(a) (i) List three points of difference between nervous and hormonal mechanisms for control and coordination…
(a) (i) List three points of difference between nervous and hormonal mechanisms for control and coordination in animals.
(ii) How are auxins related with the bending of plant shoot towards unidirectional light ? Explain.
Solution
(a) (i)
Nervous Control vs Hormonal Control:
1. Messages are sent as an electrical impulse. | Messages are carried in the form of chemicals (hormone)
2. It is carried through Neurons. | It is carried through blood.
3. Nerve impulses produce rapid responses. | Hormones produce slow responses.
4. Nerve impulses produce short lived responses. | Hormones produce long lasting responses.
(or Any other) (Any three)
(ii) When growing shoot is exposed to unidirectional light, it results in auxin shifting towards the shaded side.
More auxin causes more growth of shoot in the shaded side resulting in the bending of stem towards source of light.