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