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Caffeine is a mild stimulant that increases mental activities.
Papain contains proteolytic substance used as food tenderizer.
Quinine is used as an anti-malaria drug.
Economic importance of plant excretory products include;Tannis - Used in the treatment of leather; combines with animal protein to form a complex compound that is not easily broken down by animal proteases deposited on dead tissue of wood and barks of trees e.g Acacia, mangroove and wattle trees.Caffeine - Taken as a mild stimulant that increases mental activity and reduces fatigue found in coffee berries and tea leaves.Quinine - Used in the treatment of malaria. It is also found in the back of the cinchona tree and aloe vera leaves.Cocaine - Used as a local anaesthetic if taken in large quantities causes great physical and mental defect, addiction and heart disease. Found in leaves of cocoa plant.Cannabis - Extracted and used in the manufacture of drugs; stored in fruits, flowers and leaves of cannabis sativa.Nicotine - Used in the manufacture of insecticides and narcortic drugs; found in the leaves of tobacco plant.Rubber - Used in the shoe, tyre industry; obtained form latex of rubber plant.Gum Arabica - Used in food processing and printing industry; is an exudate from a variety of acacia trees.Colchicine - Used to induce polyploidism in plants and cancer therapy; it os an alkaloid derived from the plant used in genetics in plants and animal breeding researchPapain - Contains proteolytic substance used in the food industry as a meat tenderizer; It is an alkaloid obtained from raw pawpaw fruit skin.Khat - Is a mild stimulant used from medical purposes; obtained from catha edulis (miraa)Morphine - Used as a pain killer and anaesthesia to make patients sense dull and relax; obtained from poppy plant.Heroin - Induces drug dependence hence addictive; it is a drug obtained from morphine and uses as a narcotic.
Opportunity cost is the value of foregone best alternative/revenue as result of choosing the best alternative.