Piece A was placed in a hypotonic solution while B was placed in a hypertonic solution;
Inner/cortex cells of piece A gained water while those of B lost water molecules by osmosis.
Cortex cells in A became turgid and increased in length curving outwards while in B the cells
became flaccid reduced in length curving inwards; The epidermal cells are covered by a waterproof
cuticle hence do not gain or loose water;
Kavungya answered the question on October 3, 2019 at 07:35
-
A cell magnified 800 times using a light microscope whose eye piece was x20. What was the magnification of the objective lens?
(Solved)
A cell magnified 800 times using a light microscope whose eye piece was x20. What was the magnification of the objective lens?
Date posted:
October 3, 2019
.
Answers (1)
-
During a field trip, a student collected a specimen that had the following characteristics
- 2 body parts
- More than 4 pairs of limbs
-had a carapace
(a)...
(Solved)
During a field trip, a student collected a specimen that had the following characteristics
- 2 body parts
- More than 4 pairs of limbs
-had a carapace
(a) Identify the class into which the organism belongs.
(b) Other than the head, name the other body part.
Date posted:
October 3, 2019
.
Answers (1)
-
Briefly explain the economic importance of the housefly and how it is controlled.
(Solved)
Briefly explain the economic importance of the housefly and how it is controlled.
Date posted:
October 1, 2019
.
Answers (1)
-
A certain metabolic pathway takes the following sequence.
J ----- K ----- L ----- M ----- N
At the start of the experiment an inhibitor was added to the reactants....
(Solved)
A certain metabolic pathway takes the following sequence.
J ----- K ----- L ----- M ----- N
At the start of the experiment an inhibitor was added to the reactants. After the experiment it was found that there was the same concentration of J more than normal concentration of K; near absence of L, M, and N.
When L was added to the inhibitor set M and N were detected.
a)At what stage of the reaction sequence did the inhibitor have its effects?
b)Explain how the inhibitor affected the reaction.
Date posted:
October 1, 2019
.
Answers (1)
-
Sickle – cell anaemia is a hereditary disease due to mutation of gene for normal haemoglobin to gene that causes sickle cell anaemia. What are...
(Solved)
Sickle – cell anaemia is a hereditary disease due to mutation of gene for normal haemoglobin to gene that causes sickle cell anaemia. What are the possible phenotype offspring of a man and a woman both heterozygous.
Date posted:
October 1, 2019
.
Answers (1)
-
Pollen from a red – flowered plant A was used to pollinate white flowered plant B, the seeds from which produced 157 red-flowered plants. When...
(Solved)
Pollen from a red – flowered plant A was used to pollinate white flowered plant B, the seeds from which produced 157 red-flowered plants. When a red flowered plant C was pollinated by a white-flowered plant D, the resultant seeds gave rise to 84 red-flowered plants: and 91 white flowered plants. Assuming that plants A, B, C, and D were all of the same species and that flower colour in that species is controlled by a single pair of genes.
Using R for dominant gene and r for recessive gene, write down the genotypes of the following.
i)Plant A
ii)Plant B
iii)Progeny of A x B cross
iv)Plant C
v)Plant D
vi)Red flowered progeny of C x D cross.
Date posted:
October 1, 2019
.
Answers (1)
-
Nocturnal animals such as the owl are capable of seeing fairly well at night. What two adaptations have made this possible.
(Solved)
Nocturnal animals such as the owl are capable of seeing fairly well at night. What two adaptations have made this possible.
Date posted:
October 1, 2019
.
Answers (1)
-
A scientist has discovered a rare disease that attacks the respiratory system in insects. Name two parts of an insect, which are most likely to...
(Solved)
A scientist has discovered a rare disease that attacks the respiratory system in insects. Name two parts of an insect, which are most likely to be damaged by the disease.
Date posted:
October 1, 2019
.
Answers (1)
-
Under what condition would a plant lose more water than its absorbing from the soil.
(Solved)
Under what condition would a plant lose more water than its absorbing from the soil.
Date posted:
October 1, 2019
.
Answers (1)
-
In maize, yellow colour is dominant over White colour. Using letter W to denote gene for maize colour, show how one would establish whether a...
(Solved)
In maize, yellow colour is dominant over White colour. Using letter W to denote gene for maize colour, show how one would establish whether a given sample of yellow maize is pure or a hybrid.
Date posted:
October 1, 2019
.
Answers (1)
-
Give the advantage of using low power magnification instead of high power when viewing specimens under a microscope.
(Solved)
Give the advantage of using low power magnification instead of high power when viewing specimens under a microscope.
Date posted:
September 30, 2019
.
Answers (1)
-
Give three features in Irish potato tube that qualify it to be a stem tuber.
(Solved)
Give three features in Irish potato tube that qualify it to be a stem tuber.
Date posted:
September 30, 2019
.
Answers (1)
-
Giving examples differentiate between ecto-parasites and endo-parasites.
(Solved)
Giving examples differentiate between ecto-parasites and endo-parasites.
Date posted:
September 30, 2019
.
Answers (1)
-
Quantity of Urine passed per day was established in five mammals A, B, C, D and E of the same species in their natural habitats....
(Solved)
Quantity of Urine passed per day was established in five mammals A, B, C, D and E of the same species in their natural habitats. The results are shown below.
(i) Which of the five Mammals was likely to be excreting Urine very rich in ammonia? Give a reason.
(ii) Which of the five mammals was likely to be living in a desert? Give a reason.
(iii) State two structural differences expected in the nephrons of mammals And D.
(iv) State how antidiuretic hormone (ADH) affect the amount of Urine produced by a mammal per day.
Date posted:
September 30, 2019
.
Answers (1)
-
State the principal requirement of filtration that forms glomeruli filtrate.
(Solved)
State the principal requirement of filtration that forms glomeruli filtrate.
Date posted:
September 30, 2019
.
Answers (1)
-
The organelle below is important in the process of Nutrition.
(Solved)
The organelle below is important in the process of Nutrition.
a) Identify the organelle
b) Name the parts labeled
c)Name the part where the following stages of photosynthesis occur
d)State the role of light in the processes of photosynthesis
Date posted:
September 30, 2019
.
Answers (1)
-
A student estimating a cell size of an onion epidermal cells observed the following on the microscope field of view using a transparent ruler.
(Solved)
A student estimating a cell size of an onion epidermal cells observed the following on the microscope field of view using a transparent ruler.
The student identified 20 cells across the field of view. Calculate the size of the cell inMicrometers (show your working)
Date posted:
September 30, 2019
.
Answers (1)
-
Explain why a thirsty person should not drink soda to quench the thirst.
(Solved)
Explain why a thirsty person should not drink soda to quench the thirst.
Date posted:
September 30, 2019
.
Answers (1)
-
Name the enzyme responsible for breaking down sodium hydrogen carbonate in mammalian blood to release carbon dioxide.
(Solved)
Name the enzyme responsible for breaking down sodium hydrogen carbonate in mammalian blood to release carbon dioxide.
Date posted:
September 30, 2019
.
Answers (1)
-
Study the diagram below and answer the questions that follow:
(Solved)
Study the diagram below and answer the questions that follow:
(a) Identify the organelle.
(b)Name the structure labelled K
(c)State two functions of the organelle named in (a) above
Date posted:
September 30, 2019
.
Answers (1)