Questions

3MHz is the maximum clock frequency for 8085.

A mountain is what has roots that nobody sees, Is taller than trees, Up, up it goes, Yet it never grows.

Black

United States and Russia have together almost 400 billion tones. Which represents nearly 50% of world's reserves of coal.

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

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.

Humming bird is the smallest bird and the only bird which can fly in backwards in the world.