• Biology - Section 1

Ordinary table salt is sodium chloride. What is baking soda?

A. Potassium chloride
B. Potassium carbonate
C. Potassium hydroxide
D. Sodium bicarbonate


Ozone hole refers to

A. hole in ozone layer
B. decrease in the ozone layer in troposphere
C. decrease in thickness of ozone layer in stratosphere
D. increase in the thickness of ozone layer in troposphere


Pine, fir, spruce, cedar, larch and cypress are the famous timber-yielding plants of which several also occur widely in the hilly regions of India. All these belong to

A. angiosperms
B. gymnosperms
C. monocotyledons
D. dicotyledons


Plants receive their nutrients mainly from

A. chlorophyll
B. atmosphere
C. light
D. soil


Movement of cell against concentration gradient is called

A. osmosis
B. active transport
C. diffusion
D. passive transport