Question

State different types of movements in plants mention two points of difference in them

Answer 1

There are two types of movement : map of leaves of sensitive plant, movement of shoot towards light



✏Movement of leaves of senstive plant:
1. it is a Nastic Movement which does not depend on the direction of stimulus applied.
2. the stimulus is touch
3. it is caused by the sudden loss of water from the swelling at the base of leaves.
4. it is not a growth movement.


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✏ Movement of shoot towards light:
1. it is a trophic movement which depends on the direction of stimulus applied.
2. the stimulus is light
3. it is caused by unequal growth on the two sides of the shoot.
4. it is a growth movement

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Answer 2

Tropic Movements or Tropism. The movement of a plant in the.

direction of stimulus is known as tropic movement or tropism.

Types of Tropism. Tropic movements are of four types. These are:

Phototropism. The movement of a part of the plant towards light is called phototropism.In plants two types of movements take place:

1. Tropic movements and

2. Nastic movements

Phototropism

The movement of a part of the plant towards light is called phototropism. Growth of aerial parts of a plant towards light is an example of phototropism.

2. Geotropism

The movement of a part of the plant towards gravity is called geotropism. Growth of roots of plants in downward direction is an example of geotropism.

3. Hydrotropism

The movement of a part of the plant towards water is called hydrotropism, e.g., movement of roots.

4. Chemotropism

The movement of a part of the plant towards a chemical is called chemotropism.During the process of fertilization the movement of pollen tube towards ovule due to secretion of a sugary chemical in the ovary is an example of chemotropism.

Nastic Movements

These are nondirectional movements which takes place neither towards nor away from the stimulus. The best example of nastic movement is folding and drooping of leaves of ‘touch me not’ plant when its leaves are touched with fingers.

Tropic movements are found virtually in all plants but nastic movements are mostly found in specialized plants and organs. In tropic movements, there is directional growth of a plant, or part of a plant, in response to an external stimulus such as gravity or light. ... Most nastic movements are temporary and reversible.