1. It has a small, dense and granular structure. It is spherical in shape and is single-walled.   Hint Hint       2. It is a colorless plastid. It contains starch.   First letter clue   3. It is a green-colored plastid. It contains a pigment called chlorophyll.   Hint       4. It has a living, flexible and thin structure. It possesses fine pores, making it semi-permeable. It is chiefly composed of lipo-proteins.   Hint       5. 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).   First letter clue   6. It is made up of stacks of flattened membranous sacs. It mainly consists of vesicles, vacuoles and tubules.   Hint       7. It consists of an irregular network of double-walled tubular membrane. It does not have ribosomes attached to it.   First letter clue