NCERT solution for class 7// Science // Chapter 17 - Forest our lifeline

 NCERT solution >  Class 7 >  Science 

NCERT solution for class 7// Science  // Chapter 17 -   Forest our lifeline

Chapter 17 -   Forest our lifeline 

Exercise 

Q1. Explain how animals dwelling in the forest help it grow and regenerate.? 

Answer-  In forest the animals are various types they may be herbivorous carnivorous omnivorous and microorganisms all they play important role in the maintaining of food chain 

  • Microorganism convert the dead plants and animals into humus and return back the nutrients into the soil 
  • Animals also help in the dispersing of seed of some plants 
  • The animal waste material also provide the nutrients to the soil all these activities of animals dwelling in the forest help to grow and regenerate

Q2. Explain how forests prevent floods? 

Answer-  The roots of the forest trees hold the soil particles and they are also helpful for the seepage of water inside it and reduces the flood condition

Q3. What are decomposers name any two of them what do they do in the forest ?

 Answer- The microorganism which convert the dead plants and animals to humans are known as decomposers 

Bacteria, fungi are decomposers . Decomposers decompose the organic matter of dead plants and animals and convert it into humus and recycle the nutrients

Q4. Explain the role of forest in maintaining the balance between Oxygen and carbon dioxide in the atmosphere ? 

Answer- Plants in the forests are consume carbon dioxide from atmosphere and used for photosynthesis and they release oxygen from same process and this help in the balancing of Oxygen and carbon dioxide in atmosphere

Q5. Explain why there is no waste in the forest? 

Answer- There is no waste in the forest because the waste is a organic matter and which is gets converted into you must by the action of decomposers

Q6. List five products we get from forest? 

Answer- 1. Food materials 

2. Timber 

3. Medicine 

4. Gum 

5. Wood for fuel 

Q7.  Fill in the blanks 

a) The insects butterflies honey bees and birds help flowering plants in pollination. 

b) A forest is a purifier of of air  and water 

c) Herbs from  lowest layer in the forest .

d) The decaying leaves and animals dropping in a forest enrich the soil.

Q8. Why should we worry about the conditions and issues related to forest for from us ?

Answer- We should worry about the forest for following reasons 

a) Decrease in the forest is result increases the global warming and imbalance of Oxygen and carbon dioxide 

b) Deforestation occurs result in soil erosion .

c) Deforestation also reduces the biodiversity and convert the soil into  barren called desertification .

Q9. Explain why there is a need of variety of animals and plants in a forest

Answer-  Variety of the plants and animals present in the forest help to regenerate and grow the help to  maintain different Types of food chain decomposers are convert the dead plants and animals into humus and maintain the nutrient recycling

Q10. In figure the artist has forgotten to put the labels and directions on the arrows mark the directions on the arrows and label the diagram using the following labels clouds rain atmosphere carbon dioxide and oxygen plants animals soil roots , water table .

Answer-  


Q11. Which of the following is not a forest product 

a)  gum    b) plywood     c ) sealing wax 

d)  kerosene . 

Answer- Kerosene

Q12. Which of the following statement is not correct 

a) forest protect the soil from erosion .

b) plants and animals in a forest are not dependent on one another .

c) forest influences the climate and water cycle .

d) soil helps  forest to grow and regenerate ? 

Answer- Plants and animals in a forest are not dependent on one another .

Q13. Microorganism act upon the dead plants to produce .

a) sand   b) mushrooms    c) humus     d) wood  

Answer- Humus.


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