What makes stomata open and close

1. A.
   High pressure of gases inside the cells.
2. B.
   Movement of water in and out of the guard cells.
3. C.
   Stimulus of light in the guard cells.
4. D.
   Diffusion of $\mathrm{CO_2}$ in and out of the guard cells.

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1. A.
   (i) only
2. B.
   (i) and (iii)
3. C.
   (ii) and (iii)
4. D.
   (ii) and (iv)

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1. A.
   $\mathrm{CO_2}$ concentration in stomata
2. B.
   Temperature in guard cells
3. C.
   $\mathrm{O_2}$ concentration in stomata
4. D.
   Amount of water in guard cells

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1. A.
   Entry of water into guard cells
2. B.
   Exit of water from guard cells
3. C.
   Entry of air into the stomatal pore
4. D.
   Entry of water into the stomatal pore

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