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

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 : ______.

Given below is a conversation between two farmers Heera and Beera.

Heera : Brother Beera, your maize crops look beautiful. They have grown pretty fast.

Beera : Yes, I have sprayed urea this time. What about you?

Heera : Well, I am still relying on good old cow dung. I am saving money for buying a tractor.

Beera : That’s good. Tractor saves a lot of time and labour.

Heera : Yes, it’s been very labour intensive for me and now these weeds have come up.

Beera : Try weedicides, they are very effective.

Now, answer the following questions.

1. List the practices which are not environment friendly and why?
2. What is the advantage of modern agriculture implements over traditional ones?
3. Name one weedicide and the precaution, farmers must take during its application. 

Despite being one of the growing economies, our country still has a large section of population going hungry and malnourished. Do you think an efficient crop production mechanism is the only solution to this? Discuss in the class what else needs to be done to root out hunger and malnutrition from our country.

Which of the following feature will help you in distinguishing a plant cell from an animal cell?

What are the functions of cell wall in plant cells? 

Observe the following figure given below.

Answer the following questions.

1. Does it represent a plant cell or an animal cell?
2. Does it represent a prokaryotic cell or an eukaryotic cell?

Label the parts A to E in the given figure.

It is much easier to burst an inflated balloon with a needle than by a finger. Explain.

1 hertz is equal to

Ultrasound has frequency of vibration

Unwanted or unpleasant sound is termed as music.

Unwanted sound is called ______.

What is the difference between noise and music?

Name the practice followed for large scale rearing of farm animals.

What facilities are provided to farm animals?