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Science · 2026 · 2 marks
CBSE 2026 · Region 2 · Set 1 · Q10
(a) "The timing and the amount of hormone secreted by a gland are regulated in the human body." Justify this statement with the help of an example.
(a)
"The timing and the amount of hormone secreted by a gland are regulated in the human body." Justify this statement with the help of an example.
OR
(b)
Electrical impulse is an excellent means to transmit information in the animal body, but there are some limitations to the use of electrical impulses. State any two limitations.
Marking-scheme solution
(a) The timing and amount of hormone released are regulated by feedback mechanism. For example, if the sugar levels in the blood rise, they are detected by the cells of the pancreas which respond by producing more insulin. As the blood sugar level falls, insulin secretion is reduced.
Electrical impulse reaches only those cells that are connected by nervous tissue, not each and every cell in the animal body.
Once an electrical impulse is generated in the cell and transmitted, the cell will take some time to reset its mechanism before it can generate and transmit a new impulse. / Transmission of electrical impulses is not a continuous process.
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.