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Science · 2023 · 5 marks
CBSE 2023 · Region 1 · Set 2 · Q35
(a) What happens when the egg is not fertilised? (b) How is sperm genetically different from a human egg / ova? (c) List any three contraceptive…
(a)
What happens when the egg is not fertilised ?
(b)
How is sperm genetically different from a human egg / ova ?
(c)
List any three contraceptive methods practised for family planning. Mention how these methods work.
Marking-scheme solution
(a)
The lining of uterus breaks down and comes out through vagina in the form of blood and mucus.
(b)
The sex chromosome in sperm is either X or Y while the sex chromosome in a human egg is only X.
(c)(i)
. Surgical Method - In prevents sperm transfer and fertilisation.
(ii)
. Barrier Method - Sperm does not reach the egg/prevents STD's
(iii)
.Use of oral pills - Eggs are not released because hormonal balance is changed.
All How do Organisms Reproduce? questions2023 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 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.