BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Growth movement of plants towards the stimulus is known as positive tropism while movement of plant/plant parts away from the stimulus is known as negative tropism.

Detailed explanation-2: -Positive tropism is when a plant moves towards a stimulus. Negative tropism is when a plant moves away from a stimulus.

Detailed explanation-3: -A tropism is directional growth in response to a stimulus. A positive tropism occurs when a plant (or a part of the plant) grows towards the stimulus, and a negative tropism is growth away from the stimulus. Phototropism is directional growth in response to light (Figure 14.1.

Detailed explanation-4: -A typical example of a phototropic response is the growth of the hypocotyl of a seedling towards the light source (positive phototropism) and the growth away from that source of the root (negative phototropism).

Detailed explanation-5: -Gravitropism ensures that roots grow into the soil and that shoots grow toward sunlight. Growth of the shoot apical tip upward is called negative gravitropism, whereas growth of the roots downward is called positive gravitropism.