show that dry soil also contains some amount of water
Answers
Answer: When dry soil is crushed in the hand, it can be seen that it is composed of all kinds of particles of different sizes.
Most of these particles originate from the degradation of rocks; they are called mineral particles. Some originate from residues of plants or animals (rotting leaves, pieces of bone, etc.), these are called organic particles (or organic matter). The soil particles seem to touch each other, but in reality have spaces in between. These spaces are called pores. When the soil is "dry", the pores are mainly filled with air. After irrigation or rainfall, the pores are mainly filled with water. Living material is found in the soil. It can be live roots as well as beetles, worms, larvae etc. They help to aerate the soil and thus create favourable growing conditions for the plant roots
Explanation:
Answer:
The soil in natural state contains lots of moisture that helps in the growth of the plants. This theory can be easily proved by taking some soil in a test tube and heat it to a high temperature.
Gradually, the water vapor arises up the test tube and reaches to colder topmost part of the test tube, where the these vapors may condense due to the touch of the colder surface, if the test tube is closed, thus proving the existence of water in the soil.
If the test tube is open, the water vapors escape out in the atmosphere and if the soil is weighed before and after the heating, the difference in weight proves that soil contains water.