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Temperature - The dark reactions of photosynthesis are enzymatic so the temperature is also controlled by this factor. Light reactions are temperature sensitive and they are not affected much. The C4 plants respond to higher temperature and show high rate of photosynthesis whereas C3 plants have much lower temperature. Tropical plants have a higher temperature optimum than the plant adopted to temperate climates.
Water - water stress causes stomata to close hence reducing CO2 availability. Water stress also makes leaves wilt, thus reducing the surface area of the leaves and their metabolic activity as well.
CO2 - The rate of photosynthesis increase with increase in carbon dioxide.
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Option 1: I, II, III only
Option 2: I and II only
Option 3: I, II, III and IV
Option 4: II and III only
Question : Which of the following is an air pollutant?
I Water vapour
II Carbon dioxide
III Hydrogen Gas
Option 1: Only I
Option 2: Only II
Option 3: Only III
Option 4: Both II and III
Question : Which of the following factors affect the distribution of population? I. Climate II. Soil III. Topography IV. Water
Option 1: II and IV
Option 2: I, III and IV
Option 3: I and III
Option 4: I, II, III, and IV
Question : Which among the following is a greenhouse gas?
I. Methane
II. Carbon dioxide
III. Nitrogen dioxide
Option 1: I and II
Option 2: I and III
Option 3: II and III
Option 4: All the above
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