Available Answers

1. 1.

   Tick (√) the correct options:

   1. Weathering of rocks is a _________________ process.
      1. very slow
      2. slow
      3. fast
      4. very fast
   2. Roots of trees reach upto _________________.
      1. bedrock
      2. substratum
      3. subsoil
      4. topsoil
2. 2.

   Tick (√) the correct options:

   1. Large and coarse particles are called ________________.
      1. clay
      2. silt
      3. humus
      4. sand
   2. Which of the following can be ploughed easily?
      1. sandy soil
      2. loamy soil
      3. mixed soil
      4. clayey soil
3. 3.

   Tick (√) the correct options:

   1. The smallest particles of soil are called _______________.
      1. clay
      2. sand
      3. silt
      4. gravel
   2. Substratum is also known as _______________.
      1. D-Horizon
      2. B-Horizon
      3. A-Horizon
      4. C-Horizon
   3. Which of the following layers is made up of small lumps of broken rocks and lacks humus?
      1. topsoil
      2. subsoil
      3. substratum
      4. bedrock
   4. Which of the following soils is a mixture of equal amount of sand and clay, with silt and humus?
      1. sandy soil
      2. clayey soil
      3. loamy soil
      4. mixed soil
   5. Which soil absorbs the most amount of water?
      1. sandy soil
      2. clayey soil
      3. loamy soil
      4. mixed soil
   6. Which type of soil is the best for growing crops?
      1. sandy soil
      2. clayey soil
      3. loamy soil
      4. sandy-loamy
   7. The percolation rate of water in a particular soil is expressed in _______________.
      1. mL/min
      2. L/min
      3. min/mL
      4. m/min
4. 4.

   Fill in the blanks:

   1. Topsoil provides ______________ to many organisms such as worms and rodents.
   2. Clayey soil has ______________ air.
   3. Water drains easily from ______________ soil, so it is required for growing lentils.
   4. ______________ soil is very sticky when wet.
   5. ______________ soil is not suitable for growing crops.
   6. Sandy soil lacks ______________.
5. 5.

   Which is the best soil for growing paddy?

6. 6.

   Which layer of soil profile is solid, non-porous and hard?