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Science · 2023 · 2 marks
CBSE 2023 · Region 2 · Set 1 · Q22
(a) Why is it important to prevent oxygenated and deoxygenated blood from mixing in birds and mammals? (b) Which animals can tolerate some mixing of…
(a)
Why is it important to prevent oxygenated and deoxygenated blood from mixing in birds and mammals ?
(b)
Which animals can tolerate some mixing of the oxygenated and deoxygenated blood streams ? On what factor does the body temperature of these animals depend ?
Marking-scheme solution
(a)
Birds and mammals have high energy needs to maintain their body temperature. The separation of oxygenated and deoxygenated blood allows a highly efficient supply of oxygen to maintain their body temperature.
(b) • Amphibians / reptiles;
Temperature of the environment.
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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.