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प्रश्न
The energy in petrol originally came from the sun. Explain how it got into petrol.
उत्तर
We know that green plants use the energy from sunlight for photosynthesis and growth. They store this energy in the form of carbon compounds. Thus, every leaf and every bit of wood in plants and trees is made using the energy from sunlight. Animals eat plants for energy, which is originally received from sunlight. These plants and animals die and their remains get converted into coal and petrol, respectively, which are energy-rich compounds of carbon that were made by plants using solar energy.
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संबंधित प्रश्न
On what basis would you classify energy sources as
(a) renewable and non-renewable?
(b) exhaustible and inexhaustible?
Are the options given in (a) and (b) the same?
What is the difference between a renewable and a non-renewable source of energy? Explain with examples.
Name the component which is found in natural gas well as in biogas.
The pollution of air caused by burning petroleum fuels (like petrol and diesel) in vehicles can be controlled by fitting a device X in the exhaust system of vehicles.
How does this device help in controlling air pollution?
What is meant by the renewable and non-renewable sources of energy? State two differences between them, giving two examples of each
Renewable source of energy is :
What are the environmental consequences of using fossil fuels? Suggest the steps to minimise the pollution caused by various sources of energy including non-conventional sources of energy.
Fill in the blanks in the following sentence.
Coal is one of the ______ used to cook food.
Fill in the blanks and complete the story.
About 300 million years ago, the earth had dense ______ in low lying wetland areas. Due to natural processes like ______ these forests got buried under the ______ As more ______ deposited over them, they were compressed. The ______ also rose as they sank deeper and deeper. Under high ______ and high ______ , dead plants got slowly converted into coal.
Complete the crossword in figure with the help of the clues :
Across
1. Fuels obtained from dead remains of living organisms. (6, 5)
2. A process by which the various constituents of petroleum are separated. (8)
3. A porous black substance obtained from coal. (4)
4. Another name for motor fuel. (6)
Down
5. The substance obtained by carbonisation. (4)
6. Fuel for heavy motor vehicles. (6)
7. A petroleum product used for road surfacing. (7)
8. Dead remains of sea animals got converted into it. (9)
