NCERT Solutions for Class 8th Science
Chapter 7. Conservation of Plants And Animals
Additional Questions With Solutions
Conservation of Plant and Animals
Ques: What are the main causes of deforestation?Ans: The main causes of deforestation are as below;
(i) Procuring land for cultivation.
(ii) Building houses and factories.
(iii) Making furniture or using wood as fuel
(iv) Heavy droughts
Ques: What is deforestation?
Ans: Completely destroying the forest for fulfilling the specific purpose of wood or land is known as deforestation.
Ques: What results may occur of deforestation?
Ans: Results of deforestation;
(i) Deforestation increases the temperature and pollution level on the earth.
(ii) It increases the level of carbon dioxide in the atmosphere.
(iii) Ground water level also gets lowered.
(iv) Deforestation disturbs the balance in nature.
(v) Cutting of trees continues, rainfall and the fertility of the soil will decrease.
(vi) Three will be increased chances of natural calamities such as floods and droughts.
Ques: What is the cause of droughts?
Ans: The increase in temperature on the earth disturbs the water cycle and may reduce rainfall. This could cause droughts.
Ques: Name that gas which absorbs heat radiations produced by the earth.
Ans: Carbon dioxide.
Ques: Define desertification.
Ans: Gradually the fertile land gets converted into deserts. It is called desertification.
Ques: What is Sanctuary?
Ans: Areas where animals are protected from any disturbance to them and their habitat.
Ques: What does biodiversity mean?
Ans: Biological diversity or biodiversity refers to the variety of organisms existing on the earth, their interrelationships and their relationship with the environment.
Ques: What are biosphere reserves the areas meant?
Ans: Biosphere reserves are the areas meant for conservation of biodiversity.
Ques: Define Biosphere Reserve.
Ans: Large areas of protected land for conservation of wild life, plant and animal resources and traditional life of the tribals living in the area.
Ques: What is national park?
Ans: National Park : Areas reserved for wild life where they can freely use the habitats and natural resources.