Sleep movements of leaves in some plants are due to

Options

(a) excess of respiration
(b) leaves stop photosynthesis
(c) excess of transpiration
(d) osmotic changes at the base of leaves

Correct Answer:

osmotic changes at the base of leaves

Explanation:

Sleep movement or nyctinasty (sleep movement during night) occurs in the leaves of many legumes and Oxallis is due to turgor changes in response to darkness. The leaves fold at night but open during the day. Leaves of Mimosa pudica also show sleep movement, called as seismonasty (shock movement) in response to physical contact, injury, electric current etc. The movement occurs due to osmotic changes.