1. It has a double-walled structure. Its inner wall is produced into folds known as cristae. It is generally sausage-shaped.   Nuclear Membrane   Mitochondrion   Nucleoplasm   Chloroplast   Hint Half-n-half Clue   2. It is chiefly composed of a dense fluid. It contains chromatin fibres, which are made up of DNA (Deoxyribonucleic acid).   Nuclear Membrane   Smooth Endoplasmic Reticulum   Nucleoplasm   Chloroplast   Half-n-half Clue   3. It is a clear space filled with water or other substances in the form of solutions. It has a covering called tonoplast.   Nucleolus   Vacuole   Smooth Endoplasmic Reticulum   Nucleoplasm   Hint       4. It is a colorless plastid. It contains starch.   Golgi Apparatus   Rough Endoplasmic Reticulum   Cytoplasm   Leucoplast   Half-n-half Clue   5. It is a green-colored plastid. It contains a pigment called chlorophyll.   Nuclear Membrane   Vacuole   Chloroplast   Golgi Apparatus   Hint       6. It is the largest cell organelle. It has a dense structure. It is spherical in shape.   Nucleus   Chloroplast   Centrosome   Vacuole   Hint       7. It is round in shape. It is contained in the nucleus of the cell.   Nucleus   Nucleolus   Golgi Apparatus   Vacuole   Half-n-half Clue