1. It synthesizes and secretes certain substances, namely hormones and enzymes. It also helps in the formation of acrosome of sperm.   Hint Hint       2. It initiates and regulates cell division. It also helps in forming spindle fibres, with the help of asters.   First letter clue   3. It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   First letter clue   4. It is a plastid. It helps in the storage of starch.   First letter clue   5. It performs intracellular digestion. It also helps in destroying foreign substances.   First letter clue   6. It synthesizes proteins by producing and storing RNA (Ribonucleic acid). At the same time, it orders ribosomes to synthesize proteins.   First letter clue   7. 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