Question

Discuss the type of nastic movements with example​

Answer 1

Answer:

Nastic movements in plants are reversible and repeatable movements in response to a stimulus whose direction is determined by the anatomy of the plant. Examples include the diurnal movement of leaves and the response of insectivorous plants, such as the Venus fly trap, to prey.

Explanation:

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Answer 2

Answer:

There are five types of Nastic movements in plants.

1. Seismonastic Movement:

This type of movement is caused by the mechanical stimuli like shock, touch or contact, fast moving wind, rain drops, etc. In some parts of plants Seismonastic movement is seen in the stigmas, stamens and leaves. Example: Mimosa Pudica plant, Biophytum sensitivum, Neptunia etc.

2. Photonasty Movement:

The non-directional movement of a plant part usually in the petals of flowers in response to light is photonasty movement. The stimulus in Photonasty is light. Many petals of flowers open in the daylight and closed in the evening in response to the intensity of light. This is a growth movement in plants and an example of Photonastic movement. Examples are: Dandelion flower, Moonflower, flower of Cestrum Nocturnum etc.

3. Thermonastic movement:

Such movements in plants occur due to the change in temperature. Flowers of a plant open with the rise in temperature and close with a drop in temperature. Sometimes Thermonastic movement is associated with Photonastic movements also. In these both, the response mechanism is related to the growth, changes in the turgor on upper and lower sides of the petiole, leaf blade etc.

4. Nyctinastic movement:

This movement is caused due to the variations in light and temperature. It is also known as Sleeping movement. It can be classified under Photonastic and Thermonastic movement. It is seen in leguminous plants. The leaflets fold in the evening and open up in the morning.

5. Thigmonasty movement:

The non-directional movement of a plant in response to the contact of an object is called Thigmonasty movement. In the insectivorous plant’s leaves like Drosera, Dionaea the tentacles show variation in movements on coming in contact with an insect. The stimulus touch of an insect is transmitted to the entire leaf and all the tentacles bend over the insect.