Question

Stomata open during day time because the guard cells
(a) Produce osmotically active sugars or organic acids
(b) Are thin walled
(c) Are bean shaped
(d) Have to help in gaseous exchange​

Answer 1

Answer:

d)

Explanation:

Light is one environmental signal for guard cells. Guard cells usually keep stomata open during the day and closed at night because during the night there is no sunlight for photosynthesis. If the stomata were open at night, very little gas exchange would occur, but water loss would still continue

The two main functions of stomata are to allow for the uptake of carbon dioxide and to limit the loss of water due to evaporation. In many plants, stomata remain open during the day and closed at night. Stomata are open during the day because this is when photosynthesis typically occurs.

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Answer 2

Answer:

The correct option is (a).

Explanation:

Stomata are tiny pores found on the surface of leaves. These pores play a crucial role in gaseous exchange and water transportation through transpiration in plants. Stomatal movement is regulated by guard cells and the guard cells have chloroplast in it which performs photosynthesis and prepares food. The food basically contains osmotically active sugars or organic acids. Due to the formation of these substances, the osmotic pressure of guard cells increases which further increases the turgor pressure and this increase in turgor pressure causes guard cells to perform endo-osmosis due to which the stomata gets opened. Hence, the correct option is a.

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