1. 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 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 helps in the storage of water and several other substances, namely food, waste products and pigments. It also provides turgidity to the cell.   It provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   Hint Half-n-half Clue   2. Chloroplast   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 provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   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.   Hint       3. Lysosome   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 performs intracellular digestion. It also helps in destroying foreign substances.   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 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.   Half-n-half Clue   4. Cell Membrane   It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   It provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   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 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.   Hint       5. Leucoplast   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 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.   It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   Half-n-half Clue   6. Mitochondrion   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 is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   It controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   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.   Half-n-half Clue   7. Cell Wall   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 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 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.   Hint