Gymnosperms are importance because :

A.Gymnosperms plants are used as ornamentals. Some are features in formal gardens – used for bonsai
B.Their fibers are used in the preparation of paper pulp.
C.Turpentine and resins are obtained from confers resins.
D.Useful oils are extracted from gymnosperms like junipers, pines, hemlock, fir, spruces, and arborvitae.
E.Gymnosperm seeds are used as food products such as bakery items.
F. Occasionally used to create silk and other textiles

Algae is important because :

A. Algae fixes Carbon dioxide with the help of photosynthesis

B. It increases the level of dissolved oxygen in their immediate environment

C. They produce rich compounds that serve as food for aquatic animals.
D.Marine algae are used as food. Eg: Laminaria and Sargassum
E.Certain algae are used as hydrocolloid
F.Agar is used in growing microorganisms and in the preparation of jellies.
G.Chlorella is used as food by space travelers.