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Science · 2025 · 2 marks
CBSE 2025 · Region 1 · Set 1 · Q23
(a) Besides minimising the loss of blood, why is it essential to plug any leak in a blood vessel? Name the component of blood which helps in this…
(a)
Besides minimising the loss of blood, why is it essential to plug any leak in a blood vessel ? Name the component of blood which helps in this process and state how this component perform this function.
OR
(b)(i)
The transport system in plants is relatively slower than in animals. Give reasons.
(ii)
State the role of phloem in the transport of materials in
Marking-scheme solution
(a)
Plugging of the leak in blood vessels prevents lowering of the blood pressure / maintains the efficiency of the pumping system.
Platelets
Help to clot the blood at the site of injury. OR
(b)
(i) Plants have low energy needs because they have a large proportion of dead cells in many tissues / Plants have low energy needs as they do not move
(ii) Translocation of soluble products of photosynthesis from leaves to other parts of the plant / It transports amino acids and other substances to storage organs of roots, fruits and seeds and to growing organs.
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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.