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NEET BIOLOGYPhotosynthesis in Higher Plants Medium

Question

Given below are two statements: Statement I: In C3 plants, some O2 binds to RuBisCO, hence CO2 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 option given below:

A

Both Statement I and Statement II are False

B

Statement I is True but Statement II is False

C

Statement I is False but Statement II is True

D

Both Statement I and Statement II are True

Step-by-Step Solution

According to the textbook:

  • Statement I is Correct: In C3 plants, RuBisCO has an affinity for both CO2 and O2. Some O2 binds to RuBisCO, and hence CO2 fixation is decreased, leading to a process called photorespiration .
  • Statement II is Incorrect: In C4 plants, photorespiration does not occur . Furthermore, the mesophyll cells of C4 plants lack the enzyme RuBisCO entirely , so they cannot perform photorespiration (which is catalysed by RuBisCO). The bundle sheath cells contain RuBisCO, but the C4 mechanism increases intracellular CO2 concentration there, ensuring the enzyme acts as a carboxylase and preventing photorespiration .

Exam Context & Concepts Covered

This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Photosynthesis in Higher Plants . Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

BIOLOGYPhotosynthesis in Higher Plants statementsstatementplantsrubiscofixation

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