Question

All the grain legumes have a high rate of respiration because of

• A. Carbon Mechanism
• B. More vegetative growth
• C. Semi spreading
• D. Pod position

Hint:

Grain legumes expend substantial metabolic energy in pod development, nitrogen fixation, and protein synthesis.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Legume crops have distinct physiological and morphological characteristics affecting gas exchange and respiratory energy expenditure.

Step 2: Detailed Explanation:
Grain legumes position their pods along the stem nodes within or below the canopy where photosynthetic light interception by pod walls is limited, while respiratory maintenance demands for nitrogen-rich seed filling are high.
In addition, high metabolic costs associated with symbiotic nitrogen fixation and protein biosynthesis drive elevated dark respiration.

Step 3: Final Answer:
Hence, the characteristic is related to pod position.