31. The key enzyme involved in carbon fixation during C4 photosynthesis is:
a) Rubisco
b) PEP carboxylase
c) ATP synthase
d) NADP+ reductase
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
33. Mycorrhizae are symbiotic relationships between plants and:
a) Animals
b) Fungi
c) Bacteria
d) Viruses
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
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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