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A human gene which is Y-linked controls premature baldness. One allele leads to normal hair pattern while the other produces premature baldness

answered Jul 8, 2021 in Biology Form 4

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The diagram below illustrates an experimental set up to compare relative amounts of a gas in inhaled air and exhaled air.

answered Jul 8, 2021 in Biology Form 2

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State two functions of the cuticle in insects.

answered Jul 8, 2021 in Biology Form 3

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State two adaptations that enable birds to fly.

answered Jul 8, 2021 in Biology Form 4

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The diagram below illustrates the variation in atmospheric temperature in the course of a day and the body temperature of two animals A and B. Study it and answer the questions that follow.

answered Jul 8, 2021 in Biology Form 3

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A form four student was found to have blood group AB+.

answered Jul 8, 2021 in Biology Form 2

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Explain comparative serology as an evidence of evolution.

answered Jul 8, 2021 in Biology Form 4

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The following diagrams represent different animal structures.

answered Jul 8, 2021 in Biology Form 4

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State the functions of lymph nodes.

answered Jul 8, 2021 in Biology Form 1

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State two ways in which the skeletal muscle fibres are adapted to their function.

answered Jul 8, 2021 in Biology Form 4

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The diagram below shows section through the flower of a certain plant.

answered Jul 8, 2021 in Biology Form 3

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Wet cotton wool was put in two flasks M and N. Soaked seeds are added to M and an equal number of boiled seeds to N. Both groups of seeds were first soaked in sodium hypochlorite solution before being put in the flasks. The flasks were securely corked and left in the same conditions of light and temperature for ten days. The cork from each flask was removed and each tilted over a test-tube of calcium hydroxide solution as shown in T.

answered Jul 8, 2021 in Biology Form 1

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Short-horned grasshopper moults five times before reaching adult size. Draw the kind of growth curve you would expect for the grasshopper if the changes in its length are plotted against time.

answered Jul 8, 2021 in Biology Form 3

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The figure below shows the change in the concentration of various substances in a river following the discharge of untreated sewage into it.

answered Jul 8, 2021 in Biology Form 3

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A form four student was walking around the school compound and saw leaves from nandi flame tree on the ground.

answered Jul 8, 2021 in Biology Form 3

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Two farmers prepared two ponds Q and R and introduced equal number of fish in each pond. The fish in pond Q died within seven days of being introduced into the pond. Those of pond R survived. On close examination of the ponds, it was found that one of the ponds was full of algae and the other had no algae.

answered Jul 8, 2021 in Biology Form 2

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State two functions of calcium in the human body.

answered Jul 8, 2021 in Biology Form 1

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The figure below represents a cell organelle found in the somatic cell of a certain organism.

answered Jul 8, 2021 in Biology Form 1

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A plastic container fill of water was stoppered using a piece of stem obtained from a young maize plant whose bark had been peeled off. The next day it was noted that the stopper closed the container very tightly. Explain.

answered Jul 8, 2021 in Biology Form 1

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A layer of glycerine was applied on upper surface of a freshwater floating plant that had been kept in the dark for 24 hours. The plant was left undisturbed in bright light. After three hours test for starch carried out on the leaves produced a brown colour of iodine solution. Account for the observation.

answered Jul 8, 2021 in Biology Form 1

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