Q6 of 28 Page 53

Structures present in a cell which is responsible for determination of the sex of a baby is

Sex chromosome present in the nucleus of a cell determines the sex of a baby. There are two types of sex chromosomes X and Y. If X bearing sperm fuses with ova which contain X chromosome then the baby will be a girl. But if Y bearing sperm fuses with ova containing X chromosome baby will be a boy.

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For the metamorphosis of tadpoles which of the following elements must be available in water?

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The most conspicuous visible change that occurs in boys during puberty is:

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Unscramble the underlined words in the following sentences.

(a) Reproductive life of a woman lasts from hacreemn to spauoemen.


(b) The development of a caterpillar to an adult butterfly is termed as poommertaissh.


(c) The overgrowth of sumselc in xalnyr leads to the hoarse voice in adolescent boys.


(d) Dannalier helps the body to adjust and fight the stress.

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Complete the following sentences.

(a) In females, the uterine wall thickens to receive the __________.


(b) Endocrine glands release hormones directly into _________for transportation to the __________.


(c) The sex hormones, _________________ and estrogen are responsible for the development of __________ characters.


(d) Release of sex hormones is under the control of a hormone secreted from the __________.