Fill in the following blanks with suitable words:

The changes which occur in boys and girls at puberty are brought about by various .

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) 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.

What are the changes that happen in boys and girls at puberty physically and mentally?