Chapter 3 | Forests | Class-5 DAV Science Solutions

DAV CLASS 5 Science Solutions: We have discussed the solution of class 5 Science book chapter 3 Forests. Solutions are given below with proper Explanation please bookmark our website for further updates.

SOMETHING TO KNOW

A. Fill in the blanks :

1. Forests serve as home to many types forests absorb large amounts of

2. Deforestation rainfall in the surrounding areas.

4. is the largest bird sanctuary in Asia.

5. For early man, forests were a source of and

Ans. 1. animals 2. carbon dioxide 3. reduces 4. Bharatpur 5. food and shelter.

B. Match the following:

Column I	Column II
I. resins	(d) paint
2. forests	(c) soil conservators
3. deforestation	(a) cutting down of trees
4. ashwagandha	(e) medicinal plant
5. gums	(b) adhesives

C. Tick (✓) the correct option :

1. The leaf, used to make disposable plates, is the (a) tendu leaf (b) areca nut leaf (c) amla leaf (d) brahmi leaf

Ans. 1. (b) areca nut leaf

2. Deforestation results in (a) soil erosion (b) flood (c) low rainfall (d) all of the above

Ans: 2. (d) All of the above

3. Bee wax is used to make (a) spices (b) varnish (c) medicine (d) adhesive

Ans 3. (c) medicine

4. Which of the following is not a forest product? () gum (b) timber (c) ashwagandha (d) kerosene

Ans 4. (d) kerosene

5. If forests disappear, the amount of (a) carbon dioxide, in air, will decrease (b) oxygen, in air, will increase (c) carbon dioxide, in air, will increase (d) nitrogen, in air, will increase

Ans 5. (c) carbon dioxide, in air, will increase

D. Answer the following questions in brief :

1. Name any four products that are obtained from forests.

Ans. Wood, Medicinal plants, Spices, and Gum.

2. Why do some men cut trees?

Ans. Some men cut trees for their own selfish interests.

3. What is the Gir National Park famous for?

Ans. Asiatic Lion.

4. Name two migratory birds that visit Bharatpur Bird Sanctuary.

Ans. Siberian crane and Pelican.

5. What is the average temperature and annual rainfall needed for a forest to develop?

Ans. The temperature of more than 10°C and minimum rainfall of 200 mm.

E. Answer the following questions

1. List four harmful effects of deforestation.

Ans. Harmful Effects of Deforestation • Reduced rainfall in the surrounding area. • Increased levels of carbon dioxide which causes global warming. • Decreased level of groundwater which results in a shortage of drinking water. • Increase in soil erosion which results in more frequent floods.

2. How do forests prevent soil erosion?

Ans. Herbs, shrubs and trees in the forests hold the top most layer firmly by their roots. This does not allow natural forces like wind and water to carry away the top most fertile layer of the soil easily. Hence, forests prevent soil erosion.

3. State the importance of forests to human beings.

Ans. We get many products from forests; like wood, medicinal plants, honey, wax, resin, etc. Forests help in recharging the groundwater. Forests prevent soil erosion. Forests soak up carbon dioxide and release oxygen. Thus, forests maintain the balance in our environment.

4. Why are forests known as the ‘lungs of the earth’?

Ans. Forests soak up excess carbon dioxide from the atmosphere and release carbon dioxide. This is similar to the way our lungs work while removing carbon dioxide from the blood. Hence, forests are known as the ‘lungs of the earth’.

5. How can we contribute towards the protection of forests?

Ans. We can contribute in the following ways to conserve forests: • Minimise the use of wood and wood products. • Do not use products that promote the destruction of forests. Do not use fur because fur is obtained from animals. Do not use items made of ivory. • We should plant new trees and celebrate Van Mahotsava.