1. Nucleus   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.   It controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   It is a plastid. It helps in the storage of starch.   Hint Hint       2. Nucleolus   It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   It synthesizes proteins by producing and storing RNA (Ribonucleic acid). At the same time, it orders ribosomes to synthesize proteins.   It controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   It provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   Half-n-half Clue   3. Nucleoplasm   It provides support to the cell. It also helps in the synthesis and transport of proteins and fats.   It synthesizes proteins by producing and storing RNA (Ribonucleic acid). At the same time, it orders ribosomes to synthesize proteins.   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 helps in the storage of water and several other substances, namely food, waste products and pigments. It also provides turgidity to the cell.   Half-n-half Clue   4. 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 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 provides support to the cell. It also helps in the synthesis and transport of proteins and fats.   It initiates and regulates cell division. It also helps in forming spindle fibres, with the help of asters.   Half-n-half Clue   5. Ribosome   It is known as the 'site of protein synthesis in the cell', and synthesizes proteins. It is chiefly composed of RNA (Ribonucleic acid).   It provides support to the cell. It also helps in the synthesis and transport of proteins and fats.   It provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   It initiates and regulates cell division. It also helps in forming spindle fibres, with the help of asters.   Half-n-half Clue   6. Chloroplast   It provides support to the cell. It also helps in the synthesis and transport of proteins and fats.   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 performs intracellular digestion. It also helps in destroying foreign substances.   It is known as the 'site of protein synthesis in the cell', and synthesizes proteins. It is chiefly composed of RNA (Ribonucleic acid).   Hint       7. Vacuole   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 the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   It is known as the 'site of protein synthesis in the cell', and synthesizes proteins. It is chiefly composed of RNA (Ribonucleic acid).   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