1. Nucleus   It is the largest cell organelle. It has a dense structure. It is spherical in shape.   It is chiefly composed of a dense fluid. It contains chromatin fibres, which are made up of DNA (Deoxyribonucleic acid).   It consists of an irregular network of double-walled tubular membrane. It has ribosomes attached to it.   It has a living, flexible and thin structure. It possesses fine pores, making it semi-permeable. It is chiefly composed of lipo-proteins.   Hint Hint       2. Golgi Apparatus   It is chiefly composed of a dense fluid. It contains chromatin fibres, which are made up of DNA (Deoxyribonucleic acid).   It has a vesicular structure. It is formed when the substances produced in the endoplasmic reticulum are further processed in the golgi apparatus.   It is made up of stacks of flattened membranous sacs. It mainly consists of vesicles, vacuoles and tubules.   It is round in shape. It is contained in the nucleus of the cell.   Hint       3. Vacuole   It is a clear space filled with water or other substances in the form of solutions. It has a covering called tonoplast.   It is a membranous sac budded off from the golgi apparatus. It contains several types of enzymes.   It is chiefly composed of a dense fluid. It contains chromatin fibres, which are made up of DNA (Deoxyribonucleic acid).   It is a colorless plastid. It contains starch.   Hint       4. Nucleolus   It is a plastid that is colored differently in different cells. It contains pigments such as xanthophyll (yellow in color) and carotene (orangish-red in color).   It contains one or two centrioles, and is surrounded by microtubules or the centrosphere. It is situated near the nucleus.   It is chiefly composed of a dense fluid. It contains chromatin fibres, which are made up of DNA (Deoxyribonucleic acid).   It is round in shape. It is contained in the nucleus of the cell.   Half-n-half Clue   5. Secretory Granule   It is a membranous sac budded off from the golgi apparatus. It contains several types of enzymes.   It has a small, dense and granular structure. It is spherical in shape and is single-walled.   It has a vesicular structure. It is formed when the substances produced in the endoplasmic reticulum are further processed in the golgi apparatus.   It is a clear space filled with water or other substances in the form of solutions. It has a covering called tonoplast.   Half-n-half Clue   6. Ribosome   It is a green-colored plastid. It contains a pigment called chlorophyll.   It has a living, flexible and thin structure. It possesses fine pores, making it semi-permeable. It is chiefly composed of lipo-proteins.   It consists of an irregular network of double-walled tubular membrane. It has ribosomes attached to it.   It has a small, dense and granular structure. It is spherical in shape and is single-walled.   Hint       7. Cell Membrane   It has a living, flexible and thin structure. It possesses fine pores, making it semi-permeable. It is chiefly composed of lipo-proteins.   It is a green-colored plastid. It contains a pigment called chlorophyll.   It has a double-walled structure. Its inner wall is produced into folds known as cristae. It is generally sausage-shaped.   It is round in shape. It is contained in the nucleus of the cell.   Hint