1. It controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   Hint Hint       2. It synthesizes and secretes certain substances, namely hormones and enzymes. It also helps in the formation of acrosome of sperm.   Hint       3. It provides support to the cell. It also helps in the synthesis and transport of proteins and fats.   First letter clue   4. 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   5. It initiates and regulates cell division. It also helps in forming spindle fibres, with the help of asters.   First letter clue   6. It is a plastid. It helps in the storage of starch.   First letter clue   7. It is a plastid, containing a pigment called chlorophyll. This chlorophyll captures energy from sunlight and helps in the manufacture of food by the process of photosynthesis.   Hint