1. Lysosome   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.   It performs intracellular digestion. It also helps in destroying foreign substances.   It initiates and regulates cell division. It also helps in forming spindle fibres, with the help of asters.   Hint Half-n-half Clue   2. Leucoplast   It is a plastid. It helps in the storage of starch.   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 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.   Half-n-half Clue   3. Chloroplast   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 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.   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.   Hint       4. Nucleolus   It synthesizes proteins by producing and storing RNA (Ribonucleic acid). At the same time, it orders ribosomes to synthesize proteins.   It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   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.   Half-n-half Clue   5. Nucleus   It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   It contains chromatin fibres, which are made up of DNA (Deoxyribonucleic acid). After cell division takes place, these chromatin fibres undergo certain structural changes, and are called chromosomes. These chromosomes carry the hereditary information of the genes.   It is known as the 'site of protein synthesis in the cell', and synthesizes proteins. It is chiefly composed of RNA (Ribonucleic acid).   It controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   Hint       6. Nucleoplasm   It provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   It synthesizes proteins by producing and storing RNA (Ribonucleic acid). At the same time, it orders ribosomes to synthesize proteins.   It performs intracellular digestion. It also helps in destroying foreign substances.   It contains chromatin fibres, which are made up of DNA (Deoxyribonucleic acid). After cell division takes place, these chromatin fibres undergo certain structural changes, and are called chromosomes. These chromosomes carry the hereditary information of the genes.   Half-n-half Clue   7. Vacuole   It helps in the storage of water and several other substances, namely food, waste products and pigments. It also provides turgidity to the cell.   It controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   It synthesizes and secretes certain substances, namely hormones and enzymes. It also helps in the formation of acrosome of sperm.   It performs intracellular digestion. It also helps in destroying foreign substances.   Hint