1. Nucleus   It controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   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.   It provides support to the cell. It also helps in the synthesis and transport of proteins and fats.   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.   Hint Hint       2. Nuclear Membrane   It initiates and regulates cell division. It also helps in forming spindle fibres, with the help of asters.   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.   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.   It controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   Half-n-half Clue   3. Cell Membrane   It provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   It helps in the storage of water and several other substances, namely food, waste products and pigments. It also provides turgidity to the cell.   It initiates and regulates cell division. It also helps in forming spindle fibres, with the help of asters.   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       4. Mitochondrion   It is known as the 'site of protein synthesis in the cell', and synthesizes proteins. It is chiefly composed of RNA (Ribonucleic acid).   It synthesizes proteins by producing and storing RNA (Ribonucleic acid). At the same time, it orders ribosomes to synthesize proteins.   It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   It is a plastid. It helps in the storage of starch.   Half-n-half Clue   5. Ribosome   It is known as the 'site of protein synthesis in the cell', and synthesizes proteins. It is chiefly composed of RNA (Ribonucleic acid).   It provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   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.   It is a plastid. It helps in the storage of starch.   Half-n-half Clue   6. Nucleolus   It helps in the storage of water and several other substances, namely food, waste products and pigments. It also provides turgidity to the cell.   It synthesizes and secretes certain substances, namely hormones and enzymes. It also helps in the formation of acrosome of sperm.   It synthesizes proteins by producing and storing RNA (Ribonucleic acid). At the same time, it orders ribosomes to synthesize proteins.   It provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   Half-n-half Clue   7. Golgi Apparatus   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.   It synthesizes and secretes certain substances, namely hormones and enzymes. It also helps in the formation of acrosome of sperm.   It is a plastid, containing pigments such as xanthophyll (yellow in color) and carotene (orangish-red in color). These pigments impart color to flowers and fruits of plants.   It is a plastid. It helps in the storage of starch.   Hint