1. It initiates and regulates cell division. It also helps in forming spindle fibres, with the help of asters.   Hint First letter clue   2. It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   First letter clue   3. It controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   Hint       4. 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   5. It synthesizes proteins by producing and storing RNA (Ribonucleic acid). At the same time, it orders ribosomes to synthesize proteins.   First letter clue   6. 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   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