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Biology · 2025 · 2 marks
CBSE 2025 · Region 4 · Set 2 · Q21
(a) Write two features of an ideal contraceptive. Explain any one natural contraceptive method that makes the chances of conception almost nil.
(a)
Write two features of an ideal contraceptive. Explain any one natural contraceptive method that makes the chances of conception almost nil.
OR
(b)
Explain GIFT and ICSI.
Marking-scheme solution
(a)
• User-friendly,
easily
available,
effective,
reversible, no or least side effects, should not interfere with the sexual drive or desire and/or the sexual act of the user, any other correct feature.
•
− Periodic abstinence, couples avoid or abstain from coitus from day $\displaystyle 10$ to $\displaystyle 17$ of the menstrual cycle.
− Withdrawal or coitus interruptus, the male partner withdraws his penis from the vagina just before ejaculation.
− Lactational amenorrhea, after parturition when mother breast feeds the child intensely ovulation does not occur thus menstrual cycle also not occurs.
or
(b)
• GIFT : Transfer of an ovum collected from a donor into
the fallopian tube of another suitable female.
• ICSI: Sperm is directly injected into the ovum in vitro
to form an embryo
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.