i) Improves vision especially in dim light / night;
ii) Protects skin and cornea from dying and becoming scaly;
iii) Essential for normal growth in children and bone development;
sharon kalunda answered the question on May 23, 2019 at 13:50
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Give a reason why red blood cells have no nucleus.
(Solved)
Give a reason why red blood cells have no nucleus.
Date posted:
May 23, 2019
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Answers (1)
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Name two forms in which carbon (IV) oxide is transported in blood.
(Solved)
Name two forms in which carbon (IV) oxide is transported in blood.
Date posted:
May 23, 2019
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Answers (1)
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Name the class to which the tick belongs.
(Solved)
Name the class to which the tick belongs.
Date posted:
May 23, 2019
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Answers (1)
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The diagram below represents a cell organelle.
a) Name the part labelled B.
b) State the function of the part labelled A.
(Solved)
The diagram below represents a cell organelle.
a) Name the part labelled B.
b) State the function of the part labelled A.
Date posted:
May 23, 2019
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Answers (1)
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Study the photograph below. The specimen had been placed in adequate light at a horizontal position for one week.
i) What was the aim of this...
(Solved)
Study the photograph below. The specimen had been placed in adequate light at a horizontal position for one week.
i) What was the aim of this experiment?
ii) What would be the result if seedling is placed on a working klinostat?
iii) Explain how the results at the point shown by the arrow occurred.
Date posted:
May 23, 2019
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Answers (1)
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Below are drawings of some organisms belonging to the same phylum. Examine them carefully.
a) i) Name the phylum to which the organism represented by the...
(Solved)
Below are drawings of some organisms belonging to the same phylum. Examine them carefully.
a) i) Name the phylum to which the organism represented by the drawings belong.
ii) Give two reasons for answer in a(i) above.
b) Using the features in the order given below, construct a dichotomous key that can be used to identify the specimens.
- Presence or absence of wings.
- Shape of the body
- Length of antennae
- Type of wings
- Number of wings.
Date posted:
May 23, 2019
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Answers (1)
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Describe the adaptations of the following components of blood to its functions.
i) Red blood cell.
ii) White blood cells
(Solved)
Describe the adaptations of the following components of blood to its functions.
i) Red blood cell.
ii) White blood cells
Date posted:
May 23, 2019
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Answers (1)
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Describe how water reaches the xylem tissue of the root in a plant from the soil.
(Solved)
Describe how water reaches the xylem tissue of the root in a plant from the soil.
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 represents a food web in a certain ecosystem.
a) i) Name the group of organisms that would have the largest biomass
ii) Give...
(Solved)
The diagram below represents a food web in a certain ecosystem.
a) i) Name the group of organisms that would have the largest biomass
ii) Give a reason for your answer in a(i) above.
b) Construct food chain ending with
i) Tertiary consumer
ii) Quaternary consumer
c) State two short term effects on the ecosystem if there were prolonged droughts.
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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State the function of a tendon in mammalian skeleton.
(Solved)
State the function of a tendon in mammalian skeleton.
Date posted:
May 23, 2019
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Answers (1)
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Give two adaptive features the make a predator efficient in capturing prey.
(Solved)
Give two adaptive features the make a predator efficient in capturing prey.
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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Explain what happens when diaphragm muscles contract during breathing in mammals.
(Solved)
Explain what happens when diaphragm muscles contract during breathing in mammals.
Date posted:
May 23, 2019
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Answers (1)
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How does drug abuse expose one to the dangers of HIV/AIDS?.
(Solved)
How does drug abuse expose one to the dangers of HIV/AIDS?.
Date posted:
May 23, 2019
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Answers (1)
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In an experiment to observe some variations in lengths of leaves of Jacaranda, the following curve was obtained.
i) Identify the type of variation illustrated by...
(Solved)
In an experiment to observe some variations in lengths of leaves of Jacaranda, the following curve was obtained.
i) Identify the type of variation illustrated by the curve.
ii) Explain the cause of the variation you have named in (i) above.
Date posted:
May 23, 2019
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Answers (1)
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In an experiment, two equal volumes of solutions L and M were placed into visking tubings. The two viskig tubings were
suspended as shown below.
(Solved)
In an experiment, two equal volumes of solutions L and M were placed into visking tubings. The two viskig tubings were
suspended as shown below.
Explain the results that were obtained in the visking tubings at the end of the experiment.
Date posted:
May 23, 2019
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Answers (1)