Question

What are the factors responsible for the opening and closing of stomata?

Answer 1

The four factors affecting opening and closing of stomata are: (1) Light (2) Water Content of Epidermal Cells (3) Temperature and (4) Mineral Elements. ... Such stomata are called scotoactive stomata.

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Answer 2

Answer:  

The four factors responsible for opening and closing of stomata are:

(1) 'light'  

(2) Water Content found in 'Epidermal Cells'

(3) Temperature  

(4) 'Mineral Elements'.

Explanation:

The 'opening and closing' of the 'stomata' are controlled by the 'guard cells'. When there is light, guard cells take in water through the process called 'osmosis' and turns turgid. As their 'inner walls' are rigid, this results in the opening of the pore.

Due to 'absorption of water', the guard cells swell which results in the 'opening of stomatal pores' when the 'shrinking of guard cells' 'closes the pores'.  'Opening and closing of stomata' occur due to 'turgor changes' in guard cells.