1. It contains chromatin fibres, which are made up of DNA (Deoxyribonucleic acid). After cell division takes place, these chromatin fibres undergo certain structural changes, and are called chromosomes. These chromosomes carry the hereditary information of the genes.   Cell Membrane   Cell Wall   Nucleoplasm   Nuclear Membrane   Hint Half-n-half Clue   2. It is known as the 'site of protein synthesis in the cell', and synthesizes proteins. It is chiefly composed of RNA (Ribonucleic acid).   Ribosome   Nucleus   Vacuole   Nuclear Membrane   Half-n-half Clue   3. 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.   Lysosome   Cytoplasm   Cell Wall   Cell Membrane   Hint       4. It helps in the storage of water and several other substances, namely food, waste products and pigments. It also provides turgidity to the cell.   Vacuole   Endoplasmic Reticulum   Nucleolus   Cytoplasm   Hint       5. It synthesizes and secretes certain substances, namely hormones and enzymes. It also helps in the formation of acrosome of sperm.   Mitochondrion   Leucoplast   Nuclear Membrane   Golgi Apparatus   Hint       6. It controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   Nucleus   Chloroplast   Golgi Apparatus   Vacuole   Hint       7. It provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   Centrosome   Nuclear Membrane   Cell Membrane   Nucleoplasm   Hint