BIOLOGY 5 Marks Questions

1. Surgical methods of contraception prevent the flow of gamete during intercourse.
2. All sexually transmitted diseases are not completely curable.
3. Oral pills are very popular contraceptives among the urban women.
4. In E.T. technique, 8 celled embryos are transferred into the fallopian tube while more than 8 celled embryos are transferred into the uterus.

Some methods to assist infertile couples to have children are:

• Test tube baby programme:

The ova from the wife/ donor (female) and sperms from the husband/ donor (male) are collected and are induced to form zygote under simulated conditions in the laboratory. Then, zygote produced is then transferred into the fallopian tube of a normal female.

• Gamete Intra fallopian transfer (GIFT):

Transfer of an ovum collected from a donor into the fallopian tube of another female who cannot produce ova, but can provide suitable environment for fertilisation.

• Intra cytoplasmic sperm injection (ICSI):

A sperm is directly injected into the ovum.

• Artificial insemination (Al):

The semen collected either from the husband or a healthy donor is artificially introduced either into the vagina or into the uterus of the female.