Q2 of 28 Page 53

AIDS can spread from an infected person to another person through

HIV virus is present in the blood of infected person so if this infected blood is transfused to a healthy individual there is a maximum chance of getting infected by this virus. This virus is also transmitted through shared injection needles, sexual contact, infected mother to child during pregnancy etc.

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1

The belief that the mother is completely responsible for the sex of the child is wrong because the child

 3

Given below are events that lead to pregnancy and development of the embryo.

(i) Fertilization of egg


(ii) Maturation of egg


(iii) Release of egg


(iv) Embedding of the embryo in the thickened uterine wall.


Which of the following options gives the correct order of sequence in which they occur?

 4

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

 5

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