1.
Climate
2.
In the biosphere living beings are inter-related and interdependent on each other for survival. This life supporting system is known as the ecosystem.
3.
Option A
4.
Deforestation, soil erosion, constructional activities, forest fires, tsunami and landslides are some of the human-made and natural factors which together accelerate the process of extinction of these great natural resources.
5.
Rocks are piled up to slow down the flow of water. This prevents gullies and further soil loss.
6.
Option A
7.
Option A
8.
Plants provide us with timber, give shelter to animals, produce the oxygen we breathe, protects soils so essential for growing crops, act as shelter belt, fruits, nuts, latex, turpentine oil, gum, medicinal plants and also the paper that is so essential for your studies.
9.
In the coastal and dry regions, rows of trees are planted to check the wind movement to protect soil cover.
10.
A prolonged spell of rainfall can cause a heavy landslide that can block the flow of the river for quite some time. The formation of river blocks can cause havoc to the settlements downstream on its bursting.
11.
Awareness programmes like social forestry and Vanamohatasava should be encouraged at the regional and community level. School children should be encouraged for bird watching and be visiting nature camps so that they appreciate the habitat of varied species.
12.
Option A
13.
Option A
14.
Landslides
15.
Option A
16.
soil.
17.
Pangi
18.
Option A
19.
Option A
20.
Cultural
