If guard cells in a plant stop working then the stomata would not open and close.
Answer: B
Explanation
Guard cells are present in leaves of the plants.
It is located in surrounding of each stomata of the plants.
It is located in the leaves such that the stomata can be surrounded by these cells.
Its working is to open and close the stomata in regular intervals.
The regular intervals meant at morning and at night.
At morning, the stomata need to be open so that it can intake oxygen, water and release carbon-di-oxide.
The water taken is stored in the stomata in the night as the guard cells help to close the stomata at night preventing the loss of water.
But if the guard cells fail to work properly, then the stomata will remain either in open condition always or in close condition always.
This will lead to continuous water loss and change in the rate of transpiration of plants which will be harmful for it.
Thus the guard cells failure will lead to block the openings of stomata.
