LONG ANSWER TYPE QUESTIONS
Q. 1. What do you mean by deforestation? Explain the
(i) Man-made cause of deforestation
(ii) Natural causes of deforestation.
Ans. The cutting of trees or forest lands being cleared for other purposes like urbanisation and industrialisation is called deforestation.
(i) Man-made cause of deforestation:
(i) Forest land is used for urbanisation.
(ii) As the population grows, the industries also grow.
(iii) Wood from forests is used for making furniture, doors and windows.
(iv) Wood of forest is also used as fuel.
(ii) Natural Causes of deforestation:
(i) Forest fires.
(ii) Severe droughts.
Q. 2. Explain the main consequences of deforestation.
Ans. There are following consequences of deforestation:
(i) Deforestation destroys the habitats of many organisms.
(ii) It causes various natural calamities like floods and droughts etc.
(iii) It reduces rainfall.
(iv) It causes global warming.
(v) It increases the amount of carbon dioxide and pollutes environment.
(vi) Oxygen and water level are decreased.
(vii) It causes soil erosion and desertification.
(viii) It creates imbalance between oxygen and carbon dioxide gases.
Q. 3. Make a list of threatened animals. Write their causes of becoming endangered.
Ans. (i) Blue Whale: Its oil and the blubber are used for making medicines, so it is endangered.
(ii) African Elephants: They are endangered because they are hunted for their ivory.
(iii) Sea Turtles: The turtles are used to make many things. Their shells are used to make jewellery, combs and sun glasses.
(iv) Bengal Tiger: Tiger is killed for its skin and bones.
(v) Black Rhino: It is mainly killed for its horn, which is used for making handles of daggers. The main cause of threat is the destruction of its habitats.