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Class 11 Biology MCQ Chapter 12 Respiration in Plants
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Respiration in Plants
Chapter – 12
UNIT – (IV) PLANT PHYSIOLOGY |
MCQ |
1. What element controls the binding of CO2 to the RuBisCO active site?
(a) Sunlight intensity.
(b) Chloroplast count.
(c) Closing and opening of stomata.
(d) Relative oxygen and carbon dioxide concentrations.
Ans: (d) Relative oxygen and carbon dioxide concentrations.
2. Which of these occurs in the first phase of the Calvin pathway?
(a) Three molecules of 2PGA are created.
(b) CO2 and RuBisCO combine to make.
(c) RuBP and CO2 mix to form PGA.
(d) RuBP serves as an activator.
Ans: (c) RuBP and CO2 mix to form PGA.
3. What causes a decline in carbon dioxide fixing in certain C3 plants?
(a) Formation of phosphoglycerides.
(b) The absence of RuBP.
(c) RuBisCO binds oxygen.
(d) RuBP binds oxygen.
Ans: (c) RuBisCO binds oxygen.
4. When lactic acid and alcohol are fermented, how much energy is released?
(a) Less than 7%
(b) More than 7%
(c) More than 50%
(d) More than 75%
Ans: (a) Less than 7%
5. Which of these is produced by photorespiration?
(a) NADPH.
(b) ATP.
(c) CO2.
(d) Sugars.
Ans: (c) CO2.
6. Why do C4 plants have higher production than C3 plants?
(a) C4 plants exhibit Kranz anatomy.
(b) Photorespiration is absent in C4 plants.
(c) High phosphoglycerate formation is observed in C4 plants.
(d) High phosphoglycolate generation is evident in C4 plants.
Ans: (b) Photorespiration is absent in C4 plants.
7. What does the name RuBisCO suggest?
(a) Its active site can bind to oxygen and carbon dioxide.
(b) It causes the synthesis of carbon dioxide and oxygen.
(c) In order to break down sugar, it utilises carbon and oxygen.
(d) It decomposes RuBP using carbon and oxygen.
Ans: (a) Its active site can bind to oxygen and carbon dioxide.
8. Which of these cannot assist us in identifying C3 from C4 plants?
(a) The acceptor molecule for carbon dioxide.
(b) The Kranz anatomy is present.
(c) Photorespiration.
(d) The number of chloroplasts.
Ans: (c) Photorespiration.
9. During photosynthesis, which gas is released into the atmosphere as a by product?
(a) Carbon dioxide.
(b) Oxygen.
(c) Nitrogen.
(d) Methane.
Ans: (b) Oxygen.
10. In which part of the plant does anaerobic respiration often occur, leading to the production of ethanol?
(a) Leaves.
(b) Roots.
(c) Stems.
(d) Flowers.
Ans: (b) Roots.
11. During respiration in plants, glucose is broken down into:
(a) Oxygen and carbon dioxide.
(b) Water and oxygen.
(c) Carbon dioxide and water.
(d) Glucose and oxygen.
Ans: (c) Carbon dioxide and water.
12. What is the final electron acceptor in the electron transport chain during aerobic respiration?
(a) Oxygen.
(b) Glucose.
(c) Carbon dioxide.
(d) Water.
Ans: (a) Oxygen.
13. In which one of the following processes CO2 is not released?
(a) Aerobic respiration in plants.
(b) Aerobic respiration in animals.
(c) Alcoholic fermentation.
(d) Lactate fermentation.
Ans: (d) Lactate fermentation.
14. Which of the following processes makes direct use of oxygen?
(a) Glycolysis.
(b) Fermentation.
(c) Kreb’s citric acid cycle.
(d) Electron transport.
Ans: (d) Electron transport.
15. During glycolysis, when glucose is catabolized to pyruvate, most of the energy of glucose is:
(a) Transferred to ADP, forming ATP.
(b) Transferred directly to ATP.
(c) Retained in the pyruvate.
(d) Transferred to ATP and NADH.
Ans: (d) Transferred to ATP and NADH.