23 September 2014

Deforestation and Reforestation: Science

Deforestation and Reforestation: Science Cbse / Ncert Revision Notes

Plants are needed for the survival of other living organisms. Forests cover extensive area on earth. But forests are being cleared to avail more land for growing population, industries etc.

Deforestation: It is the process of cutting down the trees.

It is also the clearing of forests to use the land for cultivation, building houses, factories,  construction of dams, or to obtain wood for making furniture and using it as fuel.

Causes for Deforestation

There are two causes -  Man-made causes and Natural causes.
  • Cases where human beings are responsible for deforestation are known as man-made causes. 
  • Cases which involve nature such as forest fires, severe floods and severe droughts are known as natural causes.
Deforestation and Reforestation, Causes and effects of Deforestation, Class 8 Science Cbse / Ncert Revision Notes

Effects of deforestation 

For the survival and well-being of the human species, a vast variety of plants and animals exist on the earth. Adverse effects of deforestation are elucidated.
  • Global warming - The increase in the temperature levels is called global warming.  Carbon dioxide released into the atmosphere traps sunlight reflected by the earth’s surface and results in an increase in temperature levels on the earth.
  • Uneven distribution of rainfall
  • Floods and droughts


It is planting new trees in destroyed forest area. It is advisable to replant trees of the same species that are found in a forest.

Forest Conservation Act: In India, this act is aimed at preserving and conserving natural forests.

Recycling of paper:  Recycling process of paper is of great significance in saving trees.  Used paper is sent back to the factories for recycling to produce new papers. Recycling of paper saves many trees as 17 trees are used to produce one tonne of paper. Hence, recycling of paper is essential to avoid deforestation.