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Q3, , Q4, , Notes on Science for Class VII, , Chapter-9, , SOIL, What is soil ?, See text book page No 99., Write the importance of soil., The importance of soil are :, i) It provides encourage to the plants and supplies water and nutrients., ii) It is the home for many organisms., iii) It is essential for agriculture. Agriculture provides food, clothing and shelter for all., What is soil profile ? Support your answer with a diagram., Vertical section through different layer of the soil is called the soil profile. Each layer, , differs in feel (texture) colour, depth and chemical composition. These layers are referred, to as horizons., , Diagram - figure 9.9, , Define weathering., , See text book page 97., , What is Humus ?, , See text book page 97., , What are the different types of soil ?, , See text book page 99., , Give the reason why loamy soil is the best top soil for growing plants., , Loamy soil is the best top soil for growing plants because it is a mixture of sand, clay, , and silt. The loamy soil also has humus in it. It has the right water holding capacity for, the growth of plants.