Question

Opening and closing of pores is a function performed by an element- 1. Na 2. K 3. S 4. C

Answer 1

Opening and closing of pores is a function performed by an element - - - C

Explanation:

C - Carbon dioxide

Answer 2

Answer: 2. K

Explanation: Opening and closing of pores here is described about the leaf and it happens in stomata. There present guard cells surrounding stomata

which due to pressure changes facilitates opening and closing of stomatal pores during respiration in plants.

This pressure change occurs as a result of absorption or accumilation of K+ that makes guard cells turgid and cause opening of pores and depolarization or loss of K+ makes guards cells shrink and cause closing of pores.

Therefore it is clear that K (pottassium) is the element responsible for opening and closing of pores.