Question

Guard cells:

control the size of a water vacuole
help roots take up water
control the size of stomata
support the stem of the plant

Answer 1

Hey there!

The purpose of guard cells is to control the opening and closing of the Stomata, keeping it the correct width, or size.

Therefore, your correct answer would be Option 3, control the size of the Stomata.

Hope this helps!

Answer 2

Answer: Option C

Explanation: The guard cells helps in controlling the size of stomata. Guard cells are special type of cells that lies in the epidermis of the leaves.

These cells controls the loss of water by changing the shape and size of stomata. The stomatal pore is largest when there is abundant of water available for uptake.

But when there is loss of water, the guard cells become flaccid and prevents the loss of water.

So, the guard cells control the size of stomata.