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प्रश्न
State three factors which have made life possible on the Earth and on no other planet.
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उत्तर
The factors which have made life possible on earth and on no other planet are as follows :
- Earth is the only planet in the Solar System which is neither too hot nor too cold.
- The atmospheric blanket around the earth protects it from ultra-violet and other deadly sun rays.
- The mixture of gases in the atmosphere is suited to the growth and survival of life.
- Plants, through the process of photosynthesis, take away carbon dioxide from the atmosphere and make oxygen available for animals to breathe.
- Oceans play a great supporting role. They cover three-fourths of the earths surface and are responsible for the operation of the hydrological cycle which makes water on land surface available.
- Circulation of many life cycles not make energy and food available but also process the wastes which otherwise would harm life.
संबंधित प्रश्न
Study the picture and answer the questions that follow.
(a) What is meant by the Solar System?
(b) Give two differences between a planet and a star.
(c) Name the planets known as terrestrial planets.
(d) Give two advantages the earth has over other planets.
(e) What are satellites?
Which planet is known as the ‘red planet’?
Which star is known as ‘Evening Star or “Morning Star”?
Arrange the nine planets of the solar system in order of their sizes.
Give reasons for the following:
Pluto is the coldest planet.
Why is Mercury the hottest planet of the Solar System?
Describe the position of the Earth in the Solar System.
What is meant by Summer Solstice?
Earth is inclined by ______ degrees.
________ Percentage of our earth is covered by saltwater.
