🌿 Respiration in Plants – NEET Notes & MCQs

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🔬 Introduction

Respiration in plants is a biochemical process of breaking down glucose to release energy. Unlike photosynthesis, it happens all the time, even in the absence of light. NEET frequently includes questions from aerobic and anaerobic respiration, glycolysis, and the Krebs cycle.


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⚡ Key Concepts Explained

1. Types of Respiration

Aerobic respiration – requires O₂

Anaerobic respiration – occurs without O₂


2. Glycolysis

Occurs in the cytoplasm

Converts glucose to pyruvate

Net gain: 2 ATP and 2 NADH


3. Link Reaction (Pyruvate to Acetyl CoA)

Takes place in the mitochondrial matrix


4. Krebs Cycle (Citric Acid Cycle)

Occurs in mitochondria

Produces: 3 NADH, 1 FADH₂, 1 ATP per Acetyl-CoA


5. Electron Transport System (ETS)

Located in inner mitochondrial membrane

Produces the maximum ATP (about 34 ATP)



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🧫 Anaerobic Respiration

In yeast: glucose → ethanol + CO₂ + energy

In muscles: glucose → lactic acid + energy



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🧠 Mnemonics

📝 "Good People Keep Every Activity Moving"
Glycolysis → Pyruvate → Krebs → ETS → ATP → Mitochondria


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📘 NEET Practice Questions

1. The end product of glycolysis is:
A. Acetyl-CoA
B. Glucose
C. Pyruvate
D. Lactic acid
✅ Answer: C. Pyruvate

2. Which step of respiration yields maximum ATP?
A. Glycolysis
B. Krebs cycle
C. ETS
D. Anaerobic fermentation
✅ Answer: C. ETS

3. In anaerobic respiration in yeast, the end products are:
A. Pyruvate and ATP
B. Lactic acid and CO₂
C. Ethanol and CO₂
D. Acetyl-CoA and NADH
✅ Answer: C. Ethanol and CO₂

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