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प्रश्न
Define the following:
Gestation
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उत्तर
Gestation: The period in which an embryo develops in the uterus is called gestation.
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संबंधित प्रश्न
What are sexually transmitted diseases?
What are the different methods of contraception?
Where is the female gamete formed in humans?
What do the testes in a man produce?
Name the organs which produce ova (or egg cells) in human females.
Which of the following is not a sexually transmitted disease?
(a) gonorrhoea
(b) hepatitis
(c) syphilis
(d) AIDS
When a female child is born, her ovaries already contain thousands of immature eggs (or ova) contained in immature structures A. On maturing, A bursts open and an egg shoots out of the ovary in a process called B. The process B starts in the females at puberty and occurs again and again after a time period x. Before every occurrence of process B, the inner lining of uterus becomes thick and soft with lots of blood vessels in it. When the egg cell gets fertilised by a sperm, then an event C occurs in the life of mature human female which lasts for time period y leading to the birth of baby. If, however, the egg cell released by the ovary does not get a sperm to fuse with, then the thick and soft inner lining of uterus breaks down and comes out of the female's body in an event called D. The occurrence of event D is controlled by chemical substances E.
(a) What are A?
(b) What is process B?
(c) What is the time period x?
(d) Name the event C.
(e) How much is the time period y?
(f) What is the name of process D?
(g) Name the chemical substances E.
Gender of child is determined by the male partner of couple. Explain with reasons whether this statement is true or false.
Give Reasons
At the time of birth, the testes descend into the scrotal sacs.
Distinguish between Vasa efferentia and Vasa deferentia.
