Question

Which of the following is not true for $C_{4}$ pathway?

• A. Overcomes loss due to photorespiration
• B. The $CO_{2}$ acceptor is a $C_{3}$ compound
• C. Inhibited by low $CO_{2}$ concentration
• D. Required more energy than the $C_{3}$ pathways for production of glucose

Answer 1

Answer: (C)

Difference between C3 and C4 plants:

• About eighty-five % of total plant life species are C3 and the most effective 15% are C4 vegetation.
• C3 plants are photosynthetic flora, while C4 are tropical plants.
• C3 vegetation is said as cool-season flora even as C4 plant life is said as warm-season flora.
• C3 plant life has a high rate of photorespiration, whereas C4 plants do not undergo photorespiration.
• The primary acceptor in C4 plants is a 3 carbon molecule.
• The C4 pathway is inhibited by low oxygen concentration.
• C3 carries out photosynthesis most effective while stomata are open, however, C4 can perform photosynthesis even if stomata are closed.
• C3 plants need 12 NADPH and 18 ATP for glucose synthesis while C4 flora wants 12 NADPH and 30 ATP. This means C4 plants require 12 additional ATP as compared to C3 plants.