1. Vacuole   It performs intracellular digestion. It also helps in destroying foreign substances.   It provides support to the cell. It also helps in the synthesis and transport of proteins and fats.   It is semi-permeable, allowing substances to enter and leave the nucleus of the cell. It also provides protection to the nucleus of the cell.   It helps in the storage of water and several other substances, namely food, waste products and pigments. It also provides turgidity to the cell.   Hint Hint       2. Nuclear Membrane   It is semi-permeable, allowing substances to enter and leave the nucleus of the cell. It also provides protection to the nucleus of the cell.   It is a plastid, containing a pigment called chlorophyll. This chlorophyll captures energy from sunlight and helps in the manufacture of food by the process of photosynthesis.   It is a plastid, containing pigments such as xanthophyll (yellow in color) and carotene (orangish-red in color). These pigments impart color to flowers and fruits of plants.   It synthesizes and secretes certain substances, namely hormones and enzymes. It also helps in the formation of acrosome of sperm.   Half-n-half Clue   3. Chromoplast   It is known as the 'site of protein synthesis in the cell', and synthesizes proteins. It is chiefly composed of RNA (Ribonucleic acid).   It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   It is a plastid, containing a pigment called chlorophyll. This chlorophyll captures energy from sunlight and helps in the manufacture of food by the process of photosynthesis.   It is a plastid, containing pigments such as xanthophyll (yellow in color) and carotene (orangish-red in color). These pigments impart color to flowers and fruits of plants.   Half-n-half Clue   4. Nucleolus   It provides protection, shape and rigidity to the cell. It is freely permeable, allowing substances in the form of solutions to enter and leave the cell without any hindrance.   It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   It is a plastid. It helps in the storage of starch.   It synthesizes proteins by producing and storing RNA (Ribonucleic acid). At the same time, it orders ribosomes to synthesize proteins.   Half-n-half Clue   5. Golgi Apparatus   It is the house of all metabolic activities and functions in the cell. In other words, it contains most of the cell organelles, each of which perform a specific function.   It is a plastid, containing pigments such as xanthophyll (yellow in color) and carotene (orangish-red in color). These pigments impart color to flowers and fruits of plants.   It provides protection, shape and rigidity to the cell. It is freely permeable, allowing substances in the form of solutions to enter and leave the cell without any hindrance.   It synthesizes and secretes certain substances, namely hormones and enzymes. It also helps in the formation of acrosome of sperm.   Hint       6. Leucoplast   It provides protection, shape and rigidity to the cell. It is freely permeable, allowing substances in the form of solutions to enter and leave the cell without any hindrance.   It synthesizes and secretes certain substances, namely hormones and enzymes. It also helps in the formation of acrosome of sperm.   It synthesizes proteins by producing and storing RNA (Ribonucleic acid). At the same time, it orders ribosomes to synthesize proteins.   It is a plastid. It helps in the storage of starch.   Half-n-half Clue   7. Cell Membrane   It is a plastid. It helps in the storage of starch.   It provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   It synthesizes and secretes certain substances, namely hormones and enzymes. It also helps in the formation of acrosome of sperm.   It initiates and regulates cell division. It also helps in forming spindle fibres, with the help of asters.   Hint