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  4. Which of the following statements about dark reactions is correct?

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Q. Which of the following statements about dark reactions is correct?

Photosynthesis in Higher Plants

Solution:

Biosynthetic phase (Dark or Blackman's reaction) catalyses the assimilation of $CO_{2}$ to carbohydrates. These reactions occur in stroma or matrix of chloroplasts and all the enzymes required for the processes are present in the stroma/ matrix of chloroplasts. These reactions do not require light, instead assimilatory power ($ATP$ and $NADPH$) produced during photochemical (light) phase is used in fixation and reduction of $CO_{2}$. However, this should not be construed to mean that they occur in darkness or that they are not light dependent.