1. It has a non-living, rigid structure. It is freely permeable and is chiefly composed of cellulose.   Hint Hint       2. It is a clear space filled with water or other substances in the form of solutions. It has a covering called tonoplast.   Hint       3. It consists of an irregular network of double-walled tubular membrane. It has ribosomes attached to it.   First letter clue   4. It has a living, flexible and thin structure. It possesses fine pores, making it semi-permeable. It is chiefly composed of lipo-proteins.   Hint       5. It has numerous pores, making it semi-permeable. It is the covering of the nucleus of the cell.   First letter clue   6. It contains one or two centrioles, and is surrounded by microtubules or the centrosphere. It is situated near the nucleus.   First letter clue   7. It has a vesicular structure. It is formed when the substances produced in the endoplasmic reticulum are further processed in the golgi apparatus.   First letter clue