Question

What is a tropic movement? Explain with an example.

Answer 1

Tropic movement:

1. Tropism or tropic movement in plants is a biological phenomenon.
2. It is the growth or turning movements in plants towards the stimulus.
3. This phenomenon is direction-dependent, and it reacts according to the stimulus's direction.
4. There are five different forms of tropic motions in plants.

Phototropism:

1. Phototropism is the response of plants to light.
2. Plants will grow in the direction of light in general.
3. Phototropism is positive when the plants orient toward the light and negative when the plant moves away from light.

Geotropism:

1. Plants that grow in the direction of gravity are called geotropism.
2. The geotropic movement is positive and negative.
3. When the roots of a plant grow deep into the ground, it is called positive geotropism.
4. When the shoots move upward direction, it is known as negative geotropism.

Chemotropism:

1. When tropic motions are influenced by chemical factors is called chemotropism.
2. During pollination, the female gametes secrete some chemicals to accomplish the process is an example of positive chemotropism.

Hydrotropism:

1. Hydrotropism is a phenomenon that happens when plants move in response to water.
2. As a result of this mechanism, roots grow towards the source of water.

Thigmotropism:

1. Thigmotropism is defined as the movement of a plant's reflex in response to touch.
2. The touch me not plant is a good example of this type of tropism.
3. The leaves of this particular plant droop as soon as they are touched.