Solution:

Importance of Gymnosperms

(i) Gymnosperms are utilised as decorative plants. Some are bonsai trees that can be found in formal gardens.

(ii) The fibres from these plants are used to make paper pulp.

(iii) Conifers produce turpentine and resins

(iv) Gymnosperms such as junipers, pines, hemlock, fir, spruces, and arborvitae provide useful oils.

(v) Gymnosperm seeds are utilised in bakery items and other foods.

(vi) Used to make silk and other fabrics on occasion

Importance of Algae

(i) Algae use photosynthesis to fix carbon dioxide

(ii) they increase the amount of dissolved oxygen in their immediate environment; and

(iii) they produce rich chemicals that serve as food for aquatic creatures.

(iv) Food is made from marine algae. Laminaria and Sargassum, for example.

(v) Hydrocolloids are made from algae.

(vi) Agar is a type of agar that is used to grow bacteria and make jellies.

(vii) Space explorers eat chlorella as a dietary source.