Q1 state the important properties of soil.
Q2 state two advantages of vegetative propagation in plants.
Answers
soil are essential for life in the sense that they provide the medium for plant growth habitat for many insects and other organisms act as a filtration system for surface water carbon store and maintenance of atmospheric gases. soils provide plants with essential minerals and nutrients.
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1. Over long periods of time, thousands and millions of years, the rocks at or near the surface of the earth are broken down by various physical, chemical and some biological processes. The end product of this breaking down is the fine particles of soil .
Since all parts of the rock do not expand and contract at the same rate, this results in the formation of cracks and ultimately the huge rocks break up into smaller pieces.
Fast flowing water often carries big and small particles of rock downstream. These rocks rub against other rocks and the resultant abrasion causes the rocks to wear down into smaller and smaller particles. The water then takes this particles along with it and deposits it further down its path.
In a process similar to the way in which water rubs against rocks and wears them down, strong winds also erode rocks down. The wind also carries sand from one place to the other like water does.
While growing, they release certain substances that cause the rock surface to powder down and form a thin layer of soil.