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Science · 2025 · 5 marks
CBSE 2025 · Region 4 · Set 1 · Q35
(A) (i) What is regeneration? Give one example of an organism that shows this process and one organism that does not. Why does regeneration not occur…
(i)
What is regeneration? Give one example of an organism that shows this process and one organism that does not. Why does regeneration not occur in the latter?
(ii)
Water in a pond appears dark green and contains filamentous structures. Name these structures and the method by which they reproduce. Explain the process.
(i)
Name the part performing following functions in human male reproductive system :
(a)
Carries sperm
(b)
Production of male gametes
(c)
Whose secretion makes the transport of sperms easier
(d)
Provide suitable temperature for sperm formation
(ii)
Write any two characteristics of sperms.
(iii)
What are surgical contraceptive methods? Give the side effect caused by this procedure.
Marking-scheme solution
(i)
Regeneration: The ability to give rise to new individual organism from their body parts / If the individual is somehow cut or broken up into many pieces, then each piece grows into a new organism.
Organism show regeneration: Planaria /Hydra
Organism does not show regeneration: Spirogyra
Because it does not have specialised cells which proliferate to make new cell types and tissues.
(ii)
Spirogyra.
It reproduces through Fragmentation.
It simply breaks up into smaller pieces upon maturation. The pieces grow into new individuals.
(i)
(a) vas deferens
(b) testes
(c) prostate gland/ seminal vesicles
(d) scrotum
(ii) Consists of genetic material, has a tail for movement, small in size.
(iii)
Vas deferens in the males and fallopian tube in females is blocked to prevent fertilization.
Can cause infections if not performed properly.
All How do Organisms Reproduce? questions2025 question paperNCERT solutions: How do Organisms Reproduce?Practice How do Organisms Reproduce? →
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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.