Question

group of students conducted an activity where they took three glasses A, B and C with same amount of soil and planted same sized seedlings. They added cow dung manure In glass A, little urea in glass B and nothing in C. Based on the observations after a week, answer the following: 1. In which glass, will you find seedling? 2. Seedlings of which glass shows maximum growth? 3. Give the inference of the activity. 4. Name the natural substance obtained from residues of plants. 5. Mention the role of soil.​

Answer 1

Soils provide anchorage for roots, hold water and nutrients. Soils are home to myriad micro-organisms that fix nitrogen and decompose organic matter, and armies of microscopic animals as well as earthworms and termites. We build on soil as well as with it and in it. Soil plays a vital role in the Earth's ecosystem.