Question

$\huge{\underline{\underline{\mathrm{\red{Question}}}}}$
The opening of the guard cells in stomata is regulated by _____________ .
1) photosynthesis
2) entry and exit of carbon dioxide
3) entry and exit of water
4) entry and exit of oxygen​

Answer 1

Answer:

3) entry and exit of carbon dioxide

Explanation:

as it is used in exchange of gasses

Answer 2

Explanation:

entry and exit of carbon dioxide