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Science · 2025 · 3 marks
CBSE 2025 · Region 5 · Set 2 · Q33
Give reasons for the following: (a) Rate of breathing in aquatic animals is much faster than terrestrial organisms. (b) Rings of cartilage are…
Give reasons for the following :
(a)
Rate of breathing in aquatic animals is much faster than terrestrial organisms.
(b)
Rings of cartilage are present in throat of human being.
(c)
During anaerobic respiration, a $\displaystyle 3$ carbon molecule (compound) is formed as an end product instead of $\displaystyle \mathrm{CO}_{2}$ in some cells of human beings.
Marking-scheme solution
(a)
Amount of dissolved oxygen is fairly low in water as compared to the amount of oxygen in air.
(b)
Rings of cartilage ensure that air passage does not collapse in absence of air
(c)
Due to lack of oxygen in our muscle cells
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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.