DAV Class 8 SST Solution Chapter 3 Natural Resources Vegetation and Wildlife
DAV School Books Class 8 SST Solution Chapter 3 Natural Resources Vegetation and Wildlife all Question Answer. DAV Class 8 3rd Chapter Natural Resources Vegetation and Wildlife full Chapter explanation by expert teacher.
DAV School Books Class 8 SST Solution Chapter 3 Natural Resources Vegetation and Wildlife:
(A) Tick the correct option-
(1) Which term is used for the plant community which grows without human interference?
(a) Plantation
(b) Natural Vegetation
(c) Agriculture
(d) Gardening
Ans: (d) Gardening
(2) Which vegetation grows in hot and humid regions of the world?
(a) Tropical Evergreen Forests
(b) Tropical Deciduous Forests
(c) Mediterranean Forests
(d) Temperate softwood forests
Ans: (a) Tropical Evergreen Forests
(3) The most common trees of Tropical Deciduous Forests are-
(a) Ebony and mahogany
(b) Sal and Teak
(c) Cork and Olive
(d) Oak and Chestnut
Ans: (b) Sal and Teak
(4) Trees of Mediterranean Forests are have-
(a) Broad Leaves
(b) Needle shaped leaves
(c) Spiny and waxy leaves
(d) Small size leaves
Ans: (a) Broad Leaves
(5) The area under forests is depleting due to-
(a) Natural Calamity
(b) Human Interference
(c) Climatic change
(d) Water shortage
Ans: (b) Human Interference
(B) Fill in the blanks.
(1) The assemblage of plant species in an environment is known as ___________.
Ans: natural vegetation.
(2) ___________ and ___________ are two important factors for the plant growth.
Ans: Temperature, rain fall.
(3) Humus helps to maintain ___________ of the soil.
Ans: fertility.
(4) Hardwood trees have broad leaves to permit ___________ of surplus moisture.
Ans: transpiration.
(5) Teak is the commercially important tree of the ___________ forests.
Ans: Tropical Deciduous.
(C) Write a technical term or an appropriate word for each of the following statements.
1.) The forests which do not shed all their leaves at the same time.
Ans: Tropical Evergreen Forests
2.) In this forest, summers are dry and moderate rain falls in winter.
Ans: Mediterranean Forests
3.) Conical shaped trees are common in these forests.
Ans: Temperate Softwood Forests
4.) The act or process of creating new forests by planting saplings.
Ans: Afforestation
5.) The Temperate Softwood Forests found in the southern slopes of Himalayas.
Ans: Mountain Forest
(D) Answer the following questions in brief-
(1) Why are the Tropical Rain Forests known as evergreen forests?
Ans: Tropical rain forests are known as evergreen forests because the trees of these forests remain green always due to not shedding leaves at the same time.
(2) Why do the Tropical Deciduous Forests shed their leaves during the summer season? Name two such trees.
Ans: Tropical deciduous trees are mainly monsoon climate based trees and they shed their leaves during summer session to preserve moisture into them.
(3) Write any three characteristic features of the trees found in the Mediterranean Forests.
Ans: The features are-
(i) trees need dry Summer and moderate rainfall during winter to grow up.
(ii) trees have spiny, leathery, waxy, small kinds of leaves.
(iii) Trees have long roots and Thick bark.
(4) Distinguish between a national park and a wildlife sanctuary.
Ans: National park- To protect wild life there is a well defined area where visitors can only visit and no one has the right to use forest products is known as national park.
Wildlife sanctuary- it is also a protected area to protect wild life. But here some limited human activities are permitted. For example from here people can collect timber, fire wood, medical herb for research and educational purposes.
(5) Suggest any three important measures for the protection of forests.
Ans: Measures to protect forests are-
(i) ‘Each one plant one ‘policy should be implemented.
(ii) Tree plantation program and afforestation program should be organised.
(iii) Shifting cultivation should be avoided.
(E) Answer the following questions-
(1) What is meant by natural vegetation? How do temperature and rainfall affect its distribution? Explain with examples.
Ans: Assembly of different kinds of naturally growing plant species in the environment is known as natural vegetation.
Heavy rainfall and moderate temperature are responsible for thick and dense forests. Decreasing size of trees, mosses, lichens are the results of low temperature and rainfall.
(2) Highlight any five points of distinction between Tropical Deciduous Forests and Coniferous Forests.
Ans: Tropical deciduous forest-
(i) trees have broad-leaves and medium size leaves.
(ii) Trees shed their leaves to conserve moisture.
(iii) Trees are medium in height.
(iv)These kind of forests are commonly found in India, Myanmar, East Brazil etc.
(v)Trees found in these forests are-Sal, teak, sandalwood etc.
Coniferous Forests-
(i) Shapes of the tress and the leaves are conical.
(ii) Trees don’t shed their leaves to conserve moisture.
(iii) Tall trees are found over here.
(iv) such forests are common in higher latitudes of the northern hemisphere and northern mountain regions of Europe, Asia etc.
(v) Pine, fur, Spruce, silver fir etc. are the example of tress in these kind of forests.
(3) ‘Forests are essential for maintaining an ecological balance.’ Justify the statement with suitable arguments.
Ans: “Forests are essential for maintaining an ecological balance” –
(i) Balancing the O2 and CO2 levels in the biosphere.
(ii) Providing livelihood to many people.
(iii) Its a natural habitat for wild animals.
(iv) Controlling flood by binding up soils with their roots.
(v) Causes rainfall and increases ground water level.
(4) Explain the importance of wildlife.
Ans: Important to dunce of wild life.-
(i) It maintains ecological balance.
(ii) It encourages tourism and give chances to many people to get their livelihood from that.
(iii) Humus produced from dead and decaying plants and animals increase the fertility of the soil.
(iv) Early alarming behaviors of animals could sense of natural calamities.
(5) How are human beings responsible for the depletion of vegetation and wildlife?
Ans: Human beings are responsible for the depletion of vegetation and wildlife -because they are continuously engaging themselves in Deforestation and hunting wild animals. Moreover their unjudgemental works such as using timber wood and animal skin and other things for business purposes, flourish industrial sectors and urban area can also encourage them to destroy forest lives.
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