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प्रश्न
During adolescence, several changes occur in the human body. Mark one change from the following associated with sexual maturation in boys.
पर्याय
loss of milk teeth
increase in height
cracking of voice
weight gain
उत्तर
cracking of voice
Explanation:
Cracking of voice in males is brought about by the male hormone testosterone, which is produced after sexual maturation.
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संबंधित प्रश्न
Name the parts of the human female reproductive system where
i. fertilisation takes place
ii. implantation of the fertilised egg occurs
Name the respective part of human female reproductive system:-
(i) that produces eggs,
(ii) where fusion of eggs and sperm takes place, and
(iii) where zygote gets implanted.
Which of the following is not a part of the female reproductive system in human beings?
State the changes that take place in the uterus when Implantation of embryo has occurred
Describe in brief the structure of placenta
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?
Write the functions of secretions of prostate gland and seminal vesicles in humans.
State whether the following statement is true or false:
Oviducts and fallopian tubes are one and the same thing.
Define the following:
Clone
Given below is a group of terms. In the group, one pair indicates the relationship between the two terms. Rewrite and complete the second pair on a similar basis.
Female gonad : Ovaries :: Male gonad : ______.
