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The graph below shows the changes in transpiration rate and the width of the stomatal aperture in Zea mays (maize) over a 24-hour period.
a) What...
(Solved)
The graph below shows the changes in transpiration rate and the width of the stomatal aperture in Zea mays (maize) over a 24-hour period.
a) What is meant by the term transpiration?
b) Account for the rate of transpiration between
i)3am and 5am
ii)6am -12 noon
iii)1.00 pm -9.00 pm
Date posted:
June 14, 2019
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Answers (1)
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Suggest the biological significance of each of the following
i) Development of the pollen tube in fertilization in plants.
ii) Fusion of petals to form funnel-shaped corolla...
(Solved)
Suggest the biological significance of each of the following
i) Development of the pollen tube in fertilization in plants.
ii) Fusion of petals to form funnel-shaped corolla tube in certain
flowers.
Date posted:
June 14, 2019
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Answers (1)
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The diagram below shows exchange of materials between embryo’s bloodstreams and mother’s blood stream(i) Give the names of the parts labelled E and GEG(ii) Name...
(Solved)
The diagram below shows exchange of materials between embryo’s bloodstreams and mother’s blood stream
(i) Give the names of the parts labelled E and G
E
G
(ii) Name one substance that is in high concentration in E
(iii) In which organ does this kind of exchange shown occur?
Date posted:
June 14, 2019
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Answers (1)
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In a physiological experiment, starch, protein, diastase and sodium chloride (common salt) were added
to water and put inside a visking tubing. The visking tubing was...
(Solved)
In a physiological experiment, starch, protein, diastase and sodium chloride (common salt) were added
to water and put inside a visking tubing. The visking tubing was then placed in a water bath maintained at a temperature between 350C and 400C. The set-up was as shown in the diagram below.
The following observations were made after the procedures indicated.
(a) Name the process by which salt moved into the water in the beaker from the visking tubing.
(b) (i) Name the food substance responsible for the brown colour observed after one hour both in the beaker and visking tubing when solutions were boiled with Benedict’s solution.
(ii) Account for the observation in b(i) above.
(c) (i) Name the food substance tested with sodium hydroxide followed by copper sulphate solutions.
(ii) Account for the absence of the food substance named in c(i) above in the beaker after1 hour.
(d) After one hour, the visking tubing was firm. State the term used to describe this state.
Date posted:
May 29, 2019
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Answers (1)
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The figure below shows a germinating seedling.
(a) Name the parts labelled. A,B C
(b) Give three important environmental conditions that are necessary for seed germination...
(Solved)
The figure below shows a germinating seedling.
(a) Name the parts labelled. A,B C
(b) Give three important environmental conditions that are necessary for seed germination and state why they are important.
(c) The part labelled D was removed from the above seedling three months later. After a few days the plant became bushy with several lateral branches.
(i) What is this phenomenon called?
(ii) Why did the removal of the stem tip result in a shorter plant with bushy growth?
Date posted:
May 29, 2019
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Answers (1)
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The diagram below shows part of a food relationship in an ecosystem.
(a) Name the food relationship above.
(b) How many trophic levels are shown in...
(Solved)
The diagram below shows part of a food relationship in an ecosystem.
(a) Name the food relationship above.
(b) How many trophic levels are shown in the diagram above.
(c) Name one primary consumer in the food relationship above.
(d) State the main source of energy in the ecosystem.
Date posted:
May 29, 2019
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Answers (1)
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Explain the absence of fibrinogen in urine yet it is present in blood plasma.
(Solved)
Explain the absence of fibrinogen in urine yet it is present in blood plasma.
Date posted:
May 29, 2019
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Answers (1)
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The graph below shows the relationship between environmental temperature and the body temperature in two different animals A and B.
(a) State the relationship between the...
(Solved)
The graph below shows the relationship between environmental temperature and the body temperature in two different animals A and B.
(a) State the relationship between the body temperature of animal A and external environmental temperature.
(b) Give the term used to describe;
(i) Animals of type shown by graph A.
(ii) Animals of type represented by graph B.
Date posted:
May 29, 2019
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Answers (1)
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Below is a diagrammatic summary of the main biochemical events in photosynthesis. Study it carefully and answer the questions that follow.(a) Suggest the identity of molecule...
(Solved)
Below is a diagrammatic summary of the main biochemical events in photosynthesis. Study it
carefully and answer the questions that follow.
(a) Suggest the identity of molecule P.
(b) Name the gas represented by letter W.
(c) Name the specific site for the reactions in stage A.
(d) Name reaction Z.
Date posted:
May 29, 2019
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Answers (1)
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Work out a cross between a haemophilic man married to a carrier woman for haemophilia.
(Solved)
Work out a cross between a haemophilic man married to a carrier woman for haemophilia.
Date posted:
May 29, 2019
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Answers (1)
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What is the importance of a pooter to an ecologist?
(Solved)
What is the importance of a pooter to an ecologist?
Date posted:
May 29, 2019
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Answers (1)
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Explain why it is genetically unwise for sisters to marry brothers or father to marry their daughters.
(Solved)
Explain why it is genetically unwise for sisters to marry brothers or father to marry their daughters.
Date posted:
May 29, 2019
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Answers (1)
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A certain organ K was surgically removed from a rat. It was later found that there was a drastic increase in glucose level in the
blood....
(Solved)
A certain organ K was surgically removed from a rat. It was later found that there was a drastic increase in glucose level in the
blood. When substance Q was injected into the animal the glucose in the blood went back to normal. Identify
i) Organ K
ii) Substance Q.
Date posted:
May 29, 2019
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Answers (1)
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Explain the biological disadvantage of growing some aesthetic plants in the living rooms.
(Solved)
Explain the biological disadvantage of growing some aesthetic plants in the living rooms.
Date posted:
May 29, 2019
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Answers (1)
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In a family with four children three were found to have normal skin pigmentation while one was an albino. Using letter A to represent gene...
(Solved)
In a family with four children three were found to have normal skin pigmentation while one was an albino. Using letter A to represent gene for normal skin pigmentation and a to represent the gene for albinism.
(a) What are the possible genotypes of the parents?
(b) Work out the genotypic ratio of their children.
(c) Apart from albinism, name two disorders that are genetically inherited in human beings.
Date posted:
May 29, 2019
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Answers (1)
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A student collected a bone from the school garden. The bone was measuring 45 cm. He drew the bone in his book and his diagram...
(Solved)
A student collected a bone from the school garden. The bone was measuring 45 cm. He drew the bone in his book and his diagram was 9 cm long.Calculate the magnification of his drawing.
Date posted:
May 29, 2019
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Answers (1)
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In an ecological study a grass hopper population and that of crows was estimated in a certain grass land area over a period of
one year....
(Solved)
In an ecological study a grass hopper population and that of crows was estimated in a certain grass land area over a period of
one year. The results are as shown in the table below.
a) i) What is the relationship between the rainfall and grasshoppers population?
ii) Account for the relationship stated in a (i) above
b) Explain the relationship between the grasshopper and the crows population.
c) If the data was used in the construction of pyramid of numbers, what would be the trophic level of:
i) Grasshopper
ii) Crows
iii) The grass in the study area
d) If the area studied was on a square kilometer, state
i) One method that could have been used to estimate the grasshopper population.
ii) One method that could have been used to estimate the crows population.
e) Suggest what would happen if a predator for grasshoppers entered the study area.
Date posted:
May 29, 2019
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Answers (1)
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The diagram below represents a set-up to investigate a certain physiological process.
After some time the level of sugar solution was observed to have risen.
a) What...
(Solved)
The diagram below represents a set-up to investigate a certain physiological process.
After some time the level of sugar solution was observed to have risen.
a) What physiological process was being investigated.
b) Account for the rise in the level of sugar solution.
c) Suggest the result that would be observed if the experiment was repeated using a piece of boiled potato.
Date posted:
May 29, 2019
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Answers (1)
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The diagram below represents a gill of a bony fish . Study it and answer the questions that follow.
Give the function of each of the...
(Solved)
The diagram below represents a gill of a bony fish . Study it and answer the questions that follow.
Give the function of each of the lablled parts A, B and C
Date posted:
May 29, 2019
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Answers (1)
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a)Construct a dichotomous key to key out the following organisms using the following steps
Step 1: Body covering
Step 2: Animal with 3pairs of walking limbs or...
(Solved)
a)Construct a dichotomous key to key out the following organisms using the following steps
Step 1: Body covering
Step 2: Animal with 3pairs of walking limbs or more
Step 3: Animals with four pairs of legs
Step 4 : Number of walking limbs per segment.
b) With reasons state the class to which the organisms belong.
i) S. gregaria
ii) S. coleopata
Date posted:
May 28, 2019
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Answers (1)