CATEGORY A
CATEGORY B
CATEGORY C
100

The percentage of total water in ocean is 

97

100

The percentage of total water in Glaciers and ice caps is...

2

100

The percentage of groundwater is....

0.3

200

Which layer contains part of ionosphere.

Thermosphere

200

which layer contains the ozone layer.

Stratosphere

200

Which layer has the lowest temperature

Mesosphere

300

The earth average temperature  is 

15

300
The ozone layer filters ...

The ultraviolet radiation

300

The atmosphere also contains..., which is necessary for breathing.

oxygen

400

Water is the main component of ...

blood

400

Water is the habitat of many ...

organisms

400

Plant cells store water in a structure called... 

the central vacuole