Stimuli and Responses: Responses in Plants and Animals
Stimuli and Responses: Responses in Plants and Animals
- Organisms survive better when they can respond to environmental changes.
- Growth factors in flowering plants regulate growth in response to directional stimuli, moving from growing areas to other tissues.
- Cell elongation in roots and shoots of flowering plants is affected by different concentrations of indoleacetic acid (IAA), explaining gravitropism and phototropism.
- Taxes and kineses are simple responses that help mobile organisms stay in favourable environments.
- The benefits of a simple reflex are demonstrated by a three-neurone simple reflex.
- Specific details of the spinal cord and dorsal and ventral roots are not needed.
- It is suggested to draw a plant diagram to demonstrate the effects of auxin.
- Additionally, draw a diagram to illustrate the nervous response in animals, showing both a reflex and a normal response.