Question

Select the adaptations that occur in C4 plants but not C3 plants. a. Light and carbon reactions occur in separate cells. b. ATP is used to move a three-carbon ferry molecule from bundle-sheath cells back to mesophyll cells. c. They require less water to live. d. Their rubisco is more likely to bind O2 than CO2. e. They have increased levels of photorespiration. f. Their stomata only open at night. g. These plants function better in the hot, sunny environments.

Answer 1

a. Light and carbon reactions occur in separate cells.

b. ATP is used to move a three-carbon ferry molecule from bundle-sheath cells back to mesophyll cells.

c. They require less water to live.

g. These plants function better in the hot, sunny environments.

Step-by-step explanation:

The plants which carry out C₄ pathway or Hatch and Slack pathway are called C₄ plants. Examples are maize, sugar cane, sorghum. They live in hot, dry or arid habitats. C₄ plants have dimorphic chloroplast. The chloroplast is in bundle sheath cells does not have grana and in the spongy mesophyll cells have chloroplasts with grana. So, light and carbon reactions occur in separate cells. C4 plants are more efficient in photosynthesis than the C₃ plants. There is no photorespiration in C₄ plants as Phospshoenol pyruvate (PEP) carboxylase enzyme.