Back to Directory
NEET BIOLOGYMedium

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 .
Practice Mode Available

Master this Topic on Sushrut

Join thousands of students and practice with AI-generated mock tests.

Get Started
Solved: BIOLOGY Question for NEET | Sushrut