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Name the division of the Kingdom plantae with the following spore producing bodies.
(i) Sori
(ii) Capsule
(Solved)
Name the division of the Kingdom plantae with the following spore producing bodies.
(i) Sori
(ii) Capsule
Date posted:
September 16, 2019
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Answers (1)
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A small amount of chemical M was put on one side of maize celeoptiles. After some days, it was noted that the celeoptiles curved away...
(Solved)
A small amount of chemical M was put on one side of maize celeoptiles. After some days, it was noted that the celeoptiles curved away from the side to which the chemical was applied.
(a) Suggest the possible identity of chemical substance M
(b) Explain how this chemical might have caused the celeoptiles to curve.
Date posted:
September 16, 2019
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Answers (1)
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Industrial wastes may contain metabolic pollutants. State how such pollutants may indirectly reach and accumulate in the human body if the wastes were dumped into...
(Solved)
Industrial wastes may contain metabolic pollutants. State how such pollutants may indirectly reach and accumulate in the human body if the wastes were dumped into rivers.
Date posted:
September 16, 2019
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Answers (1)
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The apparatus whose diagram is given below can be used to demonstrate results of a physiological process that occurs in a mammal. To use the...
(Solved)
The apparatus whose diagram is given below can be used to demonstrate results of a physiological process that occurs in a mammal. To use the apparatus, the experiment places his mouth at the point marked X and breaths in and out gently.
a. State the observations in the boiling tube when the experimenter
i) Breaths in:
Boiling tube, A
Boiling tube, B
b) Breaths out:
Boiling tube, A
Boiling tube, B
c. What conclusions can you draw from the results of this experiment
d. What is the purpose of the boiling tube A?
Date posted:
September 16, 2019
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Answers (1)
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A patient whose blood group is A died shortly after receiving blood from a person of blood group B. Explain the possible cause of the...
(Solved)
A patient whose blood group is A died shortly after receiving blood from a person of blood group B. Explain the possible cause of the death of the patient.
Date posted:
September 16, 2019
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Answers (1)
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State two ways in which human body is naturally protected against harmful bacteria.
(Solved)
State two ways in which human body is naturally protected against harmful bacteria.
Date posted:
September 16, 2019
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Answers (1)
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The figure below shows feet of various birds. Study the diagram and answer the questions that follow.
(Solved)
The figure below shows feet of various birds. Study the diagram and answer the questions that follow.
(a) Giving a reason, state the type of food eaten by Bird E.
Food eaten:
Reason:
(b) Name the habitat of bird D and give a reason for your answer.
Habitat:
Reason:
(c) Identify the type of structures shown by the feet above and give a reason for your answer.
Type of structure:
Reason:
(d) State the type of evolution shown by the structures.
Date posted:
September 16, 2019
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Answers (1)
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An experiment was carried out to determine the growth rates of bamboo and a variety of maize plants in two adjacent plots.The average height and...
(Solved)
An experiment was carried out to determine the growth rates of bamboo and a variety of maize plants in two adjacent plots.The average height and average dry weight of plants from the two populations were determined over a period of twenty weeks. The data is as shown in the table below.
(a) Between which two weeks did the greatest increase in weight occur in:
(i) Bamboo plants:
(ii) Maize plants:
(b) (i) Which of the two types of plants had a higher productivity by the end of the experiment?
(ii) Give a reason for your answer in (b) (i) above.
(c) Between weeks 14 and 18, the average height of the maize plants remained constant while average dry weight increased.Explain this observation.
(d) Suggest how the change in the average dry weight bamboo and maize plants would have been at week 22 if the experiment was continued.
(e) Why was it appropriate for this experiment to use:
(i) Dry weight instead of fresh weight.
(ii) Weight and height.
(f) Describe how the average height and weight of the plants were determined in this experiment.
(i) Average height.
(ii) Average dry weight.
(g) Give a reason why secondary thickening does not occur in bamboo and maize plants.
Date posted:
September 16, 2019
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Answers (1)
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The equation below represents a certain physiological process. Study it and answer the questions below.
(Solved)
The equation below represents a certain physiological process. Study it and answer the questions below.
(i) Name the above process.
(ii) Give two reasons for question (i) above.
(iii) Calculate the respiratory quotient of the compound that was as the substrate.
(iv) Identify the substrate being respired in the above equation.
(v) State one importance of this process to living organisms.
(vi) Name the organelle where the above process takes place in animal cells.
Date posted:
September 16, 2019
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Answers (1)
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A man with normal skin colour got married to a woman with normal skin colour. They gave birth to three children; one of them an...
(Solved)
A man with normal skin colour got married to a woman with normal skin colour. They gave birth to three children; one of them an albino.
(a) Identify the probable genotype of the parents using letter (A) for normal gene and (a) for defective gene.
Man:
Woman:
(b) Using a genetic cross; show the genotypes of the offspring.
(c) Give the phenotypic ratio of the offsprings.
Date posted:
September 16, 2019
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Answers (1)
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Name the source of hydrochloric acid in the mammalian heart.
(Solved)
Name the source of hydrochloric acid in the mammalian heart.
Date posted:
September 16, 2019
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Answers (1)
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The chemical equation below represents a physiological process that takes place in living organisms.
(Solved)
The chemical equation below represents a physiological process that takes place in living organisms.
Name:
(i) The process R:
(ii) Substance Q:
Date posted:
September 16, 2019
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Answers (1)
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Explain why tracheids are not efficient in transporting water up the plant.
(Solved)
Explain why tracheids are not efficient in transporting water up the plant.
Date posted:
September 16, 2019
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Answers (1)
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The figures below represent mammalian tissue as seen under a light microscope.
(Solved)
The figures below represent mammalian tissue as seen under a light microscope.
(a) Identify the tissue
(b) Name the cells represented by R,S and T
(c) State the function of structure S and R.
(d) Explain two adaptations of structure T to its function.
(e) Name the hereditary condition a person with structure T is suffering from.
Date posted:
September 16, 2019
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Answers (1)
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State the role of carnassial teeth in a lion..
(Solved)
State the role of carnassial teeth in a lion..
Date posted:
September 16, 2019
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Answers (1)
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The diagram below shows two potted plants on a laboratory bench near a window.
(Solved)
The diagram below shows two potted plants on a laboratory bench near a window.
a) State one observable difference between the plants I and II.
b) State the importance of the process that is seen in plant I.
c) Explain the process that resulted to appearance of the leaves as in plant I above.
d) Suppose a cell from a leaf of each of the plants I and II is mounted and observed under a microscope. Draw a diagram of a cell from each of the plants leaves.
Date posted:
September 16, 2019
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Answers (1)
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The diagram below represents microvilli on epithelial cells
(Solved)
The diagram below represents microvilli on epithelial cells
(a) Name the parts A and C
(b) Name two parts in the human body where the above epithelial cells are found.
Date posted:
September 16, 2019
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Answers (1)
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During an ecological study of a lake, a group of students recorded the following observations.
(Solved)
During an ecological study of a lake, a group of students recorded the following observations.
(i) Planktonic crustaceans feed on planktonic algae;
(ii) Small fish feed on planktonic crustaceans, worms and insect larvae;
(iii) Worms feed on insect larvae;
(iv) A bird species feeds on small fish, planktonic crustaceans, worms and large fish;
(v) Insect larvae feed on planktonic algae;
(vi) Large fish feed on small fish.
(a) From this record of observations, construct a food web.
(b) From the food web, isolate and write down a food chain that ends with:-
(i) Bird species as a secondary consumer.
(ii) Large fish as a tertiary consumer.
(c) The biomass of the producers in the lake was found to be greater than that of primary consumers. Explain this observation.
(d) Using the food web, identify three pairs of organisms that compete for food in the lake and for each case, name the food being competed for.
(e) (i) State three ways by which human beings may interfere with this lake ecosystem.
(i) Explain how each of the ways stated in (e) (i) above may affect life in the lake.
Date posted:
September 16, 2019
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Answers (1)
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You are provided with photographs of animals. Study the photographs and the dichotomous key below to enable you identify the taxonomic group to which each...
(Solved)
You are provided with photographs of animals. Study the photographs and the dichotomous key below to enable you identify the taxonomic group to which each animal belongs.
KEY
1. a) Jointed legs present ………………………………………………………………go to 2
b) Jointed legs absent………………………………………………………………..go to 7
2. a) Three pairs of legs ………………………………………………………………..go to 3
b) More than 3 pairs of legs………………………………………………………….go to 5
3. a) Wings present …………………………………………………………………….go to 4
b) Wings absent………………………………………………………………………Anoplura
4. a) One pair of wings…………………………………………………………………Diptera
b) Two pairs of wings……………………………………………………………Hymenoptera
5. a) Four pairs of legs ………………………………………………………………… Arachnida
b) More than ten pairs of legs ………………………………………………………. go to 6
6. a) One pair of legs in each body segment…………………………………………… Chilopoda
b) Two pairs of legs in each body segment ………………………………………… Diplopoda
7. a) Body partially enclosed in a shell………………………………………………… Mollusca
b) Body surface has spiny projection…………………………………………….Echinodermata
a) Using the key, identify the following organisms to their taxonomic groups. In each case, give the sequence of steps which you followed in identifying them.
b) i) Using observable features only, state the class to which the animal labeled A and B on the photographs above belong.State two observable features on B, that enabled you to arrive at that answer in (b) (i) above.
Date posted:
September 13, 2019
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Answers (1)
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A student divided a small air tight box into two chambers with wire mesh. In one chamber he kept a number of rats and in...
(Solved)
A student divided a small air tight box into two chambers with wire mesh. In one chamber he kept a number of rats and in the other a number of potted plants. What was likely to happen if the box was placed in the dark for two hours? Explain your answer.
Date posted:
September 13, 2019
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Answers (1)