1. Nucleus   It contains one or two centrioles, and is surrounded by microtubules or the centrosphere. It is situated near the nucleus.   It is the largest cell organelle. It has a dense structure. It is spherical in shape.   It has a non-living, rigid structure. It is freely permeable and is chiefly composed of cellulose.   It is made up of stacks of flattened membranous sacs. It mainly consists of vesicles, vacuoles and tubules.   Hint Hint       2. Chromoplast   It has a double-walled structure. Its inner wall is produced into folds known as cristae. It is generally sausage-shaped.   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 is a clear space filled with water or other substances in the form of solutions. It has a covering called tonoplast.   It has a small, dense and granular structure. It is spherical in shape and is single-walled.   Half-n-half Clue   3. Nuclear Membrane   It consists of an irregular network of double-walled tubular membrane. It does not have ribosomes attached to it.   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.   It has numerous pores, making it semi-permeable. It is the covering of the nucleus of the cell.   Half-n-half Clue   4. Cell Membrane   It is a membranous sac budded off from the golgi apparatus. It contains several types of enzymes.   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 non-living, rigid structure. It is freely permeable and is chiefly composed of cellulose.   Hint       5. Nucleolus   It is round in shape. It is contained in the nucleus of the cell.   It is a green-colored plastid. It contains a pigment called chlorophyll.   It is a colorless plastid. It contains starch.   It has numerous pores, making it semi-permeable. It is the covering of the nucleus of the cell.   Half-n-half Clue   6. Chloroplast   It is a green-colored plastid. It contains a pigment called chlorophyll.   It consists of an irregular network of double-walled tubular membrane. It does not have ribosomes attached to it.   It has a non-living, rigid structure. It is freely permeable and is chiefly composed of cellulose.   It is chiefly composed of a dense fluid. It contains chromatin fibres, which are made up of DNA (Deoxyribonucleic acid).   Hint       7. Ribosome   It is a membranous sac budded off from the golgi apparatus. It contains several types of enzymes.   It is a colorless plastid. It contains starch.   It has a small, dense and granular structure. It is spherical in shape and is single-walled.   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).   Hint