Q. 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.
