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.   Nucleoplasm   Mitochondrion   Ribosome   Cytoplasm   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).   Golgi Apparatus   Leucoplast   Lysosome   Ribosome   Half-n-half Clue   3. It synthesizes and secretes certain substances, namely hormones and enzymes. It also helps in the formation of acrosome of sperm.   Centrosome   Chromoplast   Nucleus   Golgi Apparatus   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.   Nucleolus   Chloroplast   Leucoplast   Vacuole   Hint       5. 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.   Nuclear Membrane   Golgi Apparatus   Cytoplasm   Nucleus   Half-n-half Clue   6. 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.   Nuclear Membrane   Nucleoplasm   Cell Wall   Endoplasmic Reticulum   Hint       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.   Nuclear Membrane   Golgi Apparatus   Chromoplast   Mitochondrion   Half-n-half Clue