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Science · 2025 · 3 marks
CBSE 2025 · Region 1 · Set 3 · Q31
A hormone 'X' is secreted in blood when a person is under scary situation. (a) Identify the hormone 'X' and the gland that secretes it. (b) Explain…
A hormone 'X' is secreted in blood when a person is under scary situation.
(a)
Identify the hormone 'X' and the gland that secretes it.
(b)
Explain its role in dealing with scary or emergency situations.
Marking-scheme solution
(a) Adrenaline Adrenal Gland
(b) It acts on heart. Heart beats faster, resulting in more supply of oxygen to skeletal muscles. The blood to the digestive system and skin is reduced due to contraction of muscles around small arteries in these organs. Breathing rate increases because of contraction of diaphragm and the rib muscles.
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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.