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  1. Carbon dioxide joins the photosynthetic pathway in
    1. PS I
    2. PS II
    3. Light reaction
    4. Dark reaction
Correct Option: D

Photosynthesis is completed in two phases-light and dark phases. In dark phase (Blackman’s reaction or biosynthetic phase) carbohydrates are synthesised from carbon dioxide in stroma of chloroplast using ATP and NADPH products of light reactions.



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