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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
Short Answer Question:
What is a planet?
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?
Name the planet closest to the Sun.
Which planet is known as the ‘red planet’?
Give a reason for the following:
Earth is called a “Watery Planet”
Give a reason for the following:
Earth has the most ideal temperature conditions.
Distinguish between inner and outer planets.
Name the planet having no satellite.
The living sphere.
What are the effects of rotation and revolution?
