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  4. Assertion: Dark reactions are called biosynthetic phase of photosynthesis. Reason :Dark reactions do not directly depend on the presence of light but are dependent on the products of the light reaction, i.e., ATP and NADPH.

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Q. Assertion: Dark reactions are called biosynthetic phase of photosynthesis.
Reason :Dark reactions do not directly depend on the presence of light but are dependent on the products of the light reaction, i.e., ATP and NADPH.

Photosynthesis in Higher Plants

Solution:

Photosythesis occurs in two phases: photochemical and biosynthetic. Photochemical phase is also called light or hill reaction. Biosynthetic phase is also called as dark or Blackman's reaction. Dark reaction catalyses assimilation of $CO_{2}$ to carbohydrates. They occur in stroma or matrix of chloroplasts. These reactions do not require light directly but depend on assimilatory power ($ATP$ and $NADPH$) produced during light reaction.