Science and Technology 10 most important questions for Board exam March 2018.

(ii) How many pairs of chromosomes are there in human beings?

(v) Explain the process of fertilisation, development and birth in human beings.

(vii) State four most common electrical appliances based on heating effect of electric current. Why do we use finely heated platinum wire in surgery?

(viii) What major harms are done to human beings due to air pollution?

(ix) Metal A has electronic configuration (2, 8, 1) and metal B has (2, 8, 8, 2). Which is more reactive? Why? Identify these metals. 

(x) Define Heredity. Give two examples.