Chapter Exam

Unit 1 Chapter 4: Photosynthesis in Higher Plants — Online MCQ Test

Q: Which pigment is the primary site of light absorption in photosynthesis?

Answer: A. Chlorophyll a — Chlorophyll a is the main photosynthetic pigment and directly participates in the conversion of light energy into chemical energy.

Q: In photosynthesis, oxygen is released during the splitting of which substance?

Answer: B. Water — Oxygen is released during photolysis of water in the light reaction.

BOTANY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Unit 1 Chapter 4: Photosynthesis in Higher Plants with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR BOTANY. This chapter covers: This chapter details photosynthetic pigments light reaction electron transport cyclic non-cyclic photophosphorylation Calvin cycle C4 pathway photorespiration and factors affecting.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 1 Chapter 4: Photosynthesis in Higher Plants — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR BOTANY — Unit 1 Chapter 4: Photosynthesis in Higher Plants, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which pigment is the primary site of light absorption in photosynthesis?

A. Chlorophyll a ✓
B. Chlorophyll b
C. Xanthophyll
D. Carotene

Answer: A. Chlorophyll a
Chlorophyll a is the main photosynthetic pigment and directly participates in the conversion of light energy into chemical energy.

In photosynthesis, oxygen is released during the splitting of which substance?

A. Carbon dioxide
B. Water ✓
C. Glucose
D. ATP

Answer: B. Water
Oxygen is released during photolysis of water in the light reaction.

The main function of accessory pigments in photosynthesis is to:

A. Produce glucose directly
B. Absorb light and transfer energy to chlorophyll a ✓
C. Release oxygen
D. Fix carbon dioxide

Answer: B. Absorb light and transfer energy to chlorophyll a
Accessory pigments broaden the range of light absorption and transfer the absorbed energy to chlorophyll a.

Which of the following statements about photorespiration is correct?

A. It occurs only in C4 plants and increases sugar formation
B. It involves oxygenation of RuBP and leads to loss of CO2 ✓
C. It occurs in chloroplasts only under dark conditions
D. It is a highly efficient process for ATP synthesis

Answer: B. It involves oxygenation of RuBP and leads to loss of CO2
Photorespiration begins when RuBisCO acts as an oxygenase, causing CO2 loss and reducing photosynthetic efficiency.

Which of the following is the most board-exam accurate reason C4 plants are better adapted to high temperature and intense light conditions?

A. They have a higher rate of photorespiration
B. They minimize photorespiration by concentrating CO2 in bundle sheath cells ✓
C. They lack RuBisCO and use oxygen instead of carbon dioxide
D. They perform photosynthesis only at night

Answer: B. They minimize photorespiration by concentrating CO2 in bundle sheath cells
C4 plants reduce photorespiration by using PEP carboxylase and the Kranz anatomy-based CO2 concentrating mechanism.