Secondary School (English Medium) (5 to 8) इयत्ता ८ - CBSE Question Bank Solutions for Science

Write a paragraph in your own words of the following.

Threshing

Why should paper be saved? Prepare a list of ways by which you can save paper.

State whether the following statement is True or False. Correct the false statement.

Freshly harvested grains must be dried before storing

Paddy is a major cereal crop in our country.

1. In which season is paddy cultivated?
2. Discuss the method of sowing.
3. What measures must be taken to prevent spoilage and insect attack of harvested grains?

Why should we save paper?

Identify the correct statement.

Amoeba and Paramecium belong to which category of organisms?

Observe the vessels A, B, C and D as shown in figure carefully.

300 mL	50 mL	500 mL	60 mL
A	B	C	D

The town hall building is situated close to Boojho’s house. There is a clock on the top of the town hall building which rings the bell every hour. Boojho has noticed that the sound of the clock appears to be much clearer at night. Explain.

Which of the following procedures will give you water free from all impurities?

Fill in the blanks with the help of words given in bracket after the sentence.

Water which looks clean still has disease carrying ______ and ______ impurities.

(insects, microorganisms, particles, dissolved, harmful)

Find out the wrong statement and write it in its correct form.

Chlorination is a commonly used chemical method for killing germs in water.

Find out the wrong statement and write it in its correct form.

Water that is suitable for drinking is called soft water.

Explain the traditional ways of purifying water to make it fit for drinking.

How can you contribute to the maintenance of green wealth of your locality? Make a list of actions to be taken by you.

Make sketches of animal and plant cells. State three differences between them.

When we press the bulb of a dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is due to

State whether the following statement is true (T) or False (F): 

Protoplasm is the part of the cell which surrounds the nucleus.

State whether the following statement is true (T) or False (F): 

Plant cells contain large vacuoles.

Chloroplast : photosynthesis :: mitochondria : ______.