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Science · 2023 · 2 marks
CBSE 2023 · Region 5 · Set 2 · Q23
(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 ?
(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.(b) • Amphibians / reptiles
The temperature of the environment.
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CBSE Class 10 Science past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.