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NEETBotanyPhotosynthesis in Higher Plants

How many carbon atoms does oxaloacetic acid (OAA) have?

Options

  1. ATwo
  2. BThree
  3. CFour
  4. DFive

Correct answer

C. Four

Step-by-step solution

Let us now ask ourselves a question that was asked by the scientists who were struggling to understand the ‘dark reaction’. How many carbon atoms would a molecule have which after accepting (fixing) CO2 , would have 3 carbons (of PGA)? The studies very unexpectedly showed that the acceptor molecule was a 5-carbon ketose sugar – ribulose bisphosphate (RuBP). Did any of you think of this possibility? Do not worry;Scientists also tried to know whether all plants have PGA as the first product of CO2 fixation, or whethe

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