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प्रश्न
Give appropriate biological/technical terms for the following:
The kind of twins formed from two fertilized eggs.
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उत्तर
Fraternal twins
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संबंधित प्रश्न
What is a placenta?
Which part of the human body produces ova?
Which structures in human female are equivalent to the following structures in the male?
- testes
- vas deferens
- penis
In each case say in what respect the structures are equivalent?
Describe the process of fertilisation in humans and development of embryo briefly.
When a fertilised egg E formed in the oviduct of a human female divides repeatedly to form an embryo, the embryo gets implanted in the thick and soft lining of the uterus. After this a disc-like special tissue T develops between the uterus wall and embryo through which all the requirements of the developing embryo (and foetus) are met from the mother's body, The embryo is connected to the tissue T through a string like structure S.
(a) What is the other name of fertilised egg cell E?
(b) What is the name of tissue T?
(c) Name the string-like structure S.
(d) Name two substances which pass from mother's blood to embryo through tissue T and, one type of substance which passes from embryo to mother's blood.
(e) What happens to S when the baby is born? Why?
Pollen grains are formed by ______ division in locules of anthers.
Choose the Odd One Out:
Choose the Odd One Out:
The mature sperms are stored in the ____________.
Which stage of human reproduction involves the fusion of sperm and egg to form a zygote?
