Question

Given below are two statements:
Statement I: In C₃ plants, some O₂ binds to RuBisCO, hence CO, fixation is decreased.
Statement II: In C₄ 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:

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is true but Statement II is false
• D. Statement I is false but Statement II is true

Answer 1

The Correct Option is C

Statement I: In C₃ plants, photorespiration occurs when oxygen binds to RuBisCO, which reduces the efficiency of CO₂ fixation. This statement is true.

Statement II: In C₄ plants, photorespiration is minimized because CO₂ is first fixed in the mesophyll cells and then transported to bundle sheath cells. However, the statement that bundle sheath cells do not show any photorespiration is incorrect; it occurs at much lower levels compared to C₃ plants.

Thus, the correct answer is (3): Statement I is true, but Statement II is false.