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Cellulose, a polysaccharide, is the primary structural component of plant cell walls.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Proteins and Polysaccharides - Structure and Functions
Algal walls may contain cellulose, galactans, mannans and minerals such as calcium carbonate. In other plants, the wall is composed of cellulose, hemicellulose, pectins and proteins.
Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Eukaryotic Cell - Cell Wall and Cell Membrane - Fluid Mosaic Model
Go with C — Phenylpropanoids. Under PLANT SEC METABOLITES, this is the standard explanation you’d use in class: it names the real driver or definition, while the rest are nearby but wrong. Not these: A) Fatty acids; B) Terpenes; D) Sugars. When two options sound similar, choose the one that matches the textbook definition most tightly.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.
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