Ch 2.1: Protozoa Plant like - Algae Presented by Mr.J.Mulligan

Objectives Describe the characteristics of algae Compare 6 groups of algae Discuss importance of algae to humans

Algae Different from Protozoa Contain chlorophyll and cells walls You use or eat Algae everyday!

Algae contains pigments Pigments are colored substances that absorb light Chlorophyll = green Carotenoids = red, orange, yellow Fucoxanthin = brown Pigments are colored substances that absorb light Chlorophyll = green Carotenoids = red, orange, yellow Fucoxanthin = brown

6 major groups Euglena Dinoflagellates Diatoms Green Algae Brown Algae Red Algae How do you think scientists classified these groups of Algae?

Euglena One celled algae with flagellum Eyespot is red and senses light for Photosynthesis When it is dark they eat Monerans and other Protists No cell wall One celled algae with flagellum Eyespot is red and senses light for Photosynthesis When it is dark they eat Monerans and other Protists No cell wall

Dinoflagellates One celled algae with 2 flagella Spin through water May cause a Red Tide which kills marine life and make people sick

Diatoms 1 celled with cell wall made of silica (glass) May contain pigments When they die, they sink to the bottom of the ocean and people harvest them. 1 celled with cell wall made of silica (glass) May contain pigments When they die, they sink to the bottom of the ocean and people harvest them.

Diatoms

Green Algae One celled, live in colonies or multicellular Green plants evolved from this group Examples: Spirogyra, volvox and ulva

Brown Algae Holdfast anchors it to rocks Blades photosynthesize Stalk is for support Gas filled bladders help it float like swimmies Examples: Giant kelp, rockweed Holdfast anchors it to rocks Blades photosynthesize Stalk is for support Gas filled bladders help it float like swimmies Examples: Giant kelp, rockweed

Red Algae Can also be purple, black or even green! Can grow deep and still absorb sun Branching bodies; feathery and delicate

Human uses for Algae Adds ‘grit’ to toothpaste and cleaners Keeps products smooth liked paint, ice cream, pudding, shampoo and lotion Diatomaceous Earth in filters to clean pools