Basic Science For class 7 Amarnath mishra,PHD Geeta Mehta ,PHD Deepti lehri,PHD Rajesh Mohan, Phd

 Biology ch -17 

Forests 

         EXERCISE 

A. Answer the following in not more than 20words.

Questions

 1.Name five forest products. 

 Short Answer 

 Five forest products are timber, paper, medicinal plants, resins, and mushrooms.

 2. How do forests check pollution? 

 Short Answer 

 Forests check pollution by acting as natural filters, absorbing and neutralizing pollutants in the air and water.

 3. How do forests regulate temperature? 

 Short Answer 

 Forests regulate temperature by providing shade, evapotranspiration, and maintaining a cooler microclimate.

 4. What do you understand by the term 'extinct? 

 Short Answer 

 Extinct refers to a term used to describe a species that no longer exists.

 

 5. How do forests help to maintain the balance of gases in the air? 

 Short Answer 

 Forests help to maintain the balance of gases in the air by absorbing carbon dioxide through the process of photosynthesis and releasing oxygen.

B. Answer the following in not more than 40words.

Questions

 1. In what ways do tribals and others living near forests benefit from forests? 

 Short Answer 

 Tribals and others living near forests benefit from forests in multiple ways, including food and water resources, medicinal plants, livelihood opportunities, cultural and spiritual practices, and a sense of community and belonging.

 2. How do forests help control floods? 

 Short Answer 

 Forests help control floods by acting as natural sponges, absorbing rainfall and reducing runoff.

 3. What impact do forests have on rainfall and groundwater resources? 

 Short Answer 

 Forests play a critical role in both rainfall patterns and groundwater resources.

 4. How do forests help protect soil? 

 Short Answer 

 Forests protect soil by providing a protective cover, preventing erosion, promoting the formation of organic matter, and improving water infiltration.

C.Answer the following in not more than 60words.

Questions

 1. How do the plants of a forest help other organisms? 

 ShortAnswer 

 The plants of a forest help other organisms by providing them with food, shelter, and oxygen.

 2. What impact does deforestation have on the animals living in forests? 

 ShortAnswer 

 Deforestation has adverse impacts on animals living in forests, leading to habitat loss, decreased food availability, disruption of migration patterns, and an increased risk of extinction.

 D. Match the columns A and B.

     A.                                  B

  

      (a)Cane.                 (I)paper

       

         (b) Eucalyptus     (ii) oil

     (c) Coniferous trees (iii)tyres 

(d) Rubber tree.          (iv)Gum

(e)Babool.                    (v)Furniture 

 Short Answer 

 (a) Cane - (iv) Gum

(b) Eucalyptus - (ii) Oil

(c) Coniferous trees - (i) Paper

(d) Rubber tree - (iii) Tyres

(e) Babool - (v) Furniture