1. Mitochondrion   It initiates and regulates cell division. It also helps in forming spindle fibres, with the help of asters.   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.   It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   Hint Half-n-half Clue   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 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 a plastid. It helps in the storage of starch.   It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   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 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 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 performs intracellular digestion. It also helps in destroying foreign substances.   Half-n-half Clue   4. Nucleoplasm   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 helps in the storage of water and several other substances, namely food, waste products and pigments. It also provides turgidity to the cell.   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 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.   Half-n-half Clue   5. Nucleus   It controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   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 is a plastid. It helps in the storage of starch.   Hint       6. Leucoplast   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. It helps in the storage of starch.   It provides support to the cell. It also helps in the synthesis and transport of proteins and fats.   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. Ribosome   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 initiates and regulates cell division. It also helps in forming spindle fibres, with the help of asters.   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 known as the 'site of protein synthesis in the cell', and synthesizes proteins. It is chiefly composed of RNA (Ribonucleic acid).   Half-n-half Clue