Identify the effect of water on photosynthesis.

  • A
    Water acts as a reactant,so a decrease in water leads to a decrease in the rate of photosynthesis.
  • B
    $A$ decrease in water causes stomata to close,which reduces the availability of $CO_2$.
  • C
    Water stress causes leaves to wilt,reducing the surface area of the leaves.
  • D
    All of the above.

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