Q.Find the correct pair:

Economic Importance of Angiosperms

Angiosperms — the flowering plants — are the group humans depend on most. Beyond food, they supply an astonishing range of everyday products: medicines, rubber, spices, fibres, oils and gums. The reason is simple biology: flowering plants produce a huge diversity of secondary metabolites and specialised tissues, and different plants happen to make substances we find useful.

Products and their botanical sources

The most reliable way to learn this topic is to link each product to the exact plant (its genus) it comes from and the part used:

Why these substances exist in the plant

It is worth understanding that plants do not make quinine or rubber "for us." These are secondary metabolites — chemicals not directly needed for growth, but which help the plant defend itself against herbivores and infection (like bitter, toxic alkaloids), heal wounds (gums and latex sealing damaged bark), or repel pests. Human industry simply harvests these defensive or structural products.

The breadth of usefulness …