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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.

asked Jul 8, 2021 in Biology Form 1 by anonymous

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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.

asked Jul 8, 2021 in Biology Form 3 by anonymous

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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.

asked Jul 8, 2021 in Biology Form 3 by anonymous

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

asked Jul 8, 2021 in Biology Form 3 by anonymous

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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.

asked Jul 8, 2021 in Biology Form 2 by anonymous

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State two functions of calcium in the human body.

asked Jul 8, 2021 in Biology Form 1 by anonymous

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

asked Jul 8, 2021 in Biology Form 1 by anonymous

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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.

asked Jul 8, 2021 in Biology Form 1 by anonymous

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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.

asked Jul 8, 2021 in Biology Form 1 by anonymous

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The diagram below shows a part of the ear responsible for posture.

asked Jul 8, 2021 in Biology Form 4 by anonymous

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he diagram below shows a phenomenon which occurs during cell division.

asked Jul 8, 2021 in Biology Form 3 by anonymous

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Under certain conditions, the carbon(IV) oxide concentration in the blood of a mammal rises above normal level. State two physiological changes that occur in the body to lower the carbon(IV) oxide back to normal.

asked Jul 8, 2021 in Biology Form 2 by anonymous

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Some sorghum seeds were soaked in water for two days. They were then broken into small pieces and placed on the surface of agar containing starch. After two days, it was found that the agar no longer contained starch.

asked Jul 8, 2021 in Biology Form 1 by anonymous

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Use the diagram below to answer the questions that follow.

asked Jul 8, 2021 in Biology Form 1 by anonymous

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Name the branch of biology that deals with the of the following

asked Jul 8, 2021 in Biology Form 1 by anonymous

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Name the branch of biology that deals with the of the following

asked Jul 8, 2021 in Biology Form 1 by anonymous

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The figure below shows the cross-section of a diffusion cloud chamber used to detect radiation from radioactive sources.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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The graph below shows radioactive decay of iodine.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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A radioactive carbon-14 decays to nitrogen by beta particles as shown below.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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An X-ray operates at 30000V and the current through it is 2mA. Given that the charge of an electron is 1.6 x 10-19C, h = 6.63 x 10-34JS, speed of light, C = 3.0 x 108m/s, calculate:-

asked Jul 8, 2021 in Physics Form 4 by anonymous

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