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In maize the gene for the purple colour is dorminant for the gene for white colour. A purple colour was crossed with heterozygous plant. Using letter G to represent the gene for purple colour, work out the genotypic ratio of the offspring. Show your working.
Date posted:
September 13, 2019
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(a) Given a sample of urine, name one test you would carry out to determine if it was obtained from a person suffering from diabetes mellitus.
(b) What results are expected if one is diabetic?
Date posted:
September 13, 2019
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A goat weighing 20kg requires 216KJ while a mouse weighing 54gms requires 2830KJ per day. Explain.
Date posted:
September 13, 2019
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Mr. Juma has sued Serenity Hospital on grounds that their child was wrongly identified such that they got the wrong one.The child is blood group O. Mr. Juma is blood group AB while Mrs. Juma is heterozygous blood group A.
(a) Work out the possible blood group of their offsprings.
(b) Is Mr. Juma justified in his claims?
Date posted:
September 13, 2019
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The diagram below show single circulation of a fish.
(a) Write down the names of the parts labelled T,U and V.
(b) Explain the main disadvantage of this type of circulation.
(c) How is this type of circulation different from that found in man?
Date posted:
September 13, 2019
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A student collected a plant with the following features:
-Vascular bundles in the stem were scattered with no cambium.
-Fibrous root system.
Name the sub-division and the class to which the above plant belonged.
Sub-division
Class
Date posted:
September 13, 2019
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Name one waste product that is transported in the blood but not removed by the kidneys.
Date posted:
September 13, 2019
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Potato cylinders were weighed and kept in distilled water overnight. They were then reweighed.
(a) Calculate the average mass of the potato cylinders at the end of the experiments.(Show your working).
(b) Explain why the mass of the cylinders had increased.
Date posted:
September 13, 2019
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What is the importance of fixation in preparation of temporary slide?
Date posted:
September 13, 2019
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Explain why athletes practicing at high altitude zones have a higher number red blood cells than those at sea level.
Date posted:
September 13, 2019
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Explain why emulsification is not a chemical digestion.
Date posted:
September 13, 2019
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The diagram below shows a transverse section of a spinal cord.
Name the parts labelled A – D.
Date posted:
September 13, 2019
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Study the diagram below and answer the questions that follow:
(a) Identify the above apparatus.
(b) State the function of the above apparatus.
(c) Name an apparatus that can be used for catching insects on barks of trees or rock surfaces.
(d) Name the branch of Biology that deals with the study of birds.
Date posted:
September 13, 2019
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The diagram below indicates an organism that grows under shaded places with damp conditions. Study it and answer the questions that follow.
a) Name the division to which the specimen belongs.
b) Name the parts labeled Q, R and S.
c) State the functions of the parts labeled Q and S
d) Name the two body forms of the organism in its alteration of generations.
Date posted:
September 13, 2019
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The figure below shows blood of a person that was obtained after a test.
a) What condition is the person suffering from?
b) Why would such a person survive better in malaria prone areas than a normal person?
c) What is the disadvantage of acquiring such a condition?
Date posted:
September 13, 2019
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Name two kingdoms whose members reproduce by means of spores.
Date posted:
September 13, 2019
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The graph below represents growth of bacteria when cultured in a suitable media.
a) Name phases labeled A and C.
b) Account for the growth of the organism in phase (a)
Date posted:
September 13, 2019
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The diagram below shows a structure in flowering plants.State the function of each of the following parts labeled A and B after double fertilization.
Date posted:
September 13, 2019
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The wings of a bird and those of a housefly adapt the two organisms to a boreal habitat.
i) Give the evolutionary process that may have given rise to these structures.
ii) What name is given to such structures?
Date posted:
September 13, 2019
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State the fluids that provide cushion in the following organs
(a) Lungs
(b) Heart
(c) Knee
(d) Eye ball
Date posted:
September 11, 2019
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The diagram below illustrates a physiological process that occurs in the alimentary canal of man.
a) Name the process Q above
b) Explain the biological importance of the above process.
c) Name the substance that helps the process named (a) above.
Date posted:
September 11, 2019
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Using well labeled diagrams,describe the process of germination in a bean plant up to when the first stage foliage leaves become functional.
Date posted:
August 28, 2019
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The word equation below shows a biological process.
Water-------->Hydrogen atom + oxygen
(i) Name the process.
(ii) Where does the process named in (i) above take place?
(iii) State two conditions necessary for the process to occur.
Date posted:
August 22, 2019
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Giving a reason, state the organisms that are MOST closely related.
Date posted:
August 22, 2019
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The diagram below shows results of what happens to plant cell when placed in a certain solution.
(i) What was the nature of the solution in which the cell was placed?
(ii) Identify the force represented by the arrow X and explain how it develops.
Date posted:
August 22, 2019
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The photomicrograph below shows some structures of a cell. Study it and answer the questions that follow.
(a) Identify the organelles represented by:
S:
T:
(b) State the function of S
(c) Name an animal cell from which the photomicrograph above was obtained. Explain your answer.
(d) Work out the actual length of the structure T in micrometers.
Date posted:
August 14, 2019
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The diagram below shows how a seed changes after it is planted in a well-watered soil.
(a) Explain how the part labelled A straightens as shown in the last diagram.
(b) Other than storage of food for germination, state two functions of part B.
Date posted:
August 14, 2019
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A red cow was mated with a white bull. All F1 offspring were neither red nor white.Such individuals are said to be roan.
(a) Using letter R to represent the gene for red colour and W for the gene for white colour. Work out the genotypes of the F1 offspring.
(b) If the F1 offspring were selfed, state the phenotypic and genotypic ratios of the F2 offspring.
(c) State two importance of using plants in genetics experiments.
Date posted:
August 14, 2019
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A number of industries in Nairobi and Machakos counties have recently been found to direct their effluents into Nairobi River and Athi River respectively. State two effects of each of the following substances present in the industrial effluents.
(a) Lead.
(b) Oils.
Date posted:
August 13, 2019
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The diagram below shows a mammalian bone. Use it to answer questions that follow.
(a) With a reason, identify the bone.
Identity:
Reason:
(b) Identify each of the parts labelled:
A:
B:
(c) State the function of the part labelled C.
Date posted:
August 13, 2019