1. It is a plastid. It helps in the storage of starch.   Leucoplast   Ribosome   Nucleus   Golgi Apparatus   Hint Half-n-half Clue   2. 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.   Cytoplasm   Vacuole   Nucleolus   Chloroplast   Half-n-half Clue   3. It helps in the storage of water and several other substances, namely food, waste products and pigments. It also provides turgidity to the cell.   Nucleoplasm   Lysosome   Vacuole   Nucleus   Hint       4. It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   Cell Membrane   Mitochondrion   Cell Wall   Nucleus   Half-n-half Clue   5. It synthesizes and secretes certain substances, namely hormones and enzymes. It also helps in the formation of acrosome of sperm.   Vacuole   Golgi Apparatus   Cell Membrane   Ribosome   Hint       6. It is known as the 'site of protein synthesis in the cell', and synthesizes proteins. It is chiefly composed of RNA (Ribonucleic acid).   Nuclear Membrane   Centrosome   Ribosome   Endoplasmic Reticulum   Half-n-half Clue   7. It controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   Nucleus   Cell Wall   Nucleolus   Vacuole   Hint