Economic importance of Algae :
(a) Agar is obtained commercially from Gelidium and Gracilaria which is widely used in the preparation of jellies, puddings, cream etc.
(b) Some brown algae are menace for shipping.
(c) Some species of Porphyra, Laminaria and Sargassum are used as food.
(d) An antibiotic chlorellin is extracted out from Chlorella.
Economic importance of Gymnosperm:
(a) Conifers provide enomorous amount of soft wood for construction, plywood, paper industry etc.
(b) Seeds of Pinus (Chilgoza) are edible.
(c) Saw dust of conifers is used in making linoleum and plastics.
(d) Ephedrine drug is obtained from Ephredra used in asthma.