STD 3,CHAPTER 4: IMPORTANCE OF PLANTS, EXTRA QUESTIONS AND ANSWERS

 

1.      In which forms, do we get food from plants?

Ans: We get food from plants in the form of fruits, vegetables, pulses and grains.

2.      Name some useful products that we get from plants?

Ans: We get wood, paper, rubber, cotton, oils and spices from plants.

3.      Name some plants which are used to make medicines.

Ans: Tulsi, Neem, Ginger and garlic are used to make medicines.

4.      How plants are useful for us?

Ans: i) Plants provide us food in the form of fruits, vegetables, pulses and grains.

ii) Plants give us wood, paper, rubber, cotton, oils and spices.

iii) Some plants like tulsi, neem, ginger and garlic, are used to make medicines.

iv) Plants give us oxygen.

v) Plants also help in soil conservation.

5.   Which gas is required for breathing?

Ans: Oxygen gas is required for breathing.

6.      What do you mean by a purifier?

Ans: Something which helps in removing impurities, is called as a purifier.

7.      How do plants act as air purifiers?

Ans: Plants give out oxygen gas during the day. This helps to increase the amount of oxygen in the air and, thereby, purifies it. Hence, plants act as air purifiers.

8.      How do plants help the soil?

Ans: Plants bind the soil with the help of their roots. So, plants help in soil conservation.

9.      What is deforestation? Is it good or bad for all of us?

Ans: Cutting down of trees is called as deforestation. It is bad for all of us.

10.  Write any two ill-effects of deforestation.

Ans: i) Due to deforestation, animals are not getting shelter.

ii) Quantity of oxygen is also decreasing in the atmosphere.

11.  What is afforestation?

Ans: Planting new trees is called afforestation.

12.  Mention any two benefits of afforestation.

Ans: i) Due to afforestation, animals will get their shelter.

ii) We will get purified air.

13.  Suggest some ways that can help to conserve plants.

Ans: i) We should only use those branches and leaves that have fallen down.

ii) We should put a ban on deforestation.

iii) We should promote afforestation.

iv) We should take full care of the saplings.

v) We should take steps to protect forests against forest fires. 

14. Suggest how one can take care of the saplings planted by him/her?

Ans: i) We should water the saplings regularly.

ii) We can use compost for the better growth of the saplings.

iii) We should protect the saplings from insects and other animals who can harm it.

15. Name the oldest living tree.

Ans: Tjikko is the oldest living tree. (It is 9,550 years old)