Photosynthesis - Light reaction.30 Dark reaction.30...

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Chapter 37 / Exercise 013
Biology
Martin/Solomon
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“Light reaction”....................................................................................................30“Dark reaction”.............................................................................................................30
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Biology
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Chapter 37 / Exercise 013
Biology
Martin/Solomon
Expert Verified
QuestionsHKALE 1990 Biology Paper IHKALE 1990 Biology Paper I3.Explain why the following equation is an unsatisfactory summary of the process of photosynthesis :6CO2+6H2OlightchlorophyllC6H12O6+6O2(6 marks)Suggested Solution…
HKALE 1990 Biology Paper IIHKALE 1990 Biology Paper II9.Discuss the biological significance of the "greenhouse effect" to plant communities.(20 marks)Suggested Solution…
HKALE 1991 Biology Paper IHKALE 1991 Biology Paper I2.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(4 marks)Suggested Solution…
HKALE 1991 Biology Paper IHKALE 1991 Biology Paper I7.Why are leaves usually thin and flat ? Name ONEenvironment where there are many exceptions and explain why this is so.(7 marks)Suggested Solution…
HKALE 1991 Biology Paper IIHKALE 1991 Biology Paper II8.Describe the ways in which light affects the growth and development of plants.(20 marks)Suggested Solution…
HKALE 1992 Biology Paper IHKALE 1992 Biology Paper I11."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.(2 marks)(b)Describe and explain the effect of light intensity on photosynthesis of the tree species A. (4 marks)(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(4 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. (3 marks)
(e)Diatoms, a type of phytoplankton, are known to exhibit daily vertical migration(moving down at noon). Given that normal light intensity at noon at the sea surfaceranges from 1.0 to 2.5 kJ m-2min-1, suggest a likely advantage of thisphenomenon. (3 marks)(f)Explain how two other environmental factors may affect the rate of photosynthesis of plants.(4 marks)Suggested Solution…
HKALE 1993 Biology Paper IIHKALE 1993 Biology Paper II

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