A nine-year-old boy is 120 cm tall. If the present height of the boy is 75% of his full height,calculate the full height which the boy will eventually reach at the end of the growth period.
What name is given to those sexual characteristics in humans: (a) which are present in babies at birth? (b) which develop in mature boys and girls?
Name the hormone which develops secondary sexual characteristic: (a) in females (girls) (b) in males (boys)
Name the endocrine gland which controls the production of sex hormones ‘testosterone’ and ‘estrogen’.
What is the name of the process in which the thickened uterus lining along with its blood vessels is removed from the body of a woman through vaginal bleeding?
State whether the following statements are true or false (a) The estrogen hormone develops a deeper voice in males at puberty. (b) Menstruation stops in men permanently around the age of 45 to 50 years. (c) Man (father) is responsible for the sex of the body. (d) The sex chromosomes in all the gametes (sperms) of a man are not identical. \ (e) Half the female gametes contain X chromosomes and the other half contain Y chromosomes. (f) It is the sperm that determines the sex of a child. (g) Each normal cell in our body contains 23 chromosomes and the other half contain Y chromosomes. (h) A girl should not be allowed to work in the kitchen during menstruation. (i) A woman (mother) is responsible for the sex of her child. (j) Metamorphosis in insects (like silk moth) is brought about by thyroxine hormone.
Name the hormone which prepares our body for action to face emergency situation like danger, fear, anger or excitement.
Name the hormone which brings about metamorphosis in silk moth and changes caterpillar (larva) into adult silk moth.
Fill in the following blanks with suitable words (a) Sexual maturity is reached at_ (b) The changes which occur in boys and girls at puberty are brought about by various_ (c) Initially, girls grow_than boys. (d) The changes occurring in body and mind during adolescence are a natural part of_up. (e) The features which help us to distinguish between a mature boy and a girl are called_sexual characteristics. (f) The onset of puberty is controlled by_ (g) The menstrual cycle in women is controlled by_ (h) Each normal body cell in humans contains_pairs of chromosomes out of which_pair is of sex chromosomes. (i) X and Y chromosomes are called_chromosomes. (j) Early marriage and motherhood cause health problems in the _________and the_________ (k) The protective foods are _________ and _________ (l) Thyroid and adrenals secrete their hormones when they receive instructions from_________gland through its hormones. (m) Metamorphosis in amphibians is brought about by_________hormone.
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