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 is a plastid. It helps in the storage of starch.   First letter clue   3. It is the house of all metabolic activities and functions in the cell. In other words, it contains most of the cell organelles, each of which perform a specific function.   First letter clue   4. It performs intracellular digestion. It also helps in destroying foreign substances.   First letter clue   5. It provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   Hint       6. It provides protection, shape and rigidity to the cell. It is freely permeable, allowing substances in the form of solutions to enter and leave the cell without any hindrance.   Hint       7. 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