LA : What is tropic movement? Explain two types of tropic (phototropic and geotropic) movements in plants

Question

What is tropic movement? Explain two types of tropic (phototropic and geotropic) movements in plants.

Answer

Tropic movement: Tropic movement is a type of plant movement that occurs in response to a directional stimulus, such as light or gravity.

1. Phototropism: Phototropism is a tropic movement that occurs in response to light.
   There are two types of phototropism :
   a) Positive phototropism – In positive phototropism, the plant grows towards the source of light.
   Example – Movement of the shoot.
   b) Negative phototropism – in negative phototropism, the plant grows away from the source of light.
   Example – Movement of the root.
2. Geotropism: Geotropism is a tropic movement that occurs in response to gravity.
   a) Positive phototropism – In positive geotropism, the plant grows downwards, towards the centre of gravity.
   Example – Movement of the root.
   b) Negative phototropism – In negative geotropism, the plant grows downwards, away from the centre of gravity.
   Example – Movement of the root.