1. It contains chromatin fibres, which are made up of DNA (Deoxyribonucleic acid). After cell division takes place, these chromatin fibres undergo certain structural changes, and are called chromosomes. These chromosomes carry the hereditary information of the genes.   Hint First letter clue   2. It provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   Hint       3. It is semi-permeable, allowing substances to enter and leave the nucleus of the cell. It also provides protection to the nucleus of the cell.   First letter clue   4. It performs intracellular digestion. It also helps in destroying foreign substances.   First letter clue   5. It is known as the 'site of protein synthesis in the cell', and synthesizes proteins. It is chiefly composed of RNA (Ribonucleic acid).   First letter clue   6. It controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   Hint       7. It helps in the storage of water and several other substances, namely food, waste products and pigments. It also provides turgidity to the cell.   Hint