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1
define weathering?
breaking down of rocks by action of wind ,water ,climate
breaking down of rocks by action of wind ,water ,star
breaking down of rocks by action of wind ,water ,xerophytes
breaking down of rocks by action of wind ,water ,animals
2
Various layers of soil are called ________________
Soil profile
Soil erosion
Horizon
Layers
3
Soil is _____________ for the existence of life on Earth.
Not Necessary
Essential
Not Required
Can not be said
4
Select the one that provides shelter for living organisms like worms, rodents, etc.
A - horizon
B - horizon
C - horizon
Bedrock
5
Of the four distinct layers or sections of soil profile, organic matter is found in _______________
Top soil
Second layer from the top
Third layer from the top
The bottom layer
6
Largest size particles of soil are ___________________
Sand
Gravel
Silt
Clay
7
Percolation means to ___________________ or ___________________ through very small holes.
Water, sand
Pass, filter
Water and oil
Oil, sand
8
One of the following factors does not lead to soil formation in nature:
Sun
Water
Wind
Plastic
9
Which of the following factors affect the nature of soil ?
Rocks
Vegetation
Soil
10
The limiting factor in nitrification of soil is ____________________
Soil nature (pH)
Light
Temperature
Air
11
Soil was dug from the garden and dissolved in water (about 500 ml) taken in a beaker. The beaker was shaken vigorously for about a minute and then kept undisturbed. After sometime the soil settles down and different components present in the soil (i.e., sand, clay, humus, graval and soil) formed different layers as known in figure. Layer represented by (A) is :
12
Good soil is____
Which allows to the limited amount of water into it
Which allows to percolate the water slowly from it
Which allows to pass water quicly from it
Which holds whole of water into it
13
Soils are classified according to their :
colour and type of mineral content
colour and texture
texture and type of mineral content
colour, texture and type of mineral content
14
Loamy soil contains which of the following
All of these
15
Statement (i) is correct while statement (ii) is incirrect.
Statement (ii) is correct while statement (i) is incirrect.
Both statements are correct
Both statements are incorrects.