Unit 1 Chapter 4: Photosynthesis in Higher Plants — Online MCQ Test
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.
This chapter covers: This chapter details photosynthetic pigments light reaction electron transport cyclic non-cyclic photophosphorylation Calvin cycle C4 pathway photorespiration and factors affecting....
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Unit 1 Chapter 4: Photosynthesis in Higher Plants — Important Questions & Answers
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.
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.
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.
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.
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.
C4 plants reduce photorespiration by using PEP carboxylase and the Kranz anatomy-based CO2 concentrating mechanism.