1. It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   Lysosome   Mitochondrion   Centrosome   Cell Wall   Hint Half-n-half Clue   2. 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   Endoplasmic Reticulum   Cytoplasm   Nuclear Membrane   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.   Golgi Apparatus   Nuclear Membrane   Chromoplast   Cytoplasm   Hint       4. 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.   Cell Wall   Golgi Apparatus   Ribosome   Chloroplast   Hint       5. It initiates and regulates cell division. It also helps in forming spindle fibres, with the help of asters.   Golgi Apparatus   Centrosome   Chromoplast   Lysosome   Half-n-half Clue   6. It is a plastid. It helps in the storage of starch.   Leucoplast   Cell Membrane   Golgi Apparatus   Vacuole   Half-n-half Clue   7. It is a plastid, containing a pigment called chlorophyll. This chlorophyll captures energy from sunlight and helps in the manufacture of food by the process of photosynthesis.   Chloroplast   Lysosome   Cell Membrane   Leucoplast   Hint