Available Answers

1. 1.

   While observating a sample of soil, Ankit found some pieces of polythene bags and plastic articles. Where do these come from?

2. 2.

   You must have seen matkas, surahi etc. What kind of soil is used to make such articles?

3. 3.

   What is the difference between rate of percolation and the amount of water retained?

4. 4.

   Check point:

   1. The soil contains rock particles. minerals and ______________.
      1. Air
      2. Water
      3. None
      4. Both (a)and (b)
   2. Humus and the mineral particles of rock form the ______________.
      1. A-Horizon
      2. B-Horizon
      3. C-Horizon
      4. Bedrock
   3. Paddy grows best in ______________.
      1. Clayey soil
      2. Sandy soil
      3. Loam
      4. Sandy loam
   4. The water holding capacity is highest in ______________.
      1. Sandy soil
      2. Loamy soil
      3. Clayey soil
      4. Sandy-loamy
   5. Layer of soil with cracks and crevices ______________.
      1. Subsoil
      2. Bedrock
      3. C-Horizon
      4. Topsoil
   6. This soil is best for growing cotton ______________.
      1. Sandy
      2. Loamy
      3. Clayey
      4. Sandy-loam
5. 5.

   True-False:

   1. Presence of humus in topsoil makes it dark in colour.
   2. Loamy soil has the right water holding capacity for the growth of plants.
   3. Removal of topsoil is called deforestation.
   4. C-horizon is best for growing plants.
   5. Humus makes the soil fertile.
6. 6.

   Fill in the blanks:

   1. B-horizon is lighter in colour because of the presence of less amount of _______________.
   2. _______________ soil is not well aerated.
   3. _______________ is very fertile.
   4. The cutting down of trees on a large scale is called _______________.
   5. _______________ soil allows less water to percolate.
   6. Loam is a mixture of sand, clay, _______________ and _______________.