Responsiveness to stimuli and movement

A stimulus is any event or change in the surroundings that causes a reaction in living things. For example, loud sounds, light, or touch can be stimuli. Living things react when they sense a stimulus. This reaction is called responsiveness to stimuli, and it is a special feature of all living things.

• Examples of Animal Responses: If someone suddenly enters a cowshed, the cows and buffaloes may stand up, move, or even start mooing. These are examples of how animals react to changes in their environment.
• Examples of Plant Responses: A creeper in the courtyard may lean toward a support. A potted plant placed near a window will grow towards the sunlight. These are examples of plants moving in response to stimuli, even though they don't move like animals.

Responsiveness and movement

Movement is a change in position or shape that occurs when living things respond to stimuli. Both animals and plants show movement, but they do it in different ways. Being able to respond to stimuli helps living things survive by allowing them to adapt to changes in their environment.