Question

Differentiate between thigmonasty movement and photonasty movement​

Answer 1

Answer:

1. Seismonastic Movement:

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:

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.

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Answer 2

Answer:

hiii

buddy here is the answer to your question

Explanation:

Nastic movements are non-directional responses to stimuli such as temperature and heat.

 →The most important feature of this type of movement is that movements are not governed by the direction of the stimulus. 

→They may be induced by touch (seismonastic), temperature (Thermonastic), light, and chemicals. 

→Whatever be the direction of stimulus, the movements always occur in a particular direction without reference to the direction of the stimulus

→Example of seismonastic movement is the movement of Venus fly trap.

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→Tropic movement is the response to stimuli that comes from one direction.

→ It is a directional movement. 

→If the movement of the plant part is towards the stimulus, then it is known as positive tropism. If the movement of the plant part is away from the stimulus, then it is known as negative tropism. 

→For example phototropism, Geotropism etc.

hope it will be helpful to you

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