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Science · 2025 · 3 marks
CBSE 2025 · Region 2 · Set 1 · Q29
(a) Define hormone. (b) "Hormones should be secreted in precise quantities. We have a feedback mechanism through which this is done." With the help…
(a)
Define hormone.
(b)
"Hormones should be secreted in precise quantities. We have a feedback mechanism through which this is done." With the help of an example justify the statement.
Marking-scheme solution
(a) Hormones are chemical messengers (substances) which regulate body functions / Hormones are the biochemical substances produced in one part of the body and move to the target organ or tissue to regulate body function.
(b) Example:If the sugar level in blood rises, it is detected by cells of pancreas which respond to produce more insulin to lower blood sugar level. As the blood sugar level falls, it is detected by the cells of pancreas and insulin secretion is reduced.
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.