Question Detail

BIO 101 BIO 101 Past Questions Objective Question
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Question

What differentiates C4 plants from C3 plants in terms of carbon fixation?
Options
A Use of different light wavelengths
B C4 plants initially fix CO2 into a four-carbon compound to avoid photorespiration
Correct Answer
C Only C4 plants undergo the Calvin cycle
D C3 plants utilize NADPH in mitochondria
Correct Answer

Option B is the correct answer.

Detailed Explanation

C4 plants have an additional carbon fixation step where CO2 is first fixed into a four-carbon compound (like oxaloacetate) in mesophyll cells before being released for the Calvin cycle in bundle-sheath cells. This spatial separation minimizes photorespiration.

Hint

The 'C4' refers to the number of carbons in the initial fixed compound.

Question Info

Course: BIO 101
Topic: BIO 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 700 of 2556
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