Photosynthesis - HKALE 1990 Biology Paper I 3 Explain why...

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HKALE 1990 Biology Paper I 3. Explain why the following equation is an unsatisfactory summary of the process of photosynthesis : (6 marks) HKALE 1990 Biology Paper II 9. Discuss the biological significance of the "greenhouse effect" to plant communities. (20 marks) HKALE 1991 Biology Paper I 2. Outline the role of the following elements in the nutrition of green plants. What are the effects of their deficiency on plant growth ? (a) calcium (b) nitrogen 6CO 2 + 6H 2 O light chlorophyll C 6 H 12 O 6 + 6O 2
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HKALE 1991 Biology Paper I 7. Why are leaves usually thin and flat ? Name ONE environment where there are many exceptions and explain why this is so. HKALE 1991 Biology Paper II 8. Describe the ways in which light affects the growth and development of plants. (20 marks)
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HKALE 1992 Biology Paper I 11. "Maximum photosynthesis' refer to the highest possible rate of photosynthesis attainable by a plant species under optimal conditions. The graph below shows how the light intensity affects the rates of photosynthesis of different plant types (measured as percentages of their maximum photosynthesis) : (a) Different plant types may have different ABSOLUTE values of 'maximum photosynthesis'. Suggest one reason for such differences. (b) Describe and explain the effect of light intensity on photosynthesis of the tree species A. (c) With reference to the natural habitat of the green algae, explain how they differ from tree species A in the following : (i) the optimal light intensity for photosynthesis (ii) the effect of a light intensity of 1 kJ m-2 min-1 on photosynthesis marks) (d) It is known that tree species B will not grow well when planted together with tree species A. Suggest a possible explanation with reference to the graph above.
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HKALE 1993 Biology Paper II 3. (a) The leaf is an important organ for light absorption and gaseous exchange. Explain how the structures of a leaf are adapted to the above functions. marks) (b) Give the chemical equation for photosynthesis. From the equation, what changes in the substances taken up and produced might be used to measure the rate of photosynthesis ? (3 marks) (c) What is meant by "limiting factor" ? With the aid of labelled curves, explain how and why carbon dioxide can be a limiting factor to photosynthesis. marks) HKALE 1994 Biology Paper II (b) Contrast the "light reaction" with the "dark reaction" in photosynthesis . marks)
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(c) Using an annotated flow chart, illustrate how energy flows and carbon is cycled through photoautotrophic and chemoheterotrophic organisms. Indicate the roles of respiration and photosynthesis in the flow chart. marks) HKALE 1995 Biology Paper I 10. In a pot-growth experiment conducted in two controlled-environmental chambers, roots of pine seedlings at the same stage of growth were inoculated with a fungus. A control experiment was also carried out using uninoculated seedlings. The two chambers were set to provide CO2 at a concentration of 0.036% and 0.072% respectively. A number of seedlings were harvested after six weeks of growth. The fungus was found to infect the roots only and its extent of infection is shown in the table below. Several growth parameters of the pine
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