Question

$C_4$ plants are more efficient in photosynthesis than $C_3$ plants due to

• A. higher leaf area
• B. presence of larger number of chloroplasts in the leaf cells
• C. presence of thin cuticle
• D. lower rate of photorespiration.

Answer 1

The Correct Option is D

Plants that utilize the Calvin cycle during the dark phase of photosynthesis are referred to as C₃ plants, while those employing the Hatch-Slack pathway during this phase are known as C₄ plants. C₄ plants have evolved a specialized anatomical structure in their leaves called Kranz anatomy, which aids in reducing or preventing photorespiration. In contrast, C₃ plants lack such anatomical adaptations in their leaves, leading to a higher rate of photorespiration, thus decreasing their photosynthetic efficiency.

Answer 2

\(C_4\) plants are more efficient than \(C_3\) due to their high rate of photosynthesis and reduced rate of photorespiration.