Question

Name any two copper releasing intra-uterine devices. State two reasons that make them effective contraceptives. OR Name any two outbreeding devices…

Accepted Answer

(a) Copper releasing IUDS – CuT, Cu-7, Multiload – 375 Cu+ released from IUDs suppress sperm motility, reduces fertilising capacity of sperms, increase phagocytosis of sperms OR (b) - Unisexuality - production of unisexual flowers, prevent self pollination, - Release and receptivity of stigma are not synchronized, either pollen is released before the stigma becomes receptive or stigma becomes receptive much before the release of pollen, - Anther and stigma are placed at different positions, so that the pollen cannot come in contact with stigma, - Self-incompatibility/genetic incompatibility, genetic mechanism and prevents self- pollen from fertilizing the ovule by inhibiting pollen germination or pollen tube growth in the pistil.

Name any two copper releasing intra-uterine devices. State two reasons that make them effective contraceptives.

Marking-scheme solution

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(a)OR(b)Name any two copper releasing intra-uterine devices. State two reasons that make them effective contraceptives.Name any two outbreeding devices that flowering plants have developed and explain how they help in encouraging cross-pollination.

Marking-scheme solution

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Name any two copper releasing intra-uterine devices. State two reasons that make them effective contraceptives.