Plant-like ProtistsPlant-like Protists

PhytoplanktonPhytoplankton All are photosyntheticAll are photosynthetic Sessile algaeSessile algae Are classified according to Are classified according to their unique characteristicstheir unique characteristics

PhytoplanktonPhytoplankton

We will study 2 plant-like protists:We will study 2 plant-like protists:

1.1. Euglena (flagellate)Euglena (flagellate)

2.2. Spirogyra (sessile algae)Spirogyra (sessile algae)

EuglenaEuglena

Euglena gracilisEuglena gracilis Division EuglenophytaDivision Euglenophyta

Movement – use of flagellumMovement – use of flagellum - - can also move by changing can also move by changing

it’s shape in a process called it’s shape in a process called “euglenoid” movement“euglenoid” movement

EuglenaEuglena

Food – PhotosyntheticFood – Photosynthetic– 6CO6CO2 2 + 6H+ 6H22O O CC66HH1212OO6 6 + 6O+ 6O22

– Euglena can switch to being Euglena can switch to being heterotrophic if they can’t find any light heterotrophic if they can’t find any light (now that’s cool!)(now that’s cool!)

EuglenaEuglena

Reproduction – Asexual binary Reproduction – Asexual binary fissionfission

Special Structures Special Structures

1.1. Flagellum – locomotionFlagellum – locomotion

2.2. Chloroplasts – site of Chloroplasts – site of photosynthesisphotosynthesis

3.3. Eye spot – light sensitive pigmentEye spot – light sensitive pigment

EuglenaEuglena

SpirogyraSpirogyra

Spirogyra ternatumSpirogyra ternatum Division ChlorophytaDivision Chlorophyta

Movement – sessileMovement – sessile

Food – PhotosynthesisFood – Photosynthesis (You write the equation) (You write the equation)

SpirogyraSpirogyra

Reproduction – filaments of spirogyra line Reproduction – filaments of spirogyra line up and connect with up and connect with conjugation tubes. conjugation tubes.

All the contents of the All the contents of the donordonor cell pass cell pass through the tube into the through the tube into the recipientrecipient cell cell

The donor cell is now a dead, empty cellThe donor cell is now a dead, empty cell Since the filamentous cells are considered Since the filamentous cells are considered

haploid (n), the recipient cell is now haploid (n), the recipient cell is now considered a zygote (2n) considered a zygote (2n)

Conjugation continuedConjugation continued

The zygote becomes protected by a The zygote becomes protected by a ZygosporeZygospore

Eventually the zygote divides by Eventually the zygote divides by meiosis to produce more haploid meiosis to produce more haploid cellscells

SpirogyraSpirogyra

Special structures Special structures

1.1. Conjugation tubeConjugation tube

2.2. Spiraling chloroplastSpiraling chloroplast

3.3. ZygoteZygote

4.4. Zygospore Zygospore

SpirogyraSpirogyra

Other PhytoplanktonOther Phytoplankton

Volvox – Division ChlorophytaVolvox – Division Chlorophyta

Other PhytoplanktonOther Phytoplankton

Diatoms – Division ChrysophytaDiatoms – Division Chrysophyta

MycoplanktonMycoplankton

Fungus-like ProtistsFungus-like Protists

Slime moldsSlime molds

Colonial organismsColonial organisms

Terrestrial decomposersTerrestrial decomposers

Slime MoldsSlime Molds