NEET BIOLOGY

Detailed explanation-1: -A tropism is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus. In tropisms, this response is dependent on the direction of the stimulus (as opposed to nastic movements which are non-directional responses).

Detailed explanation-2: -Growth toward or away from a stimulus is known as a tropism. You might have noticed that plants bend toward the light. This is an example of a tropism where light is the stimulus, known as phototropism (Figure below). To obtain more light for photosynthesis, leaves and stems grow toward the light.

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: -The movement of a whole plant or a part of plant, in response to the direction of stimulus is called tropism. The stimulus can be water, sunlight or gravity.