Plant-like Protists

1. Plant-like Protists Phytoplankton All are photosynthetic Sessile algae Are classified according to their unique characteristics

2. Phytoplankton • We will study 2 plant-like protists: • Euglena (flagellate) • Spirogyra (sessile algae)

3. Euglena • Euglena gracilis • Division Euglenophyta • Movement – use of flagellum • - can also move by changing it’s shape in a process called “euglenoid” movement

4. Euglena • Food – Photosynthetic • 6CO2 + 6H2O C6H12O6 + 6O2 • Euglena can switch to being heterotrophic if they can’t find any light (now that’s cool!)

5. Euglena • Reproduction – Asexual binary fission • Special Structures • Flagellum – locomotion • Chloroplasts – site of photosynthesis • Eye spot – light sensitive pigment

6. Euglena

7. Spirogyra • Spirogyra ternatum • Division Chlorophyta • Movement – sessile • Food – Photosynthesis • (You write the equation)

8. Spirogyra • Reproduction – filaments of spirogyra line up and connect with conjugation tubes. • All the contents of the donor cell pass through the tube into the recipient cell • The donor cell is now a dead, empty cell • Since the filamentous cells are considered haploid (n), the recipient cell is now considered a zygote (2n)

9. Conjugation continued • The zygote becomes protected by a Zygospore • Eventually the zygote divides by meiosis to produce more haploid cells

10. Spirogyra • Special structures • Conjugation tube • Spiraling chloroplast • Zygote • Zygospore

12. Spirogyra

13. Other Phytoplankton • Volvox – Division Chlorophyta

14. Other Phytoplankton • Diatoms – Division Chrysophyta

15. Mycoplankton • Fungus-like Protists • Slime molds • Colonial organisms • Terrestrial decomposers

16. Slime Molds