1. It is known as the 'site of protein synthesis in the cell', and synthesizes proteins. It is chiefly composed of RNA (Ribonucleic acid).   Cytoplasm   Ribosome   Lysosome   Nucleolus   Hint Half-n-half Clue   2. It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   Nucleus   Cell Membrane   Ribosome   Mitochondrion   Half-n-half Clue   3. It controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   Lysosome   Nucleus   Chromoplast   Endoplasmic Reticulum   Hint       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.   Chromoplast   Cell Membrane   Nucleolus   Nuclear Membrane   Half-n-half Clue   5. 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.   Chromoplast   Leucoplast   Cell Wall   Ribosome   Hint       6. It synthesizes proteins by producing and storing RNA (Ribonucleic acid). At the same time, it orders ribosomes to synthesize proteins.   Centrosome   Golgi Apparatus   Nucleus   Nucleolus   Half-n-half Clue   7. 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.   Nucleolus   Chromoplast   Nucleoplasm   Ribosome   Half-n-half Clue