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Question

In which of the following respects the photosynthetic adaptations of C4 plants and CAM plants are similar?

A
In both cases, stomata normally close during the day
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B
Both types of plants make their sugar without the Calvin cycle
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C
In both cases, an enzyme other than rubisco carries out the first step in carbon fixation
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D
Neither C4 plants nor CAM plants have grana in their chloroplasts
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Solution

The correct option is C In both cases, an enzyme other than rubisco carries out the first step in carbon fixation
C4 and CAM plants are plants that use certain special compounds to gather carbon dioxide (CO 2 ) during photosynthesis. Exploitation of dry and arid habitats required adaptations in the form of C4 and CAM photosynthesis, which independently evolved many times during periods of low atmospheric CO2 levels carried out by carried out by a non-rubisco enzyme, PEP carboxylase, that has no tendency to bind O2.
So, the correct option is, 'In both cases, an enzyme other than rubisco carries out the first step in carbon fixation'.

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