EVERYDAY SCIENCE

Detailed explanation-1: -A tropism is a turning toward or away from a stimulus in the environment. Growing toward gravity is called geotropism. Plants also exhibit phototropism, or growing toward a light source. This response is controlled by a plant growth hormone called auxin.

Detailed explanation-2: -Tropism is when a plant moves in response to an external stimulus in the environment. Positive tropism is when a plant moves towards a stimulus. Negative tropism is when a plant moves away from a stimulus.

Detailed explanation-3: -tropism, response or orientation of a plant or certain lower animals to a stimulus that acts with greater intensity from one direction than another. It may be achieved by active movement or by structural alteration.

Detailed explanation-4: -In biology, phototropism is the growth of an organism in response to a light stimulus. Phototropism is most often observed in plants, but can also occur in other organisms such as fungi. The cells on the plant that are farthest from the light contain a hormone called auxin that reacts when phototropism occurs.

Detailed explanation-5: -Because plants require sunshine to thrive, they will tilt or migrate towards the source of light. Phototropism is the name given to this type of movement. Negative phototropism occurs when a plant travels away from a light source. Positive phototropism occurs when plants grow toward the source of light.