Tag: movement in plants

Nyctinasty is the rhythmic nastic movement shown by plant in response to onset of darkness. Chemonasty is the nastic movement shown by plant in response to external chemical stimuli. Antherozoids are attracted towards archegonia in a fern plant due to chemonastic movement. Thigmonasty is the nastic movement shown by plant in response to the touch. Seismonasty is the nastic movement shown by plant in response to the vibration.

Nastic movement is non-directional movement shown by plant part in response to external stimuli. Thermonastic movement is response shown by plant part to high temperature. Photonastic movement is the response to light. Thigmonastic movement is the response to touch. Chemonastic movement is the response to the chemical.

Nastic movements are responses to plant parts to stimuli. Seismonasty is the nastic response of a plant to touch or vibration. Dropping down of leaves of Mimosa pudica upon touching is due to seismonasty. 

Nastic movements are responses to plant parts to stimuli. Thermonasty is nastic movement shown by the plant in response to high temperature. Photonasty is nastic movement shown by the plant in response to light. Hydronasty is nastic movement shown by the plant in response to water current. Thigmonasty is nastic movement shown by the plant in response to touch or vibration. Opening and closing of tulip flower is thermonastic movement. Sunflower shows photonastic movement. Thus, the correct answer is option A.

Nyctinastic movement is the rhythmic nastic movement of plant in response to the onset of darkness. It is also called as sleep movement. Drooping of legume leaves in dark is due to nyctinasty. Mimosa pudica shows nyctinastic movement. 

Photonasty is the nastic movement shown by plant part in response to light. Thermonasty is the nastic movement shown by plant part in response to high temperature. Seismonasty is the nastic movement shown by plant part in response to touch. The response of plants due to reversible turgor change in pulvinus as a result of touch is due to seismonasty. Chemonasty is the nastic movement shown by plant part in response to the chemical.

When the marginal glandular hair of Drosera leaf comes in contact with the insect body, they show thigmonastic (haptonastic) movement. It is the nastic movement (paratonic variation movement) determined by the external stimulus of touch or contact but the direction of movement is prefixed, determined by the structure of the responsive organ. Thus the correct answer is option C.