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Question
Source of CO2 for photosynthesis during day in CAM plants is
Source of CO2 for photosynthesis during day in CAM plants is
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Solution
The correct option is C Malic acid
Crassulacean acid metabolism occurs only in green organs and the plants which exhibit it belong to a number of different families. The distinctive diurnal fluctuation in acidity in plants showing CAM is predominantly due to changes in amounts of vacuolar malic acid in the mesophyll cells. During the night, malic acid is synthesized utilising CO2 (dark CO2 fixation) which then accumulates in the vacuole and may account for about 85% of the total titrable acid content.
So, the correct option is 'Malic acid'.
Crassulacean acid metabolism occurs only in green organs and the plants which exhibit it belong to a number of different families. The distinctive diurnal fluctuation in acidity in plants showing CAM is predominantly due to changes in amounts of vacuolar malic acid in the mesophyll cells. During the night, malic acid is synthesized utilising CO2 (dark CO2 fixation) which then accumulates in the vacuole and may account for about 85% of the total titrable acid content.
So, the correct option is 'Malic acid'.
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