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Forests - Our Lifeline Summary Class 7 NCERT Summary Chapter 12

Forest

  • It is a large area of land thickly covered with trees, bushes etc.
  • It is a system comprising various plants, animals and micro-organisms.
  • It is also protect the soil from erosion.
  • It influences climate, water cycle and air quality.
  • The uppermost layer of forest is trees followed by shrubs, the herbs to the lowest layer of vegetation.
  • Different layers of vegetation provide shelter and food for birds, animals and insects.
  • The components of forest are interdependent on one another.
  • Forest keeps on growing and changing. Also forest can regenerate.

Deforestation

  • It is a process of cutting down of trees is known as deforestation.

Effect of deforestation

  • Due to deforestation the amount of carbon dioxide in air will increase, which increase the temperature of earth.
  • Deforestation cause floods because soil lost the capacity to hold water.
  • Insects, animals, birds will not get food and shelter.
  • It cause endanger lives and environment.

Independence of plants and animals in forest

  • Animals and plants depend on each other to remain alive.
  • Organisms interact with each other and their physical environment to derive energy and survive.

Canopy

  • It is the aboveground portion of a plant community or crop, formed by plant crowns.
  • In terms of forest canopy refers to the upper layer formed by mature tree crowns and including other biological organisms.

Food chain

  • It is an interdependence of organisms which shows that who eats whom is known as food chain.
  • Interdependence of producer to consumer and form of various linkages that appears as a chain is known as food chain.

Food web

  • It is a system of interdependent food chain used to represent various relationships in organisms is called food web.

Importance of forests

  • It purify air
  • It prevent soil erosion
  • Forest is noise absorbers
  • It provide timber
  • It provide shelter to the animals
  • It helps in to control floods

Conservation of forests

  • Control forest fires
  • Promote afforestation
  • Do not allow overgrazing
  • Protect wildlife
  • Social forestry
  • Establishment of national parks and bio-reserves.
The document Forests - Our Lifeline Summary Class 7 NCERT Summary Chapter 12 is a part of the Class 7 Course Science Class 7.
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