1. Nuclear Membrane   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 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 semi-permeable, allowing substances to enter and leave the nucleus of the cell. It also provides protection to the nucleus of the cell.   Hint Half-n-half Clue   2. Mitochondrion   It is a plastid. It helps in the storage of starch.   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 provides shape to the cell. It is semi-permeable, regulating the entry and exit of substances, namely solutes and ions.   It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   Half-n-half Clue   3. 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 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.   It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   Hint       4. Lysosome   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 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.   Half-n-half Clue   5. Leucoplast   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.   It performs intracellular digestion. It also helps in destroying foreign substances.   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.   Half-n-half Clue   6. Nucleolus   It performs intracellular digestion. It also helps in destroying foreign substances.   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 helps in the storage of water and several other substances, namely food, waste products and pigments. It also provides turgidity to the cell.   It synthesizes proteins by producing and storing RNA (Ribonucleic acid). At the same time, it orders ribosomes to synthesize proteins.   Half-n-half Clue   7. Nucleoplasm   It is a plastid. It helps in the storage of starch.   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.   It synthesizes and secretes certain substances, namely hormones and enzymes. It also helps in the formation of acrosome of sperm.   Half-n-half Clue