelled K and state their role. (2mks)
............................................................................................................................................................. .............................................................................................................................................................
4. a) Name any three defects of the circulatory system in humans. (3mks)
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
b) How are leucocytes adapted to their function. (2mks)
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
c) Name the blood vessel with the highest ionic extraction of
i) Glucose (1mk)
............................................................................................................................................................. .............................................................................................................................................................
ii) Carbon (IV) Oxide. (1mk)
............................................................................................................................................................. .............................................................................................................................................................
d) What is the importance of tissue fluid. (1mk)
............................................................................................................................................................. .............................................................................................................................................................
5. Below is a pedigree chart showing the incidences of colour blindness trait linked to the X – chromosome transmitted through a recessive gene. Study the diagram and answer the following questions.

a) Gives the genotypes of person 1 and 2
1 ....................................................................
2 ...............................................................................
b) Explain why there are no male carriers for this conduction. (1mk)
............................................................................................................................................................. .............................................................................................................................................................

6. Explain why there are more colour blind male than female in a population. (3mks)
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................

SECTION B( 40 MARKS)
Answer questions 6 ( compulsory)and either questions 7 or 8 in the spaces provided questions 8
7. The glucose level in mg per 100cm3 of blood was determined in two person Y and Z. Both had stayed for six hours without taking food. They were fed on equal amount of glucose at the start of the experiment .The amount of glucose in their blood was determined at intervals .The results are shown in the table below.
Times in minutes Glucose level in blood in mg /100cm3
Y Z
0 85 78
20 105 110
30 105 110
45 130 170
60 100 195
80 93 190
100 90 140
120 90 130
140 88 120
a) On the grid provided, plot graphs of glucose levels in blood against time on the same axes.
(7mks)

b) What was the concentration of glucose in the blood of Y and Z at the 50th minute? (2mks)
Y .........................................................................
Z ..........................................................................
c) Account for the level of glucose in present Y
i) During the first 45 minutes. (2mks)
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
ii) After 45th minute to the end. (4mks)
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
d) Account for the decrease in glucose level person Z after 60 minutes. (2mks)
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
e) Low blood sugar level in harmful to the body .Explain. (3mks)
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
7. a) What assumption are made when using the captured recapture method in estimating
population of animals. (5mks)
b) Describe how you would use the capture – recapture method to estimate the population of fish in the school pond. (15mks)
8. Describe the structure and function of the various parts of the mammalian brain. (20mks)
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
.............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
.............................................................................................................................................................
............................................................................................................................................................. .............................................................................................................................................................
.............................................................................................................................................................

Borabu Masaba District Mock-Biology Paper 2 Question Paper

More Question Papers

Popular Exams