Chapter Exam

Unit 1 Chapter 5: Respiration in Plants — Online MCQ Test

Q: In glycolysis, one molecule of glucose is broken down into how many molecules of pyruvic acid?

Answer: B. 2 — One glucose molecule undergoes glycolysis to form two molecules of pyruvic acid. This is the first stage of cellular respiration in the cytoplasm.

Q: Which organelle is mainly responsible for the Krebs cycle and electron transport system in aerobic respiration?

Answer: C. Mitochondrion — The Krebs cycle occurs in the mitochondrial matrix and the electron transport system is located on the inner mitochondrial membrane.

Q: During glycolysis, the net gain of ATP molecules from one glucose molecule is:

Answer: B. 2 — Although 4 ATP are formed in glycolysis, 2 ATP are consumed in the initial steps, so the net gain is 2 ATP.

BOTANY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Unit 1 Chapter 5: Respiration in Plants with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR BOTANY. This chapter covers: Focusing on cellular energetics this chapter details glycolysis fermentation Krebs cycle electron transport system oxidative phosphorylation respiratory quotient and amphibolic pat.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 1 Chapter 5: Respiration in Plants — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR BOTANY — Unit 1 Chapter 5: Respiration in Plants, with answers and explanations. These are sample questions; the exam has its own separate question set.

In glycolysis, one molecule of glucose is broken down into how many molecules of pyruvic acid?

A. 1
B. 2 ✓
C. 3
D. 4

Answer: B. 2
One glucose molecule undergoes glycolysis to form two molecules of pyruvic acid. This is the first stage of cellular respiration in the cytoplasm.

Which organelle is mainly responsible for the Krebs cycle and electron transport system in aerobic respiration?

A. Ribosome
B. Golgi body
C. Mitochondrion ✓
D. Lysosome

Answer: C. Mitochondrion
The Krebs cycle occurs in the mitochondrial matrix and the electron transport system is located on the inner mitochondrial membrane.

During glycolysis, the net gain of ATP molecules from one glucose molecule is:

A. 1
B. 2 ✓
C. 4
D. 6

Answer: B. 2
Although 4 ATP are formed in glycolysis, 2 ATP are consumed in the initial steps, so the net gain is 2 ATP.

Which of the following comparisons between aerobic and anaerobic respiration is correct?

A. Aerobic respiration yields less ATP than anaerobic respiration
B. Aerobic respiration always produces ethanol
C. Anaerobic respiration does not involve the Krebs cycle ✓
D. Anaerobic respiration occurs only in mitochondria

Answer: C. Anaerobic respiration does not involve the Krebs cycle
Anaerobic respiration in plant cells bypasses the Krebs cycle and ETS, yielding much less ATP than aerobic respiration.

Which one of the following statements about respiration in plants is the most accurate?

A. It is identical to photosynthesis except for the location
B. It completely stops during daytime
C. It provides intermediates for synthesis of amino acids, fats, and nucleotides ✓
D. It occurs only in mature, non-green tissues

Answer: C. It provides intermediates for synthesis of amino acids, fats, and nucleotides
Respiratory pathways supply not only energy but also metabolic intermediates used in the synthesis of many biomolecules, making respiration amphibolic.