Questions

India have the most population of tigers with 70% in the world tiger population.

Glass is made from heating of sand. To melt sand to make glass, the temperature needed is above 1800 deg celcius.

In DNA, adenine pairs with Thymine. Similarly, in RNA, due to absence of thymine in RNA and the same structure with uracil helps to pair with adenine.

Biological membranes are composed of phospholipids, Proteins and Carbohydrate groups attached to lipids and proteins.

Among the given options, CH4 is a non polar molecule with symmetrical tetrahedral shape.

The trick here is to follow the structure of the statement. The blank is followed by 'of' and thus the blank will take a filler that can be followed grammatically by 'of' and also manages to give a proper meaning. On the basis of these filters, none of the options except option 2 makes any sense.