Amphibolic Pathway — Respiration in plants NEET Questions 2026

Sample Questions — Amphibolic Pathway

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MCQ

Match the respiratory intermediates with their biosynthetic roles: A. Acetyl CoA B. α-Ketoglutarate C. Glyceraldehyde-3-phosphate D. Succinyl-CoA 1. Amino acid synthesis 2. Fatty acid synthesis 3. Heme synthesis 4. Entry point for glycolysis

A. A–4, B–1, C–3, D–2
B. A–3, B–2, C–1, D–4
C. A–2, B–3, C–4, D–1
D. A–2, B–1, C–4, D–3

✅ Correct Answer: D

Each intermediate can be diverted into a specific biosynthetic pathway.

MCQ

Which of the following best explains the dual role of the respiratory pathway?

A. It breaks down carbohydrates only
B. It stores ATP in mitochondria
C. It provides precursors for macromolecule synthesis and generates ATP
D. It only functions in anaerobic conditions and generates ATP

✅ Correct Answer: C

Dual function = energy generation + raw materials for biosynthesis.

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MCQ

Why do proteins enter the respiratory pathway only after deamination?

A. Amino acids can’t be broken down directly, all hydroxyl molecules are removed
B. Deamination makes them volatile
C. Proteins are directly converted to glucose
D. The amino group must be removed to form a usable carbon skeleton

✅ Correct Answer: D

After deamination, the carbon chain of amino acids enters the pathway as pyruvate, acetyl-CoA or TCA intermediates.

MCQ

Why must respiration be flexible in utilising different substrates like carbs, proteins, and fats?

A. Only plants use glucose
B. Cells do not always have glucose available
C. Oxygen is not required
D. Glucose is converted to DNA

✅ Correct Answer: B

Depending on nutritional status, different substrates are respired.

MCQ

Assertion (A): Fatty acids are directly broken into glyceraldehyde-3-phosphate during respiration. Reason (R): Both glycerol and fatty acids enter glycolysis directly.

A. Both A and R are true, and R is the correct explanation of A
B. Both A and R are true, but R is not the correct explanation of A
C. A is true, but R is false
D. A and R are false

✅ Correct Answer: C

Glycerol enters as PGAL, but fatty acids are first converted to acetyl-CoA (not PGAL).

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