ALGAE • 1st plants to appear on earth • Multicellular • Non Vascular • No true root, stems, leaves, or tubes to transport materials • No seeds • Must live in or near water • 3 types of algae separated by pigment color
TYPES OF ALGAE • Brown Algae • Red Algae • Green Algae
BROWN ALGAE • Float on or near surface of salt water • Held up by sacs called Air Bladders • Provide home for many sea animals • Ex. • Sargassum, kelp, rockweed
BROWN ALGAE • USES: • Food for humans and livestock • Algins • used in salad dressings to make them smooth and keep them from separating • Thickening agent in ice cream and marshmellows
RED ALGAE • Many different shapes • Clumps of delicate red threads • Large rounded, flat sheets • Hard stiff branches • Usually grow attached to rocks • Live deeper in the ocean than any other algae
RED ALGAE • Red pigments transfer the small amount of light to the chlorophyll for photosynthesis • Uses: • Food • Fertilizer • Carrageenans: in foods, jellies, lotions • Agar- used in science labs
GREEN ALGAE • Live in freshwater • Some live with Fungi (Lichen) • Some live in the bodies of worms, sponges , or protists • Land plants are believed to have evolved from green algae
GREEN ALGAE • Land plants are believed to have evolved from green algae -have similar life cycles, pigments and stored food supplies.