Stimulus And Response In Plants

This growth results from cell elongation occurring at different rates on different sides of the plant so that the plant bends in one direction.

Stimulus and response in plants. Potentially every cell in a plant can produce plant hormones. In the latter case an autonomic or a spontaneous reaction is produced. The stimulus may be an external agency or it may be due to some internal cause.

Here sunlight is the stimulus and the plants react by bending themselves towards the source of sunlight. If a plant grows in the direction of the stimuli gravity for example that is known as a positive tropism and negative tropism is the growth opposite from the stimuli. For example the plants respond to sunlight by bending towards it.

This is called response. Stimuli like the sun s light earth gravity and various physical stimuli all affect the growth of the plant and their direction generally dictates the direction of the plant s response. A stimulus is a change in the intensity or direction of application of energy which produces an appreciable effect upon the living protoplast and brings about a visible reaction or response.

Ul li the response of plants to a stimulus in a particular direction li ul 4. A plant s sensory response to external stimuli relies on chemical messengers hormones. Plants respond to stimuli either through growth or through movement without growth.

Tropisms are responses to stimuli that result in the long term growth of the plant toward or away from the stimulus. Stimuli and responses in plants 1. Every organism reacts to a stimulus in the form of some movements in the body.

Illani binti ibrahim science teacher mrsm tawau stimuli and responses in plants 2. Stimulus such as heat light cold pressure smell touch water and force of gravity. Plant hormones affect all aspects of plant life from flowering to fruit setting and maturation and from phototropism to leaf fall.