50 Most Important NEET PYQs of Chapter 14: Respiration in Plants – Part 1 (Q1–25)

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🧬 50 Most Important NEET PYQs of Chapter 14: Respiration in Plants – Part 1 (Q1–25)

By: neetpyqall

Welcome to another power-packed NEET preparation blog! In this post, we’re diving deep into the first 25 most important previous year questions from Chapter 14 – Respiration in Plants. Each question is followed by a detailed solution to boost your clarity and confidence.

1. In which of the following, the first step of aerobic respiration occurs?

A) Cytoplasm
B) Mitochondria
C) Chloroplast
D) Ribosome
✅ Answer: A) Cytoplasm
🧠 Explanation: The first step of aerobic respiration is glycolysis, which takes place in the cytoplasm.

2. The link between glycolysis and Krebs cycle is:

A) Pyruvic acid
B) Acetyl CoA
C) Oxaloacetic acid
D) Lactic acid
✅ Answer: B) Acetyl CoA
🧠 Explanation: Pyruvate is converted into Acetyl CoA before entering the Krebs cycle.

3. End product of glycolysis is:

A) Glucose
B) Pyruvic acid
C) Acetyl CoA
D) Citric acid
✅ Answer: B) Pyruvic acid
🧠 Explanation: Glycolysis breaks down glucose into two molecules of pyruvic acid.

4. Which enzyme is involved in the conversion of glucose to glucose-6-phosphate?

A) Hexokinase
B) Phosphoglucoisomerase
C) Aldolase
D) Enolase
✅ Answer: A) Hexokinase
🧠 Explanation: Hexokinase catalyzes the phosphorylation of glucose to glucose-6-phosphate using ATP.

5. Which one produces maximum ATP?

A) Glycolysis
B) Krebs cycle
C) Oxidative phosphorylation
D) Fermentation
✅ Answer: C) Oxidative phosphorylation
🧠 Explanation: The majority of ATP is produced during oxidative phosphorylation through the electron transport chain.

6. In anaerobic respiration in muscles, pyruvic acid is converted into:

A) Ethanol
B) Acetyl CoA
C) Lactic acid
D) Glucose
✅ Answer: C) Lactic acid
🧠 Explanation: In the absence of oxygen, muscle cells convert pyruvic acid to lactic acid.

7. Where does the Krebs cycle occur?

A) Cytoplasm
B) Ribosomes
C) Nucleus
D) Mitochondrial matrix
✅ Answer: D) Mitochondrial matrix
🧠 Explanation: All reactions of the Krebs cycle take place in the matrix of mitochondria.

8. How many ATP are generated by the complete oxidation of one glucose molecule?

A) 2
B) 8
C) 36
D) 18
✅ Answer: C) 36
🧠 Explanation: A complete aerobic oxidation of glucose yields a net of 36 ATP in most cells.

9. The enzyme alcohol dehydrogenase is active during:

A) Aerobic respiration
B) Anaerobic respiration in yeast
C) Anaerobic respiration in muscles
D) Photosynthesis
✅ Answer: B) Anaerobic respiration in yeast
🧠 Explanation: Alcohol dehydrogenase helps convert acetaldehyde to ethanol during fermentation in yeast.

10. Common intermediate between carbohydrate, protein, and fat metabolism is:

A) Pyruvate
B) Acetyl CoA
C) Glucose
D) Glycerol
✅ Answer: B) Acetyl CoA
🧠 Explanation: Acetyl CoA is a central molecule entering the Krebs cycle from all macronutrient metabolism.

11. ATP is produced at which stage in glycolysis?

A) Hexokinase step
B) Phosphoglycerate kinase step
C) Enolase step
D) Isomerization step
✅ Answer: B) Phosphoglycerate kinase step
🧠 Explanation: This step generates ATP via substrate-level phosphorylation.

12. How many ATPs are formed during the conversion of 1 glucose to 2 pyruvic acid?

A) 2
B) 4
C) 6
D) 8
✅ Answer: B) 4
🧠 Explanation: 4 ATPs are formed, but net gain is 2 ATP because 2 are used up.

13. In plants, anaerobic respiration leads to the formation of:

A) CO₂ and H₂O
B) CO₂ and ethanol
C) CO₂ and lactic acid
D) CO₂ and acetic acid
✅ Answer: B) CO₂ and ethanol
🧠 Explanation: Plant cells and yeast form ethanol and CO₂ in anaerobic conditions.

14. Which of the following does not participate in electron transport system?

A) Cytochrome c
B) Ubiquinone
C) FAD
D) Acetyl CoA
✅ Answer: D) Acetyl CoA
🧠 Explanation: Acetyl CoA enters Krebs cycle but does not directly participate in the ETS.

15. First stable compound in Krebs cycle is:

A) Pyruvate
B) Acetyl CoA
C) Citric acid
D) Malic acid
✅ Answer: C) Citric acid
🧠 Explanation: Citric acid is the first stable compound formed when Acetyl CoA combines with oxaloacetate.

16. Final hydrogen acceptor in aerobic respiration is:

A) NAD⁺
B) FAD
C) Oxygen
D) Cytochrome
✅ Answer: C) Oxygen
🧠 Explanation: Oxygen acts as the terminal electron acceptor in aerobic respiration forming water.

17. Number of ATP molecules produced by oxidative phosphorylation from one NADH is:

A) 1
B) 2
C) 3
D) 4
✅ Answer: C) 3
🧠 Explanation: One NADH contributes approximately 3 ATP through the electron transport chain.

18. Respiratory Quotient (RQ) of glucose is:

A) <1
B) >1
C) 1
D) Zero
✅ Answer: C) 1
🧠 Explanation: RQ = CO₂ evolved / O₂ consumed = 6/6 = 1 for carbohydrates like glucose.

19. During fermentation, one molecule of glucose yields:

A) 2 ATP
B) 4 ATP
C) 36 ATP
D) 38 ATP
✅ Answer: A) 2 ATP
🧠 Explanation: Only 2 ATPs are formed during glycolysis, the only energy-yielding step in fermentation.

20. Which one is the first step in cellular respiration?

A) Electron transport
B) Glycolysis
C) Krebs cycle
D) Chemiosmosis
✅ Answer: B) Glycolysis
🧠 Explanation: Glycolysis is the initial step and occurs in the cytoplasm.

21. Respiratory quotient is highest for:

A) Carbohydrates
B) Proteins
C) Organic acids
D) Fats
✅ Answer: C) Organic acids
🧠 Explanation: Organic acids have RQ > 1 due to greater CO₂ output than O₂ consumption.

22. Enzyme catalyzing conversion of pyruvate to Acetyl CoA:

A) Pyruvate kinase
B) Pyruvate dehydrogenase
C) Lactate dehydrogenase
D) Alcohol dehydrogenase
✅ Answer: B) Pyruvate dehydrogenase
🧠 Explanation: Pyruvate dehydrogenase complex catalyzes this crucial linking step.

23. Number of ATPs produced by one FADH₂ is:

A) 1
B) 2
C) 3
D) 4
✅ Answer: B) 2
🧠 Explanation: FADH₂ enters the ETC at a lower energy level, yielding 2 ATPs.

24. In plants, most of the energy released during respiration is:

A) Stored in DNA
B) Lost as heat
C) Stored as ATP
D) Used in glycolysis
✅ Answer: C) Stored as ATP
🧠 Explanation: ATP is the primary energy currency generated and used by plant cells.

25. Which of the following is not formed in glycolysis?

A) NADH
B) ATP
C) Pyruvate
D) FADH₂
✅ Answer: D) FADH₂
🧠 Explanation: FADH₂ is not formed during glycolysis; it is formed in the Krebs cycle.

✅ Stay tuned for Part 2 (Q26–50) of this chapter, where we complete the most important PYQs with explanations.

📌 For daily NEET bio prep content, follow: 🔗 neetpyqall.blogspot.com
🔗 biologyatease1.blogspot.com


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