Algae

1. Algae Ben, Anna, Pranavi

2. Phaeophyceae orBrown Algae • It consists of Multi cellular marine algae , that is mostly kelps • There are around 1500–2000 species of brown algae • Famous for the 4 membranes around their chloroplasts • It differs in size from a few cells to the giant kelp that can grow up to 45 feet • One thing that separates them from other algae is that all brown algae are multi cellular

3. Structure of Brown Algae • The holdfasts are for anchoring themselves to the bottom of the ocean • The Float keeps it above the water • The Stipe Is the Structure of the Brown Algae or kelp • It lacks a  xylem and phloem

4. Red Algae • Lack flagella; gametes rely on water currents to get together • Have phycoerythrin pigment that makes them red • Not all are red; species differ in their proportions of accessory pigments. • Most abundant in warm, coastal waters of tropical oceans, deep as 260 m • Dulse - edible species with leafy form • Irish moss- used in ice cream Dulse Irish moss

5. Mostly aquatic Photosynthetic Plantae Structure Alternation of generations Green Volvox Type of green algae Spherical colony (500-50,000 cells) Movement: flagella Freshwater Protoplasmates Asexual reproduction: gonidium cells divide and make daughter colonies, flagella are inwards, invert when size of parents, parents die Sexual reproduction: gonidium cells make sperm and egg cells Green Algae

6. Euglena • Protist • aquatic • Unicellular flagellate • Heterotrophic (phagocytosis) and autotrophic characteristics • 3 membrane chloroplasts (from green algae), eyespot • Binary fission Sea Lettuce • type of green algae • Edible • Emits hydrogen sulphide when decomposing http://www.youtube.com/watch?v=5fg3Q-hbSsI

7. Alternation of Generations • Green algae and red algae