1. KEY CONCEPT Algae are plantlike protists.

2. Plantlike protists can be single-celled or multicellular.
Photosynthetic plantlike protists are called algae.
colony
daughter colony

3. Euglenoids are a large group of plantlike protists.
mostly photosynthetic
some heterotrophic
single-celled
one or two flagella
pellicle
nucleus
chloroplast
eye spot
contractile
vacuole
flagellum
Euglena

4. Dinoflagellates are mostly marine plantlike protists.
have two flagella
may be bioluminescent
have stiff protective plates
can cause red tide
Dinoflagellates

5. Diatoms are plantlike protists with glasslike shells.
shells made of silica; called tests
produce large amounts of oxygen

6. Multicellular algae are classified by their pigments.
Green algae contain chlorophyll a and b.
Have cellulose in cell walls
Spirogyra

7. Brown algae contain chlorophyll c.
Kelp,seaweeds

8. Red Algae
Red algae contain chlorophyll a and phycoerythrin.
Can grow deeper in ocean

9. Many plantlike protists can reproduce both sexually and asexually.
All algae can reproduce asexually.
Multicellular algae can fragment.
Chlamydomonas divides into zoospores.

10. Sexual reproduction can be triggered by environmental stress.
Some algae produce sexually.
Some species alternate generations between asexual and sexual reproduction.
May have a haploid life cycle where they spend most of their lives as haploid cells.
Sexual reproduction can be triggered by environmental stress.

11. Part of plankton, food in food webs Make oxygen Food for us Cosmetics
Benefits of algae
Part of plankton, food in food webs
Make oxygen
Food for us
Cosmetics
Biofuels
Make agar
For bacteria plates
For thickening ice cream and other foods
sushi