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Biology
Photosynthesis in Higher Plants
91 questions from 36 papers, each with its answer.
- 91 questions
- 36 papers
- 2.58% of Biology
Requirements of the Dark (Calvin Cycle) Reaction
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Which of the following are required for the dark reaction of photosynthesis? A. Light B. Chlorophyll C. $CO_2$ D. ATP E. NADPH Choose the correct answer from the options given below:The dark reaction (Calvin cycle) does not directly need light or chlorophyll. It requires $CO_2$ (to be fixed), and ATP and NADPH (produced in the light reaction) for the reduction of $CO_2$ to carbohydrates. So C, D and E only are required.
ATP and NADPH Requirement in Calvin Cycle
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How many molecules of ATP and NADPH are required for every molecule of $CO_2$ fixed in the Calvin cycle?In the Calvin cycle, the fixation of one molecule of $CO_2$ requires 3 molecules of ATP and 2 molecules of NADPH. (For one glucose molecule, i.e. 6 $CO_2$ fixed, 18 ATP and 12 NADPH are required.)
Photorespiration in C3 and C4 Plants
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Given below are two statements: Statement I: In $C_3$ Plants, some $O_2$ binds RuBisCO, hence $CO_2$ fixation is decreased. Statement II: In $C_4$ plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration. In the light of the above statements, choose the correct answer from the options given below:Statement I is true: in $C_3$ plants, RuBisCO can also bind $O_2$ (photorespiration), so $CO_2$ fixation decreases. Statement II is false: in $C_4$ plants, mesophyll cells lack RuBisCO, and photorespiration does not occur because $CO_2$ concentration is increased at the enzyme site in the bundle sheath cells. So Statement I is true but Statement II is false.
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