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Question

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.


Solution

(a) puberty
(b) hormones
(c) faster
(d) growing
(e) secondary
(f) hormones
(g) hormones
(h) 23; 1
(i) sex
(j) mother; child
(k) fruits; vegetables
(l) pituitary 
m) thyroxine


Biology
Science for Eighth Class
Standard VIII

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