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The reactions of photosynthesis make up ...

The reactions of photosynthesis make up a biochemical pathway.
Explain how the biochemical pathway of photosynthesis recycles many of its own reactions and identify the recycled reactants.

Text Solution

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The ATP and `NADPH_2` are generated during light reaction of photosynthesis.
(i) They help in reduction of carbon dioxide to carbohydrates and during the process they are converted to ADP and NADP.
(ii) They are sent back to the grana of chloroplast to form ATP and `NADPH_2`.
(iii) Similarly the `CO_2` from the atmosphere is said to be fixed by a `CO_2` acceptor molecule.
(iv) During successive reactions the carbon of `CO_2` is used for formation of glucose and the original acceptor molecule is recycled so that it can again help in `CO_2` fixation.
(v) Water is split during light reaction and oxygen is produced as a by-product.
(vi) At the same time water is again released as a by-product of dark reaction.
(vii) Thus many molecules such as ATP, `NADPH_2`, water, `CO_2` acceptor molecules are recycled during the biochemical pathway of photosynthesis.
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The reactions of photosynthesis make up a biochemical pathway. A) What are the reactants and products for both light and dark reactions. B) Explain how the biochemical pathway of photosynthesis recycles many of its own reactions and identify the recycled reactants.

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Knowledge Check

  • Identify true statement regarding light reaction of photosynthesis ?

    A
    Splitting of water molecule is associate with PS I
    B
    PS I and PS II involved in the formation of `NDPH + H^(+)`
    C
    The reaction center of PS I is Chlorophyll a with absorption peak at 680 nm
    D
    The reaction center of PS II is Chlorophyll a with absorption peak at 700 nm.

  • Identify true statement regarding light reaction of photosynthesis ?

    A
    Splitting of water molecule is assoicated with PS I
    B
    PS I and PS II involved in the formation of NDPH + `H^(+)`
    C
    The reaction centre of PS I is Chlorophyll a with absorption peak at 680 nm
    D
    The reaction center of PS II is Chlorophyll a with absorption peak at 700 nm.

  • Identify true statement regarding light reaction of photosynthesis?

    A
    Splitting of water molecule is associate with PS I.
    B
    PS `I^(-)` and PS II involved in the formation of `NDPH + H^(+)`
    C
    The reaction center of PS I Chlorophyll 'a' with absorption peak at 680nm.
    D
    The reaction center of PS II is Chlorophyll 'a' with absorption peak at 700 nm.

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