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Name the end products of the light stage in photosynthesis
Date posted:
May 1, 2017
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What is the role of the vascular bundles in plant nutrition?
Date posted:
May 1, 2017
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Name two mineral elements that are necessary in the synthesis of chlorophyll
Date posted:
May 1, 2017
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Name the: a) Material that strengthens xylem tissue.
b) Tissue that is removed when the bark of a dicotyledonous plant is ringed.
Date posted:
May 1, 2017
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State one effect of magnesium deficiency in green plants.
Date posted:
May 1, 2017
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State the role of light in photosynthesis
Date posted:
May 1, 2017
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a) Explain two roles of diffusion in human beings
b) What is meant by each of the following terms?
I) Crenated cell.
II) Flaccid cell.
Date posted:
May 1, 2017
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The diagram below shows a set-up for an experiment to demonstrate a certain physiology process.
a) What nature of solution is represented by 20% sugar solution?
b) Explain the observation made on the set-up after one hour.
Date posted:
April 29, 2017
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State two ways in which osmosis is significant to plants
Date posted:
April 29, 2017
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Describe how turgor pressure builds up.
Date posted:
April 29, 2017
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a) What is meant by term wilting?
b) Explain how an increase in temperature affects the rate of active transport.
Date posted:
April 29, 2017
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State three factors that affect the rate of diffusion
Date posted:
April 29, 2017
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In an investigation, a student extracted three pars of pawpaw cylinders using a cork borer. The cylinders were cut back to 50mm lenth and placed in a beaker containing a solution. The results after 40 minutes were as shown in the table below.
a) Account for the results in the table above
b) What would be suitable control set-up for the investigation?
Date posted:
April 29, 2017
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The diagram s below shows an experiment set-up to investigate a certain process in a plant tissue.
Explain the results obtained after 30 minutes
Date posted:
April 29, 2017
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Distinguish between haemolysis and plasmolysis.
Date posted:
April 29, 2017
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Name the type of movement that occurs within a plant cell.
Date posted:
April 29, 2017
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a) Distinguish between diffusion and active transport
b) State one role that is played by osmosis in
i) Plants
ii) Animals
Date posted:
April 29, 2017
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The diagram below show a red blood cell that was subjected to a certain treatment
Account for shape of the cell at the end of the experiment
Date posted:
April 28, 2017
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Distinguish between diffusion and osmosis.
Date posted:
April 28, 2017
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An experiment was set up as shown below
The set up was left for 30 minutes.
a) State the expected results.
b) Explain your answer in (a) above
Date posted:
April 28, 2017
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State the importance of osmosis in plant
Date posted:
April 28, 2017
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Why is oxygen important in the process of active transport in cells?
Date posted:
April 28, 2017
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Explain what would happen to a red blood cells if they are placed in a concentrated salt solution
Date posted:
April 28, 2017
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State the functions of the following parts of a light microscope.
a) Objective lens
b) Diaphragm
Date posted:
April 28, 2017
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a) State two advantages of using a coverslip when preparing a specimen for observation under a light microscope.
b) How is the low power objective lens manipulated to focus a specimen for observation under a light microscope?
Date posted:
April 28, 2017
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A student drew a 6 cm long diagram of a plant flower. If the actual length of the flower was 12 cm, calculate the magnification of the drawing made by the student. Show your working
Date posted:
April 28, 2017
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State one way in which each of the following is structurally adapted to its function:
a) neurone;
b) Mitochndrion.
Date posted:
April 28, 2017
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Name the organelle that is involved in each of the following
a) Manufacture of lipids
b) Formation of lysosomes
Date posted:
April 28, 2017
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a) Name the part of a light microscope used to bring an image of a specimen into sharp focus.
b) Why is it recommended to keep the stage of the microscope dry?
Date posted:
April 28, 2017
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The figure below is a fine structure of a generalized animal cell as seen under an electron microscope.
a) Name the parts labeled A and B.
b) How the is structure labeled B adapted to its function?
Date posted:
April 28, 2017