Question

Q.7 Briefly write gamete transfer
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Answer 1

Answer:

Gamete intrafallopian transfer (GIFT): A technique in which the male and female germ cells required to begin formation of a human embryo are injected into a woman's fallopian tubes of the female for fertilization.

Explanation:

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Answer 2

Answer:

In seed-bearing plants, pollen grains are the carriers of male gametes and eggs are present in the ovule. Hence, pollen grains need to be transferred to the stigma to facilitate fertilization. In bisexual plants which show self-pollination, anthers and stigma are close to each other. Hence, transfer of pollen grains to the stigma is relatively easy in these plants. But in cross pollinating plants, pollen grains need the help of some agent of pollination to be transferred to the stigma. It is important to note that cross-pollinating plants can be monocious as well as dioecious.

Once pollen grains reach the stigma, they germinate to produce pollen tubes. Male gamete is then transferred to the ovule via pollen tube and ends up fertilizing the female gamete.

In dioecious animals; male and female gametes are formed in different individuals. Hence, such organisms need to evolve a special mechanism for gamete transfer. Fertilization is the most critical event in sexual reproduction, and successful transfer of gametes is necessary for this event to materialize.

Explanation: