Question

Q. 2 A) Write answers of the following questions in one sentence. i) Which are various media of spreading the infectious diseases? ii) What is meant by valency of an element?​

Answer 1

i) Infectious diseases can spread through air, water, blood to blood contact, touch and animal vectors.

Example, Common cold- air, ring worm - touch or using clothes used by the infected person, Malaria through female Anopheles mosquito etc.

ii) The valence or valency of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules.

Answer 2

Answer:

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