- A Processed industrially as a renewable source of crude petroleum
- B Used as food (nori in Japanese cuisine) and for agar production
- C Harvested commercially as a source of structural timber for construction
- D Cultivated solely as a source of pharmaceutical-grade medicinal compounds
Correct answer: B. Used as food (nori in Japanese cuisine) and for agar production
Explanation: Porphyra is eaten as nori (dried sheets used in sushi). Red algae also provide agar (from Gelidium) used in microbiology and food industry, and carrageenan (from Chondrus) used as a food thickener.
Concept context
Classification of plants from algae to angiosperms. Understanding plant diversity is essential for NEET.