Question

Look at the figure alongside and answer the following questions

............. is a major factor in deciding the soil structure because it causes the soil to become more porous and allows water and air to penetrate deep underground.

• A. Humans
• B. Particle size
• C. Minerals
• D. Micro Organisms

Answer 1

Answer: (A)

The soil is a mixture. It contains small particles of rock (of different sizes). It also contains bits of decayed living organisms which is called humus. In addition, soil also contains various forms of microscopic life. The type of soil is decided by the average size of particles found in it and the quality of the soil is decided by the amount of humus and the microscopic organisms found in it. Humus is a major factor in deciding the soil structure because it causes the soil to become more porous and allows water and air to penetrate deep underground. The mineral nutrients that are found in a particular soil depend on the rocks it was formed from. The nutrient content of a soil, the amount of humus present in it and the depth of the soil are some of the factors that decide which plants will thrive on that soil.

So, the correct answer is 'Humans'.