Fill in the following blanks with suitable words:
(f) The onset of puberty is controlled by .

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Solution

$∙$ The period during which adolescent boys and girls reach sexual maturity and become capable of reproduction is called puberty.
$∙$ The changes that occur during puberty is brought about by sex hormones.

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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___

(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) 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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