Cell Wall Structure and Functions — NEET Biology
📚 Practice ConceptAs you may recall, a non-living rigid structure called the cell wall forms an outer covering for the plasma membrane of fungi and plants. Cell wall not only gives shape to the cell and protects the cell from mechanical damage and infection, it also helps in cell-to-cell interaction and provides barrier to undesirable macromolecules. Algae have cell wall, made of cellulose, galactans, mannans and minerals like calcium carbonate, while in other plants it consists of cellulose, hemicellulose, pectins and proteins. The cell wall of a young plant cell, the primary wall is capable of growth, which gradually diminishes as the cell matures and the secondary wall is formed on the inner (towards membrane) side of the cell.
Which of the following statements accurately describe the plant cell wall and its related structures? S1: The primary cell wall of a young plant cell is formed after the secondary wall and is capable of extensive growth. S2: The middle lamella, primarily composed of calcium carbonate, forms the outer covering of individual plant cells. S3: Plant cell walls are non-living rigid structures that provide mechanical support and protection from infection. S4: Plasmodesmata are intercellular junctions that connect the cytoplasm of neighboring plant cells through openings in the cell wall and middle lamella. S5: The cell walls of algae are exclusively composed of cellulose, unlike other plants which contain additional components like hemicellulose and pectins.
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