Topic: C3 and C4 pathways, photorespiration· Plant Physiology

The first stable product of CO_2 fixation in sorghum is :

1. Pyruvic acid

2. Oxaloacetic acid

3. Succinic acid

4. Phosphoglyceric acid

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Answer: 2. Oxaloacetic acid

Sorghum is a C4 plant. Its mesophyll cells fix CO\(_2\) with PEP carboxylase, so the first stable product is a 4-carbon acid, oxaloacetic acid (OAA).

Phosphoglyceric acid is the first stable product in C3 plants, and pyruvic and succinic acids are not first products.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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The first stable product of CO_2 fixation in sorghum is :

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