Windmills are used to produce______

Where the windmills are found is large numbers?

Among the following which is an inert gas?

Name the gas which released by man during expiration?

The gas used for respiration of living things is ______

The gas that is largely present is air is _______

Which gas is released by plants during photosynthesis?

Which gas is released by plants during night?

Choose the equipment that work by air pressure?

Which gas is used for the production of manure?