Available Answers

1. 1.

   Choose and write the correct answer(MCQs):

   1. Which of the following soil particles are the smaller in size?
      1. gravel
      2. clay
      3. sand
      4. none of these
   2. Which of the following soils holds the maximum amount of water?
      1. sandy soil
      2. clayey soil
      3. loamy soil
      4. none of these
   3. The best soil for healthy growth of plants is:
      1. sand
      2. clay
      3. only water
      4. loam
   4. Bed rock is present below:
      1. a-horizon
      2. b-horizon
      3. c-horizon
      4. none of these
   5. Mountain soil is fertile because:
      1. it contains a lot humus
      2. it contains a lot of minerals
      3. it is rich in alluvium
      4. none of these
   6. The top most layer of soil is:
      1. topsoil
      2. subsoil
      3. water
      4. sand
2. 2.

   Fill in the blanks:

   1. Decayed organic matter in the soil forms _______________.
   2. _______________ are the largest soil particles.
   3. Soil is formed by _______________ of rocks.
   4. _______________ in soil is a farmer's friend.
   5. _______________ is responsible for increasing the acidity of soil.
   6. Overuse of _______________ by farmers changes the textual of the soil.
   7. No humus is present in _______________ horizon.
   8. _______________ is the process of protecting soil from erosion.
   9. The deposit of clay, sand and silt particles left by a river is called ______________.
   10. _______________ particles are neither as large as sand particles, nor as clay particles.
3. 3.

   Write T for true or F for false:

   1. Soil is formed by weathering.
   2. There are six types of soil in India.
   3. Chemical pesticides are biodegradable.
   4. Embarkment is used to protect soil.
   5. Roots of he plants bind the soil.
   6. The fertility of soil can be increased by crop rotation.
4. 4.

   Match the column A with column B:

   A	B
   1. Mountain soil	a. Rajasthan
   2. Black soil	b. Madhya Pradesh
   3. Red soil	c. Himalayan region
   4. Deserts soil	d. Maharashtra
   5. Earthworm	e. Farmer's friend
   6. B-Horizon	f. Gravel
   7. A-Horizon	g. Subsoil
   8. C-Horizon	h. Topsoil

5. 5.

   What are soil horizons? Write briefly about the A, B and C horizons?
6. 6.

   How can soil pollution be prevented?