1. It is a plastid. It helps in the storage of starch.   Golgi Apparatus   Chloroplast   Leucoplast   Endoplasmic Reticulum   Hint Half-n-half Clue   2. It helps in the storage of water and several other substances, namely food, waste products and pigments. It also provides turgidity to the cell.   Ribosome   Chloroplast   Vacuole   Lysosome   Hint       3. 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.   Nuclear Membrane   Chromoplast   Nucleolus   Endoplasmic Reticulum   Half-n-half Clue   4. 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.   Chromoplast   Cytoplasm   Cell Wall   Mitochondrion   Half-n-half Clue   5. It performs intracellular digestion. It also helps in destroying foreign substances.   Cell Wall   Cell Membrane   Lysosome   Nucleoplasm   Half-n-half Clue   6. It initiates and regulates cell division. It also helps in forming spindle fibres, with the help of asters.   Nucleoplasm   Centrosome   Ribosome   Nucleus   Half-n-half Clue   7. It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   Nucleolus   Mitochondrion   Cytoplasm   Lysosome   Half-n-half Clue