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Science · 2023 · 5 marks
CBSE 2023 · Region 2 · Set 1 · Q35
(a) (i) List three points of difference between nervous and hormonal mechanisms for control and coordination in animals. (ii) How are auxins related…
(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.
(i)
Name the disorder which a person is likely to suffer from due to the following :
(I)
Over-secretion of growth hormone
(II)
Deficiency of oestrogen in females
(III)
Less secretion of thyroxine Also name the gland that secretes each of the hormones mentioned above.
(ii)
How is the timing and amount of hormone released regulated ? Explain with the help of an example.
Marking-scheme solution
(a)(i)
| Nervous Control | Hormonal Control |
| 1. Messages are sent as an electrical impulse. | 1. Messages are carried in the form of chemicals (hormone) |
| 2. It is carried through Neurons. | 2. It is carried through blood . |
| 3. Nerve impulses produce rapid responses. | 3. Hormones produce slow responses. |
4. Nerve impulses produce short lived responses. & 4. Hormones produce long lasting responses.
(ii) The timing and amount of hormone released are regulated by feedback mechanisms.
Example - • If the sugar level in the blood rises more insulin is prod
As blood sugar level falls, insulin secretion is reduced.
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.