MODIFICATIONS OF THE ENVIRONMENT-B

The reservoir of water present under the ground

• water source

• gravitational water

• aquifer

• marine water

The downward movement of gravitational water through the soil is called____________________

• percolation

• gravity

• retention

• potable water

The physical properties of soil include

• colour

• porosity

• both a and b

• acidity

This layer consists of surface litter like leaves, twigs, animal wastes etc

• O - horizon

• sub soil

• top soil

• C-horizon

The main reason why the soil becomes contaminated is due to the presence of

• man made waste

• animal excreta

• dry leaves

• both b and c

Organic farming methods should be encouraged to reduce soil pollution.

• true

• false

• cant say

The pollutants absorbed by the forest soil are broken down by soil ______________ into simpler forms.

• bacteria

• virus

• fungi

• algae

The removal of top soil by wind, water or rain is called

• soil erosion

• deforestation

• crop rotation

The forests are essential to maintain water and soil resources.

• True

• False

The forests serve as natural barriers to storms and floods and they have considerable water retention capacity that reduces runoff and landslides during heavy rains.

• True

• False