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(a) Photosynthesis is controlled by enzymes ; the enzymes are denatured at high temperature; hence
Decrease in product formation. (2 mks)
(b)(i) The rate of product formation is low and constant; enzymes are inactive at low temperature;
(ii) Rate of photosynthesis is high and constant;
This is the optimum temperature for the enzyme activity; (4 mks)
(c)(i) Light intensity / carbon (iv) oxide; (1 mk)
(ii) Oxygen / glucose / starch;
sharon kalunda answered the question on May 27, 2019 at 12:33
- The diagram below shows a model of the nephron of a mammalian kidney.
(a) Which parts of the nephron are represented by the:
(i) Syringe?
(ii) Perforated rubber...(Solved)
The diagram below shows a model of the nephron of a mammalian kidney.
(a) Which parts of the nephron are represented by the:
(i) Syringe?
(ii) Perforated rubber tubing?
(iii) Free rubber tubing?
(b) Name the type of filtration taking place within the perforated rubber tubing.
(c) What would happen to the contents of the syringe if its handle was slowly pushed forward? Explain.
Date posted: May 27, 2019. Answers (1)
- Use the photographs provided to answer the questions that follow:
a) (i) Identify the type of cell division represented in the photographs A and B.
(ii)...(Solved)
Use the photographs provided to answer the questions that follow:
a) (i) Identify the type of cell division represented in the photographs A and B.
(ii) With a reason, name the stage of cell division represented in each case.
(iii) Name the parts of human body where the process B represented above occur.
b) (i) What type of fruit is represented by photograph I? Give two reasons.
(ii) Name the agent of dispersal for fruits II and III.
(iii) How are the fruits adapted for the mode of dispersal stated in (b) ( ii) above?
(iv) Identify the type of placentation shown by photograph I.
Date posted: May 27, 2019. Answers (1)
- Below are pictures from two different organisms.
(i) What is the specific function of the two structures shown in the pictures?
(ii) What type of structures...(Solved)
Below are pictures from two different organisms.
(i) What is the specific function of the two structures shown in the pictures?
(ii) What type of structures is represented by the two structures shown on the pictures?
Date posted: May 27, 2019. Answers (1)
- The picture below shows series of beaks in birds.
a) State the type of evolution that may have led to the emergence of the different beaks...(Solved)
The picture below shows series of beaks in birds.
a) State the type of evolution that may have led to the emergence of the different beaks shown on the pictures above.
(b) Name the type of evolution structure represented by the beaks shown on the pictures above.
(c) Observe the pictures carefully. From your observations, what features are responsible for the different types of beaks?
(d) Suggest the type of food likely eaten by birds whose beaks are shown in pictures A, B, C and D.
(e) Briefly state how beak shown in picture A is adapted to feeding.
Date posted: May 27, 2019. Answers (1)
- The photographs below represent different types of animals. Study them carefully and answer the questions that follow.
(a) State two observable differences between K and M....(Solved)
The photographs below represent different types of animals. Study them carefully and answer the questions that follow.
(a) State two observable differences between K and M.
(b) Classify specimen M into the following taxa giving reasons for each case.
(i) Phylum
Reasons
(ii) Class
(iii) Reasons
(c) Name the type of skeleton found in the specimen O.
(d) (i) Name the class to which the specimen N belongs.
(ii) Give three reasons for your answer in (d) (i) above.
Date posted: May 27, 2019. Answers (1)
- You have been provided with photographs of specimens labelled Q1, Q2 and Q3. Examine them.
a) By using observable features only, state the phylum and class...(Solved)
You have been provided with photographs of specimens labelled Q1, Q2 and Q3. Examine them.
a) By using observable features only, state the phylum and class to which the specimens belong. By using the three specimens, give reasons for each case.
(a) Phylum
Reasons
(b) Class
Reasons
(c) Using observable features only, give three differences between specimen Q1 and Q3.
(d) (i) Apart from locomotion, state the other role of the hind limbs of specimen Q1.
(ii) How are the hind limbs of specimen Q1 adapted to perform role named in d (i) above.
Date posted: May 27, 2019. Answers (1)
- Study the photographs below and answer the questions below.
(i) To which phylum does organisms x,y and z belong to.
(ii) Name the classes to which...(Solved)
Study the photographs below and answer the questions below.
(i) To which phylum does organisms x,y and z belong to.
(ii) Name the classes to which X, Y and Z belongs to.
(iii) Give two important economic roles of specimen Y.
(iv) Give three harmful effects of specimen X to animals.
(v) With reasons identify two modes of locomotion of specimen Y .
Date posted: May 27, 2019. Answers (1)
- Study the photographs below and answer the questions below.
a) Name the sub-division of the plant from which the photo was taken.
b) Using observable features...(Solved)
Study the photographs below and answer the questions below.
a) Name the sub-division of the plant from which the photo was taken.
b) Using observable features on the photograph give reasons for your answer in (a) above.
c) Name the agent of pollination for the flower in the photograph
d) State three observations on the photograph that supports your answer in (c) above.
e) Name the class of the plant from which the photo was taken.
f) Using observable features on the photograph, give three reasons for your answer in (e) above.
g) Give two adaptations of the part labeled B to its pollination function.
Date posted: May 27, 2019. Answers (1)
- The photographs in Plate J, K and L shows the anterior part of two different animals,
Plate L shows the longitudinal dissection of Plate K. Examine...(Solved)
The photographs in Plate J, K and L shows the anterior part of two different animals,
Plate L shows the longitudinal dissection of Plate K. Examine the photographs and answer the questions below.
(a) (i) State the class to which the animal organ in Plate J belongs.
(ii) State the habitat of the animal.
(iii) Give a reason for your answer in (ii) above.
(b) (i) Name the organ shown in the photograph in Plate J.
(ii) State the function of the organ named above (i).
(iii) Name the structure that protects the organ named in (b(i) above from mechanical damage .
(iv) From observable features only explain three adaptation of the organ to its function.
(c) (i) Identify the structure in the photograph Plate K and L.
(ii) Give a reason for your answer.
(iii) Using observable features only state three adaptations of the structure to its functions.
Date posted: May 27, 2019. Answers (1)
- Study the photographs and answer the following questions.
I) The photograph in Plate 5 shows the germination process in a species of legume.
(a) (i) Name the...(Solved)
Study the photographs and answer the following questions.
I) The photograph in Plate 5 shows the germination process in a species of legume.
(a) (i) Name the type of germination shown in the photograph.
(ii) Give a reason for your answer.
(b) Other than germination the seedling have shown some responses.
(i) Name two responses shown in the photograph.
(ii) State one survival value of each of the response named above.
(II) Examine the photograph in Plate 6 and Plate 7 which show different essential parts of a flower of a species on two different plants.
(a) Name the flower parts shown in Plate 6 and Plate 7.
(b) (i) Name the phenomenon described in the statement above.
(ii) Explain the significance of the phenomena stated in (a)(i) above.
(c) (i) State the mode of pollination of the flower shown in the photograph.
(ii) Give a reason for your answer.
(d) (i) State the type of pollination of the flower shown in the photograph.
(ii) Give two reasons for your answer.
Date posted: May 27, 2019. Answers (1)
- Below are drawing of various organisms. Examine them.
i ) Name the phylum to which B belongs.
ii) Give three reasons for your answer in (a) (i)...(Solved)
Below are drawing of various organisms. Examine them.
i ) Name the phylum to which B belongs.
ii) Give three reasons for your answer in (a) (i) above.
b) Name the class to which specimen A belongs.
c) Give three differences between specimen B and E.
d)Use the dichotomous key provided to identify the organism.
a) Jointed legs present............................................................................ go to 2
b) Jointed legs absent.............................................................................. go to 7
a) Have 3 pairs of legs............................................................................ go to 3
b) Have more than 3 pairs of legs........................................................... go to 5
a) With wings.......................................................................................... go to 4
b) Without wings.................................................................................... Anoplura
a) Have one pair of wings....................................................................... Diptera
b) Have two pairs of wings..................................................................... Hymenoptera
a) Have four pairs of legs........................................................................ Arachnida
b) Have more than 10 pairs of legs.......................................................... go to 6
a) With one pair of legs per segment...................................................... Chilopoda
b) With two pairs of legs per body segment........................................... Diplopoda
a) With body enclosed in a shell............................................................. Mollusca
b) Body surface with spiny projections................................................... Echinodermata.
Identify steps followed to identify organism A, B, C, and E
Date posted: May 27, 2019. Answers (1)
- i)Identify the type of ovary shown in the photographs below.
ii) Name the parts labeled K and L
iii)Identify the type of section shown in the...(Solved)
i)Identify the type of ovary shown in the photographs below.
ii) Name the parts labeled K and L
iii)Identify the type of section shown in the photographs X and Y above.
Date posted: May 27, 2019. Answers (1)
- The photographs below show different plants.
a) Name the class of the plants from which the photographs were taken.
b) Name the agent of pollination for the...(Solved)
The photographs below show different plants.
a) Name the class of the plants from which the photographs were taken.
b) Name the agent of pollination for the flowers in the photographs above.
c) State one observation on the photographs that support your answer in (b) above.
Date posted: May 27, 2019. Answers (1)
- Describe the effects of the various abiotic factors in a terrestrial ecosystem to plants.(Solved)
Describe the effects of the various abiotic factors in a terrestrial ecosystem to plants.
Date posted: May 27, 2019. Answers (1)
- Describe the role of the mammalian liver in carbohydrate metabolism.(Solved)
Describe the role of the mammalian liver in carbohydrate metabolism.
Date posted: May 27, 2019. Answers (1)
- In an experiment, lactic acid concentration was measured before, during and after exercise to determine the effect of exercise on the concentration of lactic acid...(Solved)
In an experiment, lactic acid concentration was measured before, during and after exercise to determine the effect of exercise on the concentration of lactic acid in blood. Study the data obtained and use it to answer the questions that follow.
a) Plot a graph of the concentration of lactic acid against time using a suitable scale. (6 marks)
b) From the graph:
i) Determine the period of exercise.
ii) Explain
c) i) Determine the time when oxygen debt incurred.
ii) Explain
d) i) The duration it took to pay back the oxygen debt
ii) Explain
e) Plot a hypothetical curve for oxygen intake during the experimental period on the same axes.
f) Why does lactic acid level usually continue to rise in the blood after the exercise ceases?
g) State two of effects of lactic acid on tissues.
Date posted: May 27, 2019. Answers (1)
- Name the gland associated with the secretion of aldosterone hormone.(Solved)
Name the gland associated with the secretion of aldosterone hormone.
Date posted: May 27, 2019. Answers (1)
- The diagram below is a longitudinal section of an organ in mammals.
a) Name the organ.
b) Identify the parts R and S.
c) i) State three...(Solved)
The diagram below is a longitudinal section of an organ in mammals.
a) Name the organ.
b) Identify the parts R and S.
c) i) State three differences in the structure above found in the desert rat and fish.
ii) Account for the differences stated above.
(d) Name the gland associated with the secretion of aldosterone hormone.
Date posted: May 27, 2019. Answers (1)
- The diagram below is a cross section of a portion of alimentary canal.
a) i) Which part of the alimentary canal is represented by the portion...(Solved)
The diagram below is a cross section of a portion of alimentary canal.
a) i) Which part of the alimentary canal is represented by the portion above.
ii) Give a reason for your answer in (a) (i) above.
b) i) State two functions of the part of alimentary canal represented above.
ii) Explain two structural adaptations of the part of alimentary canal represented above.
Date posted: May 27, 2019. Answers (1)
- The colour of tips of hair in Shepherd dog is controlled by a gene with three alleles B for Black, R for red and C...(Solved)
The colour of tips of hair in Shepherd dog is controlled by a gene with three alleles B for Black, R for red and C for copper.
A cross between pure breeding red and copper hair tips produce offsprings with scarlet hair tips. Crossing pure breeding
red and black hair tips yields all red offsprings. A cross between pure breeds of copper and black produce offsprings that
are all copper.
a) Comment on the inheritance of the three alleles B, R and C.
b) A dog breeder wishes to know the genotype of a dog with red hair tips. State and explain the cross needed to determine
the dog’s genotype.
c) A mother of blood group AB was married to a man of blood group B heterozygous. What is the probability that one of
their sons would be blood group A? Show your working.
Date posted: May 27, 2019. Answers (1)