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1. what is cell wall ? give its role in the cell body ?2. what is migration ? why do the birds migrate from one country to another ? 3. define the term irrigation ? list different method of irrigation? 4. explain different steps of WWTP ( waste water treatment) |
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Answer» Answer: 1.cell wall is the outer layer of plant cell made up of cellulose. It help in preventing of foreign material into the cell. 2.Movement of ANIMALS from ONE place to another for breeding or for survival. They migrate from one place to another DUE to CLIMATIC changes and for breding |
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