Chapter Exam

Chapter 12: Respiration in Plants — Online MCQ Test

Q: Which molecule is the starting point of glycolysis in plant respiration?

Answer: A. Glucose — Glycolysis begins with glucose, which is broken down into two molecules of pyruvate.

Q: Where does glycolysis occur in the cell?

Answer: B. Cytoplasm — Glycolysis takes place in the cytoplasm of the cell, not inside mitochondria.

Q: During glycolysis, one molecule of glucose is converted into:

Answer: B. Two molecules of pyruvate — A single 6-carbon glucose molecule is split into two 3-carbon pyruvate molecules.

Q: Which of the following is NOT true about respiration in plants?

Answer: C. It takes place only at night — Respiration occurs continuously in living cells, both day and night.

BIOLOGY · CLASS 11 FIRST PUC · Karnataka State Board

Practice Chapter 12: Respiration in Plants with a free chapter-wise online MCQ test for Karnataka State Board CLASS 11 FIRST PUC BIOLOGY. This chapter covers: Glycolysis Krebs Cycle Electron Transport Chain ATP Aerobic Respiration Anaerobic Respiration Mitochondria Respiration Energy Production. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 12: Respiration in Plants — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 11 FIRST PUC BIOLOGY — Chapter 12: Respiration in Plants, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which molecule is the starting point of glycolysis in plant respiration?

A. Glucose ✓
B. Pyruvate
C. Acetyl CoA
D. Lactate

Answer: A. Glucose
Glycolysis begins with glucose, which is broken down into two molecules of pyruvate.

Where does glycolysis occur in the cell?

A. Mitochondrial matrix
B. Cytoplasm ✓
C. Inner mitochondrial membrane
D. Nucleus

Answer: B. Cytoplasm
Glycolysis takes place in the cytoplasm of the cell, not inside mitochondria.

During glycolysis, one molecule of glucose is converted into:

A. One molecule of pyruvate
B. Two molecules of pyruvate ✓
C. Two molecules of acetyl CoA
D. Six molecules of carbon dioxide

Answer: B. Two molecules of pyruvate
A single 6-carbon glucose molecule is split into two 3-carbon pyruvate molecules.

Which of the following is NOT true about respiration in plants?

A. It occurs in all living cells
B. It releases energy stored in glucose
C. It takes place only at night ✓
D. It involves enzyme-controlled reactions

Answer: C. It takes place only at night
Respiration occurs continuously in living cells, both day and night.

Which one of the following is the correct match?

A. Glycolysis — mitochondrial matrix
B. Krebs cycle — cytoplasm
C. Electron transport chain — inner mitochondrial membrane ✓
D. Fermentation — outer mitochondrial membrane

Answer: C. Electron transport chain — inner mitochondrial membrane
The ETC is located on the inner mitochondrial membrane, where proton pumping and ATP synthesis occur.