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Question

In CAM plants, the acceptor of CO2 is

A
Pyruvic acid.
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B
Oxaloacetate.
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C
Phosphoenol pyruvate.
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D
Nucleic acid.
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Solution

The correct option is C Phosphoenol pyruvate.
  • Crassulacean acid metabolism, also known as CAM photosynthesis, is a carbon fixation pathway that evolved in some plants as an adaptation to arid conditions.
  • At low temperatures (frequently at night), plants using CAM open their stomata, CO2 molecules diffuse into the spongy mesophyll's intracellular spaces and then into the cytoplasm. Here, they can meet phosphoenolpyruvate (PEP), the CO2 acceptor.
  • Hence, In CAM plants, the acceptor of CO2 is Phosphoenolpyruvate.
  • So, the correct answer is 'Phosphoenol pyruvate'.

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