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Science · 2024 · 3 marks
CBSE 2024 · Region 1 · Set 3 · Q31
(i) Which organisms have a three-chambered heart? Why do they have three-chambered hearts? (ii) List two functions of lymph.
(i)
Which organisms have a three-chambered heart ? Why do they have three-chambered hearts ?
(ii)
List two functions of lymph.
Marking-scheme solution
(i)
Amphibians - frogs / Reptiles - lizards
The body temperature depends on the temperature in the environment. Therefore they can tolerate some mixing of the oxygenated and de-oxygenated blood streams.
(ii) Two functions:
Lymph carries digested and absorbed fat from intestine
Drains excess fluid from extra cellular space back into the blood.
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CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.