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Which plant growth hormone induces parthenocapy?
Date posted:
May 28, 2019
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A student in form 3 caught an organism which had the following characteristics.
(i) Body divided into two parts
(ii) Simple eyes
(iii) Eight legs
Classify the organism up to the class level
Date posted:
May 28, 2019
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Explain each of the following:
(a) A mature plant cell does not lose its shape even after losing water
(b) Xylem vessels do not collapse even when they are not conducting water
Date posted:
May 28, 2019
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(i)Identify the mode of feeding of the animal whose dental formula is shown below
(ii) Give reasons for your answer in (i) above
Date posted:
May 28, 2019
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The diagram below represents a cell as seen under an electron microscope.
a) Identify the parts labeled A and D.
b) State the function of the structures found on the part labeled D.
Date posted:
May 28, 2019
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An experiment was carried out to investigate transpiration and absorption of water in sunflower plants in their natural environment with adequate supply of water. The amount of water was determined in two hour intervals. The results are shown in the table below.
(a) Using the same axes, plot graphs to show transpiration and absorption of water in grammes against time of the day.
(b) At what time of the day was the amount of water the same for transpiration and absorption.
(c) Account for the shape of the graph of
(i) Transpiration
(ii) Absorption
(d) What would happen to transpiration and absorption of water if the experiment was continued till 0050 hours.
(e) Name two factors that may affect transpiration and absorption at any given time.
(f) Explain how the factors you named in (e) above affect transpiration.
Date posted:
May 28, 2019
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A portion of a nucleic acid is shown below;
a) Name the nucleic acid to which the portion belongs. Give a reason.
b) Write down the sequence of bases of a complimentary strand to the one above.
Date posted:
May 28, 2019
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Name two renal diseases.
Date posted:
May 27, 2019
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The diagram below illustrate an experiment to demonstrate some aspects of respiration in a potted plant.
(a) Name and state the role of the chemical compound labeled A
Chemical compound
Role played
(b) What aspect of respiration is being demonstrated?
(c) Name the reagents in set up B and D.
(d) What would be the results in set up B and D after the experiment has run for some time.
Set up B
Set up D
(e) State the importance of covering the bell jar in set up C with a black polythene bag.
(f) Why was it necessary to enclose the pot with a polythene bag.
Date posted:
May 27, 2019
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Explain why it is difficult for scientist to make a vaccine against plasmodium which causes malaria.
Date posted:
May 27, 2019
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Name the hormone involved in development of male secondary sexual characteristics.
Date posted:
May 27, 2019
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Name the hormone involved in Milk production
Date posted:
May 27, 2019
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State two adaptations of the oviduct in female reproductive system.
Date posted:
May 27, 2019
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Explain why cell membrane is semi-permeable.
Date posted:
May 27, 2019
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Name two main mineral ions required for transmission of a nerve impulse
Date posted:
May 27, 2019
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Name the cell organelles which would be abundant in
(a) Sperm cell
(b) Pancreas
Date posted:
May 27, 2019
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State the importance of Salts glands in halophytes.
Date posted:
May 27, 2019
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What is the importance of carriers in active transport.
Date posted:
May 27, 2019
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The diagram below shows the structure of a monocotyledonous seed
(a) Name the parts B and D
(b) Name the parts that would stain blue black with iodine solution.
Date posted:
May 27, 2019
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Define the following terms in reference to fish locomotion
(a) Pitching
(b) Rolling
(c) Yawing
Date posted:
May 27, 2019
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Name a disadvantageous gene that is dominant
Date posted:
May 27, 2019
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State three functions of adrenaline released when a person is faced with an emergency situation.
Date posted:
May 27, 2019
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Name the basic functional unit of a kidney.
Date posted:
May 27, 2019
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The figure below shows feet of various birds. Study the diagram and answer the questions that follow.
(i) Name the type of evolution represented by the diagrams.
(ii) Using Darwin’s theory of evolution, explain how the feet of bird E would have evolved.
(iii) Explain how Larmack could have explained the evolution of feet of bird C.
Date posted:
May 27, 2019
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How are respiratory gases, oxygen and carbon (IV) oxide transported to and from tissues in mammals?
Date posted:
May 27, 2019
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Name the process in the human body that ensures that haemolysis of red blood cells is prevented.
Date posted:
May 27, 2019
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What term is used to describe the solution with equal solute concentration as that of the cells?
Date posted:
May 27, 2019
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An experiment was carried out in which red blood cells were put in salt solutions of different concentrations. The table below shows the percentage of cells which were destroyed by haemolysis in different salt concentration.
(a) Draw a graph of percentage of red blood cells haemolysed against salt concentration.
(b) Explain haemolysis of red blood cells.
(c) From the graph, state:
(i) the salt concentration at which 50% red blood cells were haemolysed.
(ii) the highest salt concentration when the largest number of red blood cells were haemolysed.
(d) (i) Suggest the normal salt concentration in the blood of the mammal from which the red blood cells were obtained.
(ii) Give a reason for your answer in (d) (i) above.
Date posted:
May 27, 2019
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A pea plant with smooth seeds was crossed with one with wrinkled seeds. The gene for smooth seeds is dorminant over that for wrinkled seeds. Use letter R to represent the dorminant.
(a) State the genotype of the parents if the plant with smooth seeds was heterozygous.
(b) State the gametes produced by the smooth seeds and wrinkled seeds parents.
(c) State the genotype and phenotype of F1 generation. Show your working.
Date posted:
May 27, 2019
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The table below shows the number of Leopards and Impala in a grassland park over a period of six years.
(a) (i) What is the average number of Impala in the park during the six years.
(ii) Account for the decrease in the number of leopards between the 4th and 6th year?
(b) Identify the trophic level occupied by
(i) Leopards
(ii) Tick feeding on the leopard.
(c) The two pyramids shown were obtained in the park.
Identify each type of pyramid.
Date posted:
May 27, 2019