C3 and C4 pathways, photorespiration
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See all →- Which of the following statements about RuBisCO is true? Answer: 4. It catalyzes the carboxylation of RuBP. Key idea: RuBisCO is the carboxylating enzyme of the Calvin cycle. It catalyses carboxyla... 1
- Given below are two statements:Statement I : In C_3 plants, some O_2 binds to 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 photorespira… Answer: 4. Statement I is true but Statement II is false Key idea: O₂ competes with CO₂ for RuBisCO in C₃ plants, but C₄ plants avoid photor... 1
- Which of the following are required for the dark reaction of photosynthesis?A. LightB. ChlorophyllC. CO_2D. ATPE. NADPHChoose the correct answer from the options given below: Answer: 4. C, D and E only Key idea: the dark (biosynthetic) reaction uses the ATP and NADPH made in the light reaction, together with CO₂ .... 1
- How many molecules of ATP and NADPH are required for every molecule of CO_2 fixed in the Calvin cycle? Answer: 1. 3 molecules of ATP and 2 molecules of NADPH Key idea: fixing one CO₂ in the Calvin cycle costs 3 ATP and 2 NADPH. One CO₂ joins R... 1
- How many ATP and NADPH_2 are required for the synthesis of one molecule of Glucose during Calvin cycle? Answer: 3. 18 ATP and 12 NADPH ₂ Key idea: One CO₂ fixed in the Calvin cycle needs 3 ATP and 2 NADPH. Glucose has 6 carbons, so 6 turns are... 1
- What is the role of large bundle shealth cells found around the vascular bundles in C_4 plants ? Answer: 3. To increase the number of chloroplast for the operation of Calvin cycle The large bundle sheath cells of C₄ plants hold many chlo... 1