Question

Dark reactions are called biosynthetic phase of photosynthesis. 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 $NADPH$.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (B)

If both assertion and reason are true but reason is not the correct explanation of assertion

Answer 2

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.