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प्रश्न
Tick (√) the most appropriate answer.
The humans pollute the air by :
विकल्प
burning a vast amount of coal
burning waste materials
using petrol and diesel vehicles
all the above
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उत्तर
all the above
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संबंधित प्रश्न
Write down the composition of three main gases present in air by volume.
Give two examples of modern fuels.
State the utility of oxygen for respiration in plants
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
The mesosphere in the atmosphere, contains most of the air, fit for respiration
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
Photosynthesis is a process by which green plants prepare their own food in the presence of sunlight and chlorophyll.
Explain why during an incident of fire, one is advised to wrap a woollen blanket over a burning object.
How to show the presence of carbon-di-oxide in the air?
The composition of air changes slightly from place to place. Give examples.
Nitrogen is an essential element present in proteins and nucleic acids which are the building blocks of living things.
On a Sunday morning Paheli’s friend visited her home. She wanted to see some flowering plants in the nearby garden. Both of them went to the garden. While returning from the garden they also observed some flowering plants on the road side. But to their surprise they found that the leaves and flowers of these roadside plants were comparatively very dull. Can you help them to know why?
