a) (i) The level of caustic potash in retort flask rises ;
(ii)Oxygen has been used up by germinating peas ‘The caustic potash raises to occupy the spaces ;
(b) No observable change ;
sharon kalunda answered the question on May 24, 2019 at 09:20
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Describe the way by which terrestrial plants are adapted to living in arid and semi-arid ecosystems.
(Solved)
Describe the way by which terrestrial plants are adapted to living in arid and semi-arid ecosystems.
Date posted:
May 24, 2019
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Answers (1)
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Describe the adaptations of wind pollinated flowers.
(Solved)
Describe the adaptations of wind pollinated flowers.
Date posted:
May 24, 2019
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Answers (1)
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The diagram below represent a seedling.
a) Name the structure labelled B
b) State the functions of the parts labelled A and C
c) Name the...
(Solved)
The diagram below represent a seedling.
a) Name the structure labelled B
b) State the functions of the parts labelled A and C
c) Name the type of germination exhibited by the seedling.
d) State three conditions within the seed necessary for germination.
e) What is the importance of optimum temperature in seed germination ?
Date posted:
May 24, 2019
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Answers (1)
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The diagram below represents a transverse section of a young stem.
a) Name the parts labelled A and C on the diagram.
b) State the functions...
(Solved)
The diagram below represents a transverse section of a young stem.
a) Name the parts labelled A and C on the diagram.
b) State the functions of the parts labelled B, D and E
c) List three differences between the section shown above and one that would be obtained from the
root of the same plant.
Date posted:
May 24, 2019
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Answers (1)
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The diagram below is a cross section through a part of human ileum.
a) i) Identify the structure drawn above.
ii) State the significance of the...
(Solved)
The diagram below is a cross section through a part of human ileum.
a) i) Identify the structure drawn above.
ii) State the significance of the structure shown above.
b) Name the parts labelled A, B and C
c) Give the functions of the part labelled B and C.
Date posted:
May 24, 2019
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Answers (1)
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The diagram below represents phloem tissue from the stem of a plant.
i) Name the structure labelled A.
ii) State TWO substances transported in the phloem....
(Solved)
The diagram below represents phloem tissue from the stem of a plant.
i) Name the structure labelled A.
ii) State TWO substances transported in the phloem.
iii) Give the function of cell B.
Date posted:
May 24, 2019
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Answers (1)
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The diagram below represents recycling of nutrients in a certain ecosystem.
a) Name the trophic level represented by M.
b) Name the processes represented by. I,II,III...
(Solved)
The diagram below represents recycling of nutrients in a certain ecosystem.
a) Name the trophic level represented by M.
b) Name the processes represented by. I,II,III
c) Name the organisms involved in process II.
d) What would happen within the ecosystem if all secondary consumers were eliminated?
Date posted:
May 24, 2019
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Answers (1)
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The diagram below represents the internal structure of a bean seed.
a) Name the parts the seed embryo represented by letter X and Y.
b) What...
(Solved)
The diagram below represents the internal structure of a bean seed.
a) Name the parts the seed embryo represented by letter X and Y.
b) What type of germination would result if the hypocotyl elongates faster.
c) What is the significance of the part labelled Y emerging first during germination.
Date posted:
May 24, 2019
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Answers (1)
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An investigation was carried to show the effect of antidiuretic hormone (ADH) on urine production in a mammal. The rate of urine production was measured...
(Solved)
An investigation was carried to show the effect of antidiuretic hormone (ADH) on urine production in a mammal. The rate of urine production was measured over a period of 30 minutes. Five minutes after measurements began; ADH was injected into a vein of the mammal. The results are shown in table below.
a) Plot a graph of rate of urine production against time.
b) Name the gland that releases ADH.
c) Describe the effect of injection of ADH on the rate of urine production in the mammal in this investigation.
d) Describe the mechanism by which ADH produces the effect seen in this investigation.
e) In a similar investigation, an injection of sodium chloride (salt) solution was given after five minutes instead of ADH. This injection was observed to affect urine production in a similar way to ADH. Suggest how the sodium chloride brought about this effect.
Date posted:
May 24, 2019
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Answers (1)
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State any two differences between an ovum and a sperm.
(Solved)
State any two differences between an ovum and a sperm.
Date posted:
May 24, 2019
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Answers (1)
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The diagram below represents the nitrogen cycle.
a) State the process labelled.
A
D
b) Name the compound represented by B.
c) Name the group of organisms labelled...
(Solved)
The diagram below represents the nitrogen cycle.
a) State the process labelled.
A
D
b) Name the compound represented by B.
c) Name the group of organisms labelled C.
d) i) Name the group of plants which promote process A.
ii) State the part of the plant where process A takes place.
e) How would excess pesticides in the soil interfere with process A.
Date posted:
May 24, 2019
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Answers (1)
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Give a reason why lack of roughage in the diet often leads to constipation.
(Solved)
Give a reason why lack of roughage in the diet often leads to constipation.
Date posted:
May 23, 2019
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Answers (1)
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Explain how the process of evolution may result to the formation of a new species.
(Solved)
Explain how the process of evolution may result to the formation of a new species.
Date posted:
May 23, 2019
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Answers (1)
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In an experiment to investigate an aspect of digestion, two test tubes A and B were set up as shown in the diagram below.
a) What...
(Solved)
In an experiment to investigate an aspect of digestion, two test tubes A and B were set up as shown in the diagram below.
The test tubes were left in the bath for 30 minutes. The contents of each test tube was then tested for starch using iodine solution.
a) What was the aim of the experiment?
b) What results were expected in test tube A and B.
c) Account for the results you have given in (b) above in test tube A and B.
d) Why was the set up left at 37°C?
Date posted:
May 23, 2019
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Answers (1)
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The diagram below represents a mammalian embryo and associated maternal structures.
a) Name the parts labelled R and S.
b) State THREE adaptation of part Q...
(Solved)
The diagram below represents a mammalian embryo and associated maternal structures.
a) Name the parts labelled R and S.
b) State THREE adaptation of part Q to its functions.
c) i) Name the part labelled T.
ii) What is the function of part T?
Date posted:
May 23, 2019
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Answers (1)
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The diagram below shows how blood glucose in mammalian body is regulated.
a) Explain what happens during corrective mechanism P.
b) Name two organs involved in...
(Solved)
The diagram below shows how blood glucose in mammalian body is regulated.
a) Explain what happens during corrective mechanism P.
b) Name two organs involved in corrective mechanisms P and Q.
c) State two reasons why glucose level should be maintained constant.
d) What is osmoregulation?
Date posted:
May 23, 2019
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Answers (1)
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A woman with normal skin pigmentation was married to a man with normal skin pigmentation. They had two children, one
with normal skin colour, genotype AA,...
(Solved)
A woman with normal skin pigmentation was married to a man with normal skin pigmentation. They had two children, one
with normal skin colour, genotype AA, while the other one was an albino.
a) State the couple's genotypes.
b) Using a genetic cross, show how they were able to produce an albino and a normal skinned child.
c) What is the percentage of their third child being an albino?.
d) State one way one could easily identify an albino.
Date posted:
May 23, 2019
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Answers (1)
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Give two reasons why potato tubers become sweeter after boiling.
(Solved)
Give two reasons why potato tubers become sweeter after boiling.
Date posted:
May 23, 2019
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Answers (1)
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An experiment was set up to demonstrate the necessity of carbon (IV) oxide for
photosynthesis in a certain green plant as shown below. The plant was...
(Solved)
An experiment was set up to demonstrate the necessity of carbon (IV) oxide for
photosynthesis in a certain green plant as shown below. The plant was first kept
darkness for 48 hours before the experiment.
a), Why was the plant kept in darkness for 48 hours before the start of this experiment.
b), What was the role of sodium hydroxide?
ci)What was the results shown by the leaf in the flask when it was tested for presence of starch after
the set up was exposed to light for a day?.
ii), Give reasons for your answer in (c) I above
d. Suggest a control for this experiment.
e), Name other two limiting factors in this experiment.
Date posted:
May 22, 2019
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Answers (1)
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The diagram below shows some components of a light microscope.
a), Name the parts labeled
K –
M –
b), State the functions of
P –
Q –
c) A...
(Solved)
The diagram below shows some components of a light microscope.
a), Name the parts labeled
K –
M –
b), State the functions of
P –
Q –
c) A student was viewing a prepared slide of a plant cell under high power microscope.
The features of the cell were blurred. Which one of the labeled parts of the microscope
would the student use to obtain; A sharper outline of the features
Date posted:
May 22, 2019
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Answers (1)