1. Ribosome   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 controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   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 Half-n-half Clue   2. Endoplasmic Reticulum   It provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   It provides support to the cell. It also helps in the synthesis and transport of proteins and fats.   It is known as the 'site of protein synthesis in the cell', and synthesizes proteins. It is chiefly composed of RNA (Ribonucleic acid).   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   3. Nucleolus   It synthesizes proteins by producing and storing RNA (Ribonucleic acid). At the same time, it orders ribosomes to synthesize proteins.   It synthesizes and secretes certain substances, namely hormones and enzymes. It also helps in the formation of acrosome of sperm.   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 initiates and regulates cell division. It also helps in forming spindle fibres, with the help of asters.   Half-n-half Clue   4. Chloroplast   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.   It provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   It controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   Hint       5. 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 shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   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 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   6. Lysosome   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 performs intracellular digestion. It also helps in destroying foreign substances.   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. It helps in the storage of starch.   Half-n-half Clue   7. Golgi Apparatus   It synthesizes and secretes certain substances, namely hormones and enzymes. It also helps in the formation of acrosome of sperm.   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 shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   Hint