Sperm or male gamete fuses with egg or female gamete because of the attraction of their protoplast. Some chemicals are secreted by ovule or egg wall to attract the male gamete or sperm.

Correct Option: D

Sperm or male gamete fuses with egg or female gamete because of the attraction of their protoplast. Some chemicals are secreted by ovule or egg wall to attract the male gamete or sperm.

In human beings, after one month of pregnancy, the embryo’s heart is formed. By end of second month pregnancy, the foetus develops limbs and digits. By end of 12 weeks, major organ systems are formed. After fifth month, the first movement of foetus and appearance of hair on its head are observed. By the end of 24 weeks, the body is covered with hairs, eye lids separate and eyelashes are formed.

Correct Option: B

In human beings, after one month of pregnancy, the embryo’s heart is formed. By end of second month pregnancy, the foetus develops limbs and digits. By end of 12 weeks, major organ systems are formed. After fifth month, the first movement of foetus and appearance of hair on its head are observed. By the end of 24 weeks, the body is covered with hairs, eye lids separate and eyelashes are formed.

Morula is a solid ball contained within the zone pellucida. It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA.

Correct Option: A

Morula is a solid ball contained within the zone pellucida. It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA.

Foetal ejection reflex in human female is induced by fully developed foetus and placenta. When a woman is in a lithotomy or semi-sitting position, the Foetal Ejection Reflex is impaired and the increased pain caused by the sacrum’s inability to move as the baby descends can be intolerable.

Correct Option: B

Foetal ejection reflex in human female is induced by fully developed foetus and placenta. When a woman is in a lithotomy or semi-sitting position, the Foetal Ejection Reflex is impaired and the increased pain caused by the sacrum’s inability to move as the baby descends can be intolerable.

Amnion is an extraembryonic membrane in human prevents desiccation of the embryo inside the uterus. Amnion is a membrane that encloses the embryo of reptiles, birds and mammals within the amniotic cavity. This cavity is filled with amniotic fluid, in which the embryo is protected from dessication and external pressure.

Correct Option: D

Amnion is an extraembryonic membrane in human prevents desiccation of the embryo inside the uterus. Amnion is a membrane that encloses the embryo of reptiles, birds and mammals within the amniotic cavity. This cavity is filled with amniotic fluid, in which the embryo is protected from dessication and external pressure.