Question

Q.7 Answer the following questions.
1. What is solar system?
2. What are satellites? Name the natural satellite of the Earth.
3. Why is Mars called the red planet?
4. Explain chlorination and filtration.
5. Why morning and evening are cooler than noon time?
6. Explain gravity with the help of an example,
7. What is force? What are the uses of force?
8. What is photosynthesis?
9. What are the functions of a leaf?​​​​

Answer 1

Answer:

1.

the collection of eight planets and their moons in orbit round the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets. The planets of the solar system are (in order of distance from the sun) Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune

2.The Moon is Earth's only proper natural satellite. At one-quarter the diameter of Earth, it is the largest natural satellite in the Solar System relative to the size of its planet, and the fifth largest satellite in the Solar System overall.

Distance to Earth: 384,400 km

Gravity: 1.62 m/s²

Radius: 1,737.1 km

Age: 4.53 billion years

Orbital period: 27 days

Orbits: Earth

3.Mars is sometimes called the Red Planet. It's red because of rusty iron in the ground. Like Earth, Mars has seasons, polar ice caps, volcanoes, canyons, and weather. It has a very thin atmosphere made of carbon dioxide, nitrogen, and argon.

4.Microorganisms can be found in raw water from rivers, lakes and groundwater. ... Along with other water treatment processes such as coagulation, sedimentation, and filtration, chlorination creates water that is safe for public consumption. Chlorination is one of many methods that can be used to disinfect water.

5.Because in afternoon the sun is on the top and the rays of sunshine comes direct to the earth so we feel warmer and in morning and evening the sun is slightly to the earth so we feel colder then afternoon.16-Jan-2020

6.Some examples of the force of gravity include: The force that holds the gases in the sun. The force that causes a ball you throw in the air to come down again. The force that causes a car to coast downhill even when you aren't stepping on the gas. The force that causes a glass you drop to fall to the floor.

7.the process by which green plants turn carbon dioxide and water into food using energy from sunlight.The main function of a leaf is to produce food for the plant by photosynthesis. Chlorophyll, the substance that gives plants their characteristic green colour, absorbs light energy.

8.