NCERT Class 8 Science Chapter 7: Conservation of Plants and Animals YouTube Lecture Handouts

Download PDF of This Page (Size: 516K)

Get video tutorial on: https://www.YouTube.com/c/Examrace

Watch Video Lecture on YouTube: NCERT Class 8 Science Chapter 7: Conservation of Plants and Animals (NSO/NSTSE) | English

NCERT Class 8 Science Chapter 7: Conservation of Plants and Animals (NSO/NSTSE) | English

Loading Video
Watch this video on YouTube

What You Will Learn?

  • Zoo versus Wildlife Sanctuary and National Park

  • Biosphere Reserve

  • Migratory Birds

  • IUCN Classification

  • Endangered Species

Image of the tree

Image of the Tree

Image of the tree

Image of Cut the tree

Image of Cut the Tree

Image of Cut the tree

Image of Farmer

Image of Farmer

Image of Farmer

Deforestation and Its Causes

  • Procuring land for cultivation

  • Building houses and factories

  • Making furniture or using wood as fuel.

Image of Deforestation and Its Causes

Image of Deforestation and Its Causes

Image of Deforestation and Its Causes

  • A great variety of plants and animals exist on earth. They are essential for the well-being and survival of mankind. Today, a major threat to survival of these organisms is deforestation. We know that deforestation means clearing of forests and using that land for other purposes.

  • Deforestation also leads to a decrease in the water holding capacity of the soil. The movement of water from the soil surface into the ground (infiltration rate) is reduced. So, there are floods. The other properties of the soil like nutrient content, texture etc., also change because of deforestation.

Consequences of Deforestation

  • How does deforestation reduce rainfall on the one hand and lead to floods on the other?

    Image of Consequences of Deforestation

    Image of Consequences of Deforestation

    Image of Consequences of Deforestation

  • Deforestation increases the temperature and pollution level on the earth. It increases the level of carbon dioxide in the atmosphere. Ground water level also gets lowered. They know that deforestation disturbs the balance in nature.

  • Moreover, there will be increased chances of natural calamities such as floods and droughts. Recall that plants need carbon dioxide for photosynthesis. Fewer trees would mean that less carbon dioxide will be used up resulting in its increased amount in the atmosphere. This will lead to global warming as carbon dioxide traps the heat rays reflected by the earth. The increase in temperature on the earth disturbs the water cycle and may reduce rainfall. This could cause droughts.

  • Fewer trees result in more soil erosion.

  • Removal of the top layer of the soil exposes the lower, hard and rocky layers. This soil has less humus and is less fertile. Gradually the fertile land gets converted into deserts. It is called desertification.

  • Deforestation also leads to a decrease in the water holding capacity of the soil. The movement of water from the soil surface into the ground (infiltration rate) is reduced. So, there are floods.

Biosphere, Biodiversity

  • Biosphere reserves help to maintain biodiversity and culture of that area.

  • Pachmarhi Biosphere Reserve consists of one national park named Satpura and two wildlife sanctuaries named Bori and Pachmarhi

  • Biosphere is that part of the earth in which living organisms exist or which supports life. Biological diversity or biodiversity, refers to the variety of organisms existing on the earth, their interrelationships and their relationship with the environment.

  • Wildlife Sanctuary : Areas where animals are protected from any disturbance to them and their habitat.

  • National Park : Areas reserved for wild life where they can freely use the habitats and natural resources.

  • Biosphere Reserve : Large areas of protected land for conservation of wild life, plant and animal resources and traditional life of the tribals living in the area

  • The government lays down rules, methods and policies to protect and conserve them

Flora and Fauna

Image of Flora and Fauna

Image of Flora and Fauna

Image of Flora and Fauna

  • The plants and animals found in a particular area are termed flora and fauna respectively of that area.

  • Pachmarhi – sal and wild mango are endemic to this region along with bison and flying squirrel

Endemic Species

Image of Endemic Species

Image of Endemic Species

Image of Endemic Species

  • 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 may be endemic to a zone, a state or a country.

  • 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.

What is the Difference between a Zoo and a Wildlife Sanctuary?

Image of zoo and a wildlife sanctuary

Image of Zoo and a Wildlife Sanctuary

Image of zoo and a wildlife sanctuary

  • Wildlife Sanctuaries like reserve forests provide protection and suitable living conditions to wild animals

  • Even protected forests are not safe because people living in the neighbourhood encroach upon them and destroy them.

  • Zoos are also places where animals receive protection

National Park

Image of National Park

Image of National Park

Image of National Park

  • Satpura National Park is the first Reserve Forest of India. The finest Indian teak is found in this forest.

  • Project Tiger was launched by the government to protect the tigers in the country. The objective of this project was to ensure the survival and maintenance of the tiger population in the country

  • Human activities such as grazing, poaching, hunting, capturing of animals or collection of firewood, mdicinal plants, etc. are not allowed

  • Animals whose numbers are diminishing to a level that they might face extinction are known as the endangered animals

  • An ecosystem is made of all the plants, animals and microorganisms in an area along with non-living components such as climate, soil, river deltas etc.

Red Data Book

  • 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 organization. India also maintains Red Data Book for plants and animals found in India.

  • Migratory Birds - Migratory birds fly to far away areas every year during a particular time because of climatic changes and unavailability of food

Recycling of Paper

Image of Recycling of Paper

Image of Recycling of Paper

Image of Recycling of Paper

  • It takes 17 full grown trees to make one ton of paper. Therefore, we should save paper. 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.

Reforestation

  • 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

  • We should save, reuse and recycle paper to save trees, energy and water.

  • Reforestation is the restocking of destroyed forests by planting new trees.

Developed by: