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Science · 2024 · 5 marks
CBSE 2024 · Region 1 · Set 1 · Q35
(i)Name three techniques/devices used by human females to avoid pregnancy. Mention the side effects caused by each.(ii)What will happen if in a human female (a) fertilisation takes place, (b) an egg is not fertilised ?(i)Draw a diagram showing spore formation in Rhizopus and label the (a) reproductive and (b) non-reproductive parts. Why does Rhizopus not multiply on a dry slice of bread ?(ii)Name and explain the process by which reproduction takes place in Hydra.
(i)
Name three techniques/devices used by human females to avoid pregnancy. Mention the side effects caused by each.
(ii)
What will happen if in a human female (a) fertilisation takes place, (b) an egg is not fertilised ?
(i)
Draw a diagram showing spore formation in Rhizopus and label the (a) reproductive and (b) non-reproductive parts. Why does Rhizopus not multiply on a dry slice of bread ?
(ii)
Name and explain the process by which reproduction takes place in Hydra.
Marking-scheme solution
(A) (i)
Chemical Method/Oral pills Side effects: Change the hormonal balance of the body.
(a) Reproductive part - Sporangia
(b) Non-reproductive part - Hypha/Hyphae.
Dry slice of bread does not provide moisture and nutrients necessary for the germination and multiplication of Rhizopus.
(ii)
Alternate answer:[Budding:
Hydra uses regenerative cells for reproduction. A bud develops as an outgrowth due to repeated cell division at one specific site and develop into tiny individuals. On maturation, these buds detach from the parent and become new individuals.
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CBSE Class 10 Science past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.