Name the hormone which brings about metamorphosis in silk moth and changes caterpillar (larva) into adult silk moth.

Name the hormone whose deficiency causes diabetes.

Name the hormone which is required for the metamorphosis of larvae (tadpoles) into adult frogs.

State whether the following statements are true or false:

(a) The estrogen hormone develops 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 which 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.

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.