Photosynthesis, Respiration and Nutrition in Plants 

31. The key enzyme involved in carbon fixation during C4 photosynthesis is:

a) Rubisco

b) PEP carboxylase

c) ATP synthase

d) NADP+ reductase

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32. During the process of nitrogen fixation, nitrogen gas is converted into ammonia with the help of:

a) Nitrogenase enzyme

b) Nitrate reductase enzyme

c) Nitrite reductase enzyme

d) Nitric oxide synthase enzyme

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33. Mycorrhizae are symbiotic relationships between plants and:

a) Animals

b) Fungi

c) Bacteria

d) Viruses

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34. The primary function of mycorrhizae is to:

a) Fix nitrogen for plants

b) Produce antibiotics to protect plants from pathogens

c) Enhance nutrient absorption for plants

d) Aid in the process of pollination

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35. The process by which plants respond to light by bending towards it is called:

a) Gravitropism

b) Phototropism

c) Thigmotropism

d) Hydrotropism

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