Case Study Questions Class 8 Science Conservation of Plants and Animals

Case Study Questions Class 8 Science Chapter 7 Conservation of Plants and Animals

CBSE Class 8 Case Study Questions Science Conservation of Plants and Animals. Important Case Study Questions for Class 8 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Conservation of Plants and Animals.

At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 4 marks.

CBSE Case Study Questions Class 8 Science Conservation of Plants and Animals

Case study 1

A great variety of plants and animalsexist on earth. They are essential for thewell-being and survival of mankind.Today, a major threat to survival of theseorganisms is deforestation. We knowthat deforestation means clearing offorests and using that land for otherpurposes. Trees in the forest are cut forsome of the purposes mentioned below:

  • Procuring land for cultivation.
  • Building houses and factories.
  • Making furniture or using wood as fuel.

Some natural causes of deforestationare forest fires and severe droughts.Deforestation increasesthe temperature and pollution level onthe earth. It increases the level of carbondioxide in the atmosphere. Ground waterlevel also gets lowered. They know thatdeforestation disturbs the balance innature. They were told by ProfessorAhmad that if cutting of trees continues,rainfall and the fertility of the soil willdecrease. Moreover, there will beincreased chances of natural calamitiessuch as floods and droughts.Recall that plants need carbondioxide for photosynthesis. Fewer treeswould mean that less carbon dioxide willbe used up resulting in its increasedamount in the atmosphere. This will leadto global warming as carbon dioxidetraps the heat rays reflected by the earth.The increase in temperature on the earthdisturbs the water cycle and may reducerainfall. This could cause droughts.Deforestation is a major cause whichleads to the change in soil properties.Physical properties of the soil get affectedby plantation and vegetation. Recall fromClass VII how trees prevent soil erosion.Fewer trees result in more soil erosion.Removal of the top layer of the soil exposesthe lower, hard and rocky layers. This soilhas less humus and is less fertile.Gradually the fertile land gets convertedinto deserts. It is called desertification.Deforestation also leads to a decreasein the water holding capacity of the soil.The movement of water from the soilsurface into the ground (infiltration rate)is reduced. So, there are floods. Theother properties of the soil like nutrientcontent, texture etc., also changebecause of deforestation.

Que. 1) Which among the following are some of the natural causes of deforestation?

(a)Reusing

(b) Recycling

(c) Plantation

(d) Forest fires

Que. 2) Due to the process of soil erosion fertile land gradually gets converted into deserts. This process is called

(a) Desertification

(b) Extinction

(c) Eradication

(d) Denitrification

Que. 3) Water holding capacity of soil……………………………………………………………………………………… due to deforestation.

(a) Increases

(b) Decreases

(c) Remains the same

(d) None of the above

Que. 4) What are the effects of deforestation on the environment?

Que. 5) Mention few reasons for cutting of trees in forest.

Answer Key

Que. 1) (d) Forest fires

Que. 2) (a) Desertification

Que. 3) (b) Decreases

Que. 4) Answer: Deforestation increases the temperature and carbon dioxide level in the atmosphere, it decreases the ground water level, rainfall and fertility of soil also decreases. It causes desertification and also decreases the water holding capacity of soil.

Que. 5) Answer: Cutting of trees is done to procure land for cultivation, to build houses and factories, to make furniture and to use as fuel.

Case study 2

Biosphere is that part of the earth inwhich living organisms exist or whichsupports life. Biological diversity orbiodiversity, refers to the variety oforganisms existing on the earth, theirinterrelationshipsandtheirrelationship with the environment.To protect our flora and fauna and theirhabitats, protected areas calledwildlife sanctuaries, national parksand biosphere reserves have beenearmarked. Plantation, cultivation,grazing, felling trees, hunting andpoaching are prohibited there.Wildlife Sanctuary: Areas whereanimals are protected from anydisturbance to them and their habitat.National Park: Areas reserved forwild life where they can freely use thehabitats and natural resources.Biosphere Reserve: Large areas ofprotected land for conservation of wildlife, plant and animal resources andtraditional life of the tribals living inthe area.Children along with Professor Ahmadand Madhavji enter the biospherereserve area. Madhavji explains thatbiosphere reserves are the areas meantfor conservation of biodiversity. As youare aware that biodiversity is the varietyof plants, animals and microorganismsgenerally found in an area. Thebiosphere reserves help to maintain thebiodiversity and culture of that area. Abiosphere reserve may also containother protected areas in it. ThePachmarhi Biosphere Reserve consistsof one national park named Satpura andtwo wildlife sanctuaries named Bori andPachmarhi.As the children walk around thebiosphere reserve, they appreciate thegreen wealth of the forest. They arevery happy to see tall teak trees andanimals inside the forest. Suddenly,Paheli finds a rabbit and wants tocatch it. She starts running after it.Professor Ahmad stops her. Heexplains that animals are comfortableand happy in their own habitat. Weshould not disturb them. Madhavjiexplains that some animals and plantstypically belong to a particular area.The plants and animals found in aparticular area are termed flora andfauna respectively of that area.

Que. 1) Biosphere reserve help to maintain the ………………………………………………………………………….. and culture of that area.

(a) Literacy

(b) Population

(c) Pollution

(d) Biodiversity

Que. 2) The terms used to describe the plants and animals found in a particular area are:

(a) Flip and flop

(b) Flora and fauna

(c) Fight and flight

(d) Flower and Fish

Que. 3) Which of the following national park is present in the Pachmarhi Biosphere Reserve?

(a) Satpura

(b) Jim Corbet

(c) Bandipur

(d) Kaziranga

Que. 4) Define Wildlife Sanctuary.

Que. 5) What is the definition of the term Biodiversity or Biological Diversity?

Answer Key

Que. 1) (d) Biodiversity

Que. 2) (b) Flora and fauna

Que. 3) (a) Satpura

Que. 4) Answer: Wildlife Sanctuaries are the areas where animals are protected from any disturbance to them and their habitat.

Que. 5)Answer: Biodiversity or Biological Diversity refers to the variety of organisms existing on earth, their interrelationships and their relationship with the environment.

Case study 3

Soon the group quietly enters the deep forest. Children are surprised to see a very big squirrel. This squirrel has a big fluffy tail. Madhavji tells them that this is known as the giant squirrel and is endemic to this area. Endemic species are those species of plants and animals which are found exclusively in a particular area. They are not naturally found anywhere else. A particular type of animal or plant maybe endemic to a zone, a state or a country. Madhavji shows sal and wild mango as two examples of the endemic flora of the Pachmarhi Biosphere Reserve. Bison, Indian giant squirrel and flying squirrel are endemic fauna of this area. Professor Ahmad explains that the destruction of their habitat, increasing population and introduction of new species may affect the natural habitat of endemic species and endanger their existence.Species is a group of population which are capable of interbreeding. This means that the members of a species can reproduce fertile offspring only with the members of their own species and not with members of other species. Members of a species have common characteristics. Professor Ahmad explains that killing (poaching) or capturing animals in general is strictly prohibited and punishable by law in all such places. Wildlife Sanctuaries like reserve forests provide protection and suitable living conditions to wild animals. He also tells them that people living in wildlife sanctuaries are allowed to do certain activities such as grazing by their livestock, collecting medicinal plants, firewood, etc.It is a pity that even protected forests are not safe because people living in the neighbourhood encroach upon them and destroy them. They recall that zoos are also places where animals receive protection.Some of the threatened wild animals like black buck, white eyed buck, elephant, golden cat, pink headed duck, gharial, marsh crocodile, python, rhinoceros, etc., are protected and preserved in our wild life sanctuaries. Indian sanctuaries have unique landscapes—broad level forests, mountain forests and bush lands in deltas of big rivers.On the roadside there was another board on which was written ‘Satpura National Park’. Children are now eager to go there. Madhavji tells them that these reserves are large and diverse enough to protect whole sets of ecosystems. They preserve flora, fauna, landscape and historic objects of an area. Satpura National Park is the first Reserve Forest of India.The finest Indian teak is found in thisforest. There are more than one hundredNational Parks in India.As children move ahead, they see aboard with ‘Satpura Tiger Reserve’written on it. Madhavji explains thatProject Tiger was launched by thegovernment to protect the tigers in thecountry. The objective of this projectwas to ensure the survival andmaintenance of the tiger population inthe country.Tiger is one of the manyspecies which are slowly disappearingfrom our forests. But, the Satpura TigerReserve is unique in the sense that asignificant increase in the population oftigers has been seen here. Once upon atime, animals like lions, elephants, wildbuffaloes and barasingha were also found in the SatpuraNational Park. Animals whose numbersare diminishing to a level that they mightface extinction are known as theendangered animals. Boojho isreminded of the dinosaurs which becameextinct a long time ago. Survival of someanimals has become difficult because ofdisturbances in their natural habitat.Professor Ahmad tells them that in orderto protect plants and animals’ strict rulesare imposed in all National Parks.Human activities such as grazing,poaching, hunting,capturing of animalsor collection of firewood, medicinal plants, etc. arenot allowed. Smallanimals are much more in danger ofbecoming extinct than the biggeranimals. At times, we kill snakes,frogs, lizards, bats and owls ruthlesslywithout realising their importance inthe ecosystem. By killing them we areharming ourselves. They might besmall in size but their role in theecosystem cannot be ignored. Theyform part of food chains and foodwebs.An ecosystem is made of all theplants, animals and microorganisms inan area along with non-livingcomponents such as climate, soil,river deltas etc.

Que. 1) Which among the following National Park is the first reserve forest of India?

(a) Omkareshwar National Park

(b) Satpura National Park

(c) Bison National Park

(d) Chandoli National Park

Que. 2) …………………………………………………………………………………… are the animals whose numbers are diminishing to a level that they might face extinction.

(a) Endangered animals

(b) Endemic species

(c) Pandemic species

(d) Excessive animals

Que. 3) Which of the following is a threatened wild animal that are protected and preserved in our wildlife sanctuaries?

(a) Black buck

(b) Grey wolf

(c) Panda

(d) Lion tailed macaque

Que. 4) Define the concept of species.

Que. 5) What do you understand by the term “endemic species”?

Answer Key

Que. 1) (b) Satpura National Park

Que. 2) (a) Endangered animals

Que. 3) (a) Black buck

Que. 4) Answer:Species is a group of populations which is capable of interbreeding. The members of the species can reproduce fertile offspring only with the members of their species.

Que. 5) Answer: Endemic species are those species of plants and animals which are found exclusively in a particular area. They are not naturally found anywhere else.

Case study 4

Professor Ahmad explains about Red Data Book to the children. He tells them that Red Data Book is the source book which keeps a record of all the endangered animals and plants. Red Data Book is maintained internationally by an organisation. India also maintains Red Data Book for plants and animals found in India.The excursion party then enters deeper into the forest under the guidance of Madhavji. They sit near the TawaReservoir to relax for some time. Paheli observes some of the birds near the river. Madhavji tells the children that these are migratory birds. These birds have flown here from other parts of the world. Migratory birds fly to far away areas every year during a particular time because of climatic changes. They fly for laying eggs as the weather in their natural habitat becomes very cold and inhospitable. Birds who cover long distances to reach another land are known as migratory birds.Professor Ahmad draws attention of the children to another cause of deforestation. He tells them that it takes 17 full grown trees to make one tonne of paper. Therefore, we should save paper. Professor Ahmad also tells that paper can be recycled five to seven times for use. If each student saves at least one sheet of paper in a day, we can save many trees in a year. We should save, reuse used paper and recycle it. By this we not only save trees but also save energy and water needed for manufacturing paper. Moreover, the amount of harmful chemicals used in paper making will also be reduced.Professor Ahmad suggests that the answer to deforestation is reforestation. Reforestation is restocking of the destroyed forests by planting new trees. The planted trees should generally be of the same species which were found in that forest. We should plant at least as many trees as we cut. Reforestation can take place naturally also. If the deforested area is left undisturbed, it re- establishes itself. In natural reforestation there is no role of human beings. We have already caused tremendous damage to our forests. If we have to retain our green wealth for future generations, plantation of more trees is the only option. Professor Ahmad told them that in India we have the Forest (Conservation) Act. This act is aimed at preservation and conservation of natural forests and meeting the basic needs of the people living in or near the forests. After some rest Madhavji asks the children to start heading back because it is not advisable to stay in the jungle after sunset. On getting back, Professor Ahmad and the children thank Madhavji for guiding them through this exciting experience.

Que. 1) Birds who cover long distances to reach another land are known as …………………………………………………………………………………………. birds.

(a) Flying

(b) Endemic

(c) Statutory

(d) Migratory

Que. 2) In India which act is aimed at preservation and conservation of natural forests and meeting the basic needs of the people living in or near the forests.

(a) RTE Act

(b) Forest Act

(c) Environment Act

(d) Air Act

Que. 3) Which of the following is the best measure to save paper?

(a) Recycling paper

(b) Excessive use

(c) Wasting paper

(d) Tearing paper

Que. 4) define “Reforestation”.

Que. 5) What is a “red data book”?

Answer Key

Que. 1) (d) Migratory

Que. 2) (b) Forest Act

Que. 3) (a) Recycling paper

Que. 4) Answer: Restocking of destroyed forest by planting new trees which are generally of the same species that were found in the forest is called reforestation.

Que. 5) Answer: Red data book is a source book which keeps a record of all the endangered animals and plants. Red data book is maintained internationally by an organisation.

Updated: March 11, 2022 — 3:57 pm

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