Secondary School (English Medium) (5 to 8) Class 8 - CBSE Question Bank Solutions for Science

Write a short paragraph on the harmful effects of microorganisms.

Fill in the blanks with appropriate words.

Like synthetic fibres, plastic is also a _______

Explain why plastic containers are favoured for storing food.

Explain the difference between thermoplastic and thermosetting plastics.

Explain why the following is made of thermosetting plastics.

Saucepan handles

Give examples to show that plastics are non-corrosive in nature.

Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.

Describe an activity to show that thermoplastic is a poor conductor of electricity.

Name the petroleum product used for surfacing of roads.

Process of separation of different constituents from petroleum is called ______.

Kerosene is not a fossil fuel.

Explain the process of formation of petroleum.

Explain how the use of CNG in automobiles has reduced pollution in our cities.

Compare LPG and wood as fuels.

A place where animals are protected in their natural habitat is called ______.

Species found only in a particular area is known as ______.

Migratory birds fly to far away places because of ______ changes.

Differentiate between the following.

Endangered and extinct species

What will happen if the habitat of an animal is disturbed?

Complete the world puzzle.

Down

1. Species on the verge of extinction.

2. A book carrying information about endangered species.

5. Consequence of deforestation.

Across

1. Species which have vanished.

3. Species found only in a particular habitat.

4. Variety of plants, animals and microorganisms found in an area.