Question

how does deforestation occur?                                                                                                 class 12th CBSE biology sample paper

Answer 1

Deforestation is caused due to various reasons listed below:

1)Industrial setup

2)overgrasing by herbivorous

3)mountain and forest roads

4)requirements of wood

4)quarryind and mines

5)forest fires

6)hydroelectric projects and jhuming etc.

Answer 2

Deforestation and it's causes...

Felling of trees to fulfill our need of fuel and timber is called Deforestation. Due to population explosion we are constantly in need of more and more fuel wood, timber as construction material.

The causes for deforestation can be listed as under :

1. Population Explosion :
With increase in population accompanied by economic and technological development, more and more land is required for roads, railways, housing, industries, schools and colleges. Forest is the only area from where land can be retrieved and deforestation occurs.

2. Wood for Industries and Paper :
Wood is used for making boxes, crates, packing cases, furniture, doors, windows, plywood, paper, matchboxes, artwork, ships, boats, etc. With ever increasing consumption of these materials wood is always in short supply and forest are at the receiving end.

3. Dam and Hydroelectric Projects :
A large forest area has to be cleared to construct dams for storing water. A large forest cover is lost in this way.

4. Fires :
Occurrence of fire in forest is a common phenomenon. Once the fire starts it does not stop till it has caused a huge loss. Fire destroys trees, seedlings and humans.

5. Overgrazing :
Overgrazing of forests by livestocks badly degrades forests leading to deforestation.

6. Smuggling of Woods :
An illegal log market lead to unscrupulously felling of trees for their personal gains without consideration for national loss that it causes.