1. Centrosome   It is chiefly composed of a dense fluid. It contains chromatin fibres, which are made up of DNA (Deoxyribonucleic acid).   It contains one or two centrioles, and is surrounded by microtubules or the centrosphere. It is situated near the nucleus.   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 Half-n-half Clue   2. Chloroplast   It has a vesicular structure. It is formed when the substances produced in the endoplasmic reticulum are further processed in the golgi apparatus.   It consists of an irregular network of double-walled tubular membrane. It does not have ribosomes attached to it.   It is a green-colored plastid. It contains a pigment called chlorophyll.   It has numerous pores, making it semi-permeable. It is the covering of the nucleus of the cell.   Hint       3. Leucoplast   It contains most of the cell organelles. It is composed of a mixture of water and soluble organic & inorganic compounds.   It is a colorless plastid. It contains starch.   It contains one or two centrioles, and is surrounded by microtubules or the centrosphere. It is situated near the nucleus.   It is a green-colored plastid. It contains a pigment called chlorophyll.   Half-n-half Clue   4. Secretory Granule   It is the largest cell organelle. It has a dense structure. It is spherical in shape.   It has a vesicular structure. It is formed when the substances produced in the endoplasmic reticulum are further processed in the golgi apparatus.   It has a small, dense and granular structure. It is spherical in shape and is single-walled.   It is a membranous sac budded off from the golgi apparatus. It contains several types of enzymes.   Half-n-half Clue   5. Vacuole   It has a double-walled structure. Its inner wall is produced into folds known as cristae. It is generally sausage-shaped.   It is a green-colored plastid. It contains a pigment called chlorophyll.   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.   Hint       6. Lysosome   It is a membranous sac budded off from the golgi apparatus. It contains several types of enzymes.   It is a green-colored plastid. It contains a pigment called chlorophyll.   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 chiefly composed of a dense fluid. It contains chromatin fibres, which are made up of DNA (Deoxyribonucleic acid).   Half-n-half Clue   7. Smooth Endoplasmic Reticulum   It has a non-living, rigid structure. It is freely permeable and is chiefly composed of cellulose.   It has a small, dense and granular structure. It is spherical in shape and is single-walled.   It consists of an irregular network of double-walled tubular membrane. It does not have 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.   Half-n-half Clue