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Science · 2023 · 3 marks
CBSE 2023 · Region 6 · Set 1 · Q29
(a) Name the gland and the hormone secreted by it in scary situations in human beings. List any two responses shown by our body when this hormone is…
Name the gland and the hormone secreted by it in scary situations in human beings. List any two responses shown by our body when this hormone is secreted into the blood.
In the given diagram
(i)
Name the parts labelled A, B, and C.
(ii)
Write the functions of A and C.
(iii)
Reflex arcs have evolved in animals ? Why ?
Marking-scheme solution
(a) •Adrenal gland ; Adrenaline hormone
Response-
Breathing rate increases
Blood supply diverted to skeletal muscles.
(i) A - Sensory neuron B -Relay Neuron
C - Effector organ/Muscle
(ii) A- Carries impulse from receptor to spinal cord C- Responds to stimulus
(iii) The thinking process of the brain is not fast enough / Reflex arcs are more efficient in functioning in the absence of true thought processes
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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.