PLANT PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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fix CO2 intoorganic acids during the night when temperatures are cooler.
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fix CO2 into bycombining it with RuBP in the Calvin cycle.
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obtain CO2 through their roots during the day.
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fixCO2 into organic acids in the mesophyll cells, which do not rely on stomata.
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Detailed explanation-1: -They can do this because they. fix CO2 into organic acids during the night.
Detailed explanation-2: -Unlike plants in wetter environments, CAM plants absorb and store carbon dioxide through open pores in their leaves at night, when water is less likely to evaporate. During the day, the pores, also called stomata, stay closed while the plant uses sunlight to convert carbon dioxide into energy, minimizing water loss.
Detailed explanation-3: -Their stomata remain open during the night. This is done because they tend to minimise the rate of transpiration. It is the characteristic feature of CAM plants. These plants fix carbon dioxide during the night but form sugars only during the day when RuBisCO is active.
Detailed explanation-4: -In a plant using full CAM, the stomata in the leaves remain shut during the day to reduce evapotranspiration, but open at night to collect carbon dioxide (CO2). Q.