1. Cell Wall   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 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 controls and coordinates all the activities and functions of the cell. It plays a vital role in cell division.   Hint Hint       2. Mitochondrion   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 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 is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   Half-n-half Clue   3. Chromoplast   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, 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 support to the cell. It also helps in the synthesis and transport of proteins and fats.   It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   Half-n-half Clue   4. Lysosome   It synthesizes proteins by producing and storing RNA (Ribonucleic acid). At the same time, it orders ribosomes to synthesize proteins.   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 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   5. Endoplasmic Reticulum   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 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 provides support to the cell. It also helps in the synthesis and transport of proteins and fats.   Half-n-half Clue   6. Vacuole   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 site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   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.   Hint       7. Golgi Apparatus   It is the site of ATP (Adenosine triphosphate) synthesis. It also synthesizes respiratory enzymes.   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 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.   Hint