50 Most Important NEET PYQs of Chapter 14: Respiration in Plants – Part 2 (Q26–50)

-


🌱 50 Most Important NEET PYQs of Chapter 14: Respiration in Plants – Part 2 (Q26–50)

By: neetpyqall

Welcome back, NEET aspirants! In this Part 2 post, we continue solving the next 25 most important previous year questions (Q26–50) from Chapter 14 – Respiration in Plants, each with crisp, clear explanations to make your prep easier and smarter.

26. How many NADH molecules are formed in one turn of the Krebs cycle?

A) 1
B) 2
C) 3
D) 4
✅ Answer: C) 3
🧠 Explanation: In one turn of the Krebs cycle, 3 NADH molecules are produced.

27. Which step of cellular respiration is common in aerobic and anaerobic respiration?

A) Electron transport chain
B) Krebs cycle
C) Glycolysis
D) Alcoholic fermentation
✅ Answer: C) Glycolysis
🧠 Explanation: Glycolysis occurs in both types of respiration and takes place in the cytoplasm.

28. Net gain of ATP during anaerobic respiration of one glucose molecule is:

A) 2
B) 8
C) 36
D) 38
✅ Answer: A) 2
🧠 Explanation: Only glycolysis contributes to ATP production in anaerobic respiration, resulting in 2 ATP.

29. RQ of fats is:

A) 0.7
B) 1
C) 0.9
D) >1
✅ Answer: A) 0.7
🧠 Explanation: Fats consume more oxygen than CO₂ produced, hence RQ < 1 (≈ 0.7).

30. During cellular respiration, CO₂ is released in:

A) Glycolysis only
B) Krebs cycle only
C) Both glycolysis and Krebs cycle
D) Electron transport chain
✅ Answer: B) Krebs cycle only
🧠 Explanation: CO₂ is released during the decarboxylation steps of the Krebs cycle.

31. In mitochondrial ETC, electrons are finally passed to:

A) NAD⁺
B) FAD
C) Oxygen
D) Cytochrome oxidase
✅ Answer: C) Oxygen
🧠 Explanation: Oxygen acts as the final electron acceptor and forms water.

32. Which of the following is NOT involved in the conversion of pyruvate to ethanol?

A) Pyruvate decarboxylase
B) Alcohol dehydrogenase
C) CO₂
D) Oxygen
✅ Answer: D) Oxygen
🧠 Explanation: Ethanol formation occurs in anaerobic conditions without the need for oxygen.

33. Which compound enters the mitochondria from the cytoplasm during respiration?

A) Glucose
B) Pyruvate
C) Fructose
D) Oxaloacetate
✅ Answer: B) Pyruvate
🧠 Explanation: Pyruvate produced in glycolysis enters mitochondria for further oxidation.

34. Which part of the mitochondrion contains the electron transport system?

A) Outer membrane
B) Inner membrane
C) Matrix
D) Intermembrane space
✅ Answer: B) Inner membrane
🧠 Explanation: The ETC is embedded in the inner mitochondrial membrane.

35. ATP formation without electron transport chain is called:

A) Substrate-level phosphorylation
B) Oxidative phosphorylation
C) Photophosphorylation
D) Chemiosmosis
✅ Answer: A) Substrate-level phosphorylation
🧠 Explanation: ATP formed directly in a reaction step using a high-energy intermediate.

36. Site of ATP synthesis in mitochondria is:

A) Ribosome
B) Matrix
C) Inner membrane (cristae)
D) Outer membrane
✅ Answer: C) Inner membrane (cristae)
🧠 Explanation: ATP synthase enzymes are located on the inner membrane.

37. Which molecule links glycolysis to the Krebs cycle?

A) Acetyl CoA
B) Oxaloacetate
C) Glucose
D) G3P
✅ Answer: A) Acetyl CoA
🧠 Explanation: Pyruvate from glycolysis is converted to Acetyl CoA, which enters the Krebs cycle.

38. Which process produces CO₂ in both plants and animals?

A) Photosynthesis
B) Krebs cycle
C) Glycolysis
D) Electron transport
✅ Answer: B) Krebs cycle
🧠 Explanation: Decarboxylation reactions of the Krebs cycle release CO₂.

39. Energy currency of the cell is:

A) NADH
B) FADH₂
C) Glucose
D) ATP
✅ Answer: D) ATP
🧠 Explanation: ATP stores and transfers energy in cellular processes.

40. Which coenzyme is reduced during glycolysis?

A) FAD
B) NAD⁺
C) ATP
D) CoA
✅ Answer: B) NAD⁺
🧠 Explanation: NAD⁺ is reduced to NADH in glycolysis.

41. First step of Krebs cycle is condensation of:

A) Oxaloacetate + Acetyl CoA → Citric acid
B) Pyruvate + O₂ → CO₂
C) Glucose → Pyruvate
D) Acetyl CoA → Pyruvate
✅ Answer: A) Oxaloacetate + Acetyl CoA → Citric acid
🧠 Explanation: This step initiates the Krebs cycle.

42. Fermentation is different from aerobic respiration in that it:

A) Requires O₂
B) Occurs in mitochondria
C) Yields more ATP
D) Involves no oxygen
✅ Answer: D) Involves no oxygen
🧠 Explanation: Fermentation occurs anaerobically, without the use of oxygen.

43. Lactic acid fermentation occurs in:

A) Yeast
B) Muscle cells
C) Liver
D) Chloroplast
✅ Answer: B) Muscle cells
🧠 Explanation: In oxygen-limited conditions, muscles perform anaerobic respiration forming lactic acid.

44. Which process involves decarboxylation?

A) Glycolysis
B) Fermentation
C) Link reaction
D) Photophosphorylation
✅ Answer: C) Link reaction
🧠 Explanation: Pyruvate is decarboxylated to form Acetyl CoA.

45. The number of ATPs obtained from oxidation of 2 NADH from glycolysis in mitochondria:

A) 4
B) 6
C) 2
D) 8
✅ Answer: B) 6
🧠 Explanation: Each NADH gives 3 ATP → 2 NADH = 6 ATP (via shuttle systems).

46. In mitochondria, chemiosmotic ATP synthesis is driven by:

A) Temperature gradient
B) Proton gradient
C) Electron flow
D) Enzyme activity
✅ Answer: B) Proton gradient
🧠 Explanation: The ETC pumps H⁺ to create a proton gradient used by ATP synthase.

47. Main role of oxygen in respiration:

A) Substrate for glycolysis
B) Oxidizes pyruvate
C) Final electron acceptor
D) Forms glucose
✅ Answer: C) Final electron acceptor
🧠 Explanation: Oxygen accepts electrons and forms water at the end of ETC.

48. How many ATPs are directly formed in glycolysis (gross)?

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

49. Enzyme that helps in ATP synthesis during ETC is:

A) ATPase
B) Hexokinase
C) ATP synthase
D) Phosphorylase
✅ Answer: C) ATP synthase
🧠 Explanation: ATP synthase uses proton gradient to generate ATP.

50. Which metabolic process is not part of respiration?

A) Krebs cycle
B) Electron transport
C) Calvin cycle
D) Glycolysis
✅ Answer: C) Calvin cycle
🧠 Explanation: Calvin cycle is part of photosynthesis, not respiration.

📘 That’s a wrap on Chapter 14 – Respiration in Plants (Q1–50)!
You’re now solid on this chapter’s most frequently asked NEET questions.

🔗 Keep following for more:


Comments

Post a Comment

Popular posts from this blog

50 Most Important NEET PYQs of Chapter "Living World" with Detailed Solutions

-
 Certainly! Below is a complete set of 50 Most Important NEET PYQs of Chapter "Living World" with detailed solutions. The blog concludes with a call to follow @neetpyqall for more updates. 50 Most Important NEET PYQs of Chapter "Living World" with Detailed Solutions Welcome to a comprehensive guide to the Living World chapter from your NEET Biology syllabus. This chapter forms the foundation for understanding biological classification, characteristics of life, and the diversity of organisms. Here, we cover 50 crucial previous year questions (PYQs) from NEET, with detailed answers and explanations. 1. Question : Which of the following is NOT a characteristic feature of living organisms? A) Growth B) Ability to reproduce C) Inability to respond to stimuli D) Metabolism Answer : C) Inability to respond to stimuli Explanation : Living organisms respond to external stimuli, which is a fundamental characteristic of life. The other options—growth...
Read more

NEET PYQs – Chapter 2: Biological Classification (Top 50 Questions with Detailed Solutions)

-
 Got it! Here's your complete blog-style post with 50 most important NEET previous year questions from Chapter 2 – Biological Classification , including answers and detailed solutions. 🧬 NEET PYQs – Chapter 2: Biological Classification (Top 50 Questions with Detailed Solutions) Perfect for NEET 2025 aspirants! Dive into these handpicked questions from previous years to master the concepts of this chapter. 1. Five Kingdom Classification was Proposed by: A) Carolus Linnaeus B) R.H. Whittaker C) Aristotle D) Ernst Haeckel ✅ Answer: B) R.H. Whittaker Explanation: In 1969, R.H. Whittaker introduced the five kingdom classification: Monera, Protista, Fungi, Plantae, and Animalia. 2. Kingdom Monera Consists of: A) Multicellular organisms B) Unicellular eukaryotes C) Unicellular prokaryotes D) Multicellular eukaryotes ✅ Answer: C) Unicellular prokaryotes Explanation: Monera includes bacteria and blue-green algae, which are unicellular and prokaryot...
Read more

50 Most Important NEET PYQs of Chapter 13: Photosynthesis in Higher Plants – Part 1 (Q1–25) | By neetpyqall

-
🌿 50 Most Important NEET PYQs of Chapter 13: Photosynthesis in Higher Plants – Part 1 (Q1–25) | By neetpyqall Get ready to master one of the most frequently asked and high-weightage chapters of NEET – Photosynthesis in Higher Plants . Below are 25 highly important Previous Year Questions (PYQs) with detailed explanations to help you gain conceptual clarity and improve accuracy in the exam. 1. Which of the following is a correct statement regarding photosynthesis? A) Oxygen is consumed B) CO₂ is released C) It is an exothermic reaction D) It is an endothermic reaction ✅ Answer: D) It is an endothermic reaction Explanation: Photosynthesis requires energy (sunlight) to convert CO₂ and H₂O into glucose, making it an endothermic process. 2. In which part of the chloroplast does the light reaction occur? A) Stroma B) Outer membrane C) Grana (thylakoid membranes) D) Inner membrane ✅ Answer: C) Grana (thylakoid membranes) Explanation: Light-dependent reactions occur in th...
Read more