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Science · 2026 · 3 marks
CBSE 2026 · Region 4 · Set 2 · Q14
Give reasons for the following: (a) Plants do not have an excretory system so how they excrete their wastes? (b) Why do mammals and birds have double…
Give reasons for the following :
(a)
Plants do not have an excretory system so how they excrete their wastes?
(b)
Why do mammals and birds have double circulation ?
Marking-scheme solution
(a) Some waste is stored in leaves that fall off/wastes may be stored in cellular vacuoles/other wastes are stored as resins and gums in old xylem/ may excrete some waste into soil via roots.
(b) Mammals and birds have high energy needs to maintain their body temperature. Therefore, mixing of blood is prevented by separation of right and left side of heart and thus they have double circulation.
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.