Question

1.Define stimulus and response.
2. Since plant do not have a nervous system they do not show any kind of coordination. Do you agree with this statement? why or why not?

Answer 1

Stimulus : Something that can elicit or evoke a response in a cell, a tissue, or an organism. It can be external or internal.

Response : A reaction to a specific stimulus.

Example : The body temperature is raised by the release of chemicals in white blood cells. This increased temperature kills bacteria and inhibit viruses.

Stimuli : Bacterial infection. Response : Fever

Another response for internal stimuli,

Stimuli : Ingest Poison. Response : Vomiting

​​​​​​yes they show a different kind of coordi

Plants do not have any nervous system. Control and coordination in a plant takes place with the help of plant hormones (Phytohormones). That's why response to stimulus in a plant is slower than animals because they do not have any nervous system.

Kind of Plant Hormones are:

1.Auxin

2.Gibberelins

3.Cytokinin

4.Absisic Acid

nation.