Soil

Which one of the following is a step in formation of soil?
1. Earthquake or volcanic eruptions
2. weathering of rock
3. addition of humus
4. all are involved in formation of soil
In which horizon of soil minerals are found?
1. A
2. B
3. C
4. none of these
Which physical property of soil is important to us?
1. texture
2. water holding capacity
3. both of these
4. none of these
Which of the following type of soil will form a collidal solution when suspended in water?
1. clay
2. silt
3. sand
4. gravel
Which factor influences soil formation?
1. climate
2. vegetation
3. parent rock
4. all of these
The proportion os sand,silt and clay in soil sample determines
1. structure
2. texture
3. nutrient potential
4. fertility level
The microorganisms present in the soil require moisture and nutrients for growth and survival.Choose from the options below the habitat where the soil has plenty of water and nutrients.
1. dessert
2. forest
3. open field
4. cricket ground
Availability of water and minerals in the soil for maximum absorption by roots is in the:
1. B-horizon
2. C-horizon
3. A-horizon
4. surface of soil
Soil conservation measures are mainly aimed at protecting which of the following?
1. plants
2. sub soil
3. soil organisms
4. humus
Read the following statements with refrence to soil:
i)weathering is a very fats process of soil formation.
ii) percolation of water is faster in sandy soil
iii)loamy soil contains only sand and clay.
iv) top soil contains the maximum amount of humus.
choose the correct statement frome the above
1. ii & iv
2. i & iii
3. ii & iii
4. i & ii