The kingdom protista
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The Kingdom Protista. It’s A Small World!. Click here to see a live protist .

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The Kingdom Protista

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The Kingdom Protista

It’s A Small World!

Click here to see a live protist


When we were a soft amoeba, in ages past and gone, Ere you were the Queen of Sheba and I King Solomon Alone and undivided, we lived a life of sloth Whatever you did I did; one dinner served us both. Anon came separation, by fission and divorce, A lonely pseudopodium I wandered on my course.

~Sir Arthur Shipley


Protozoans: Animal-like Protists

  • Grouped by movement

  • Mostly asexual means of reproduction

  • Unicellular

  • Once were classified as animals

  • Many cause disease


Phylum Sarcodina

  • Amoeba

  • “The Blob”

  • Pseudopodia

  • Phagocytic/Pinocytic

  • Slow

  • Some pathogenic forms

  • Entertaining

Click here for ameboid movement movie


Phylum Zoomastigina

  • Mast-like flagella

  • Some parasitic

  • Some helpful (termites)


Phylum Ciliophora

  • Numerous cilia for movement and for gathering food

  • Aquatic

  • Asexual and Sexual (conjugation)

  • Torpedo movement

Paramecium moving. Click to see


Conjugation

Two paramecia come together and exchange genetic material through their oral grooves. After becoming genetically altered in this way, they separate and each goes on to divide asexually.


Mini-Soaps?


Phylum Sporozoa

  • Parasitic

  • Non-motile

  • Most produce spores

  • Complex life cycles

  • Malarial Plasmodium is an example

  • See next slide for Malaria Cycle


Algae: Plant-like Protists

  • Uni- or Multicellular

  • Photosynthetic

  • Once classified in Plantae Kingdom but no roots, stems, leaves

  • Highly pigmented

  • Base of most food chains


Phylum Euglenophyta

  • Unicellular

  • Aquatic

  • Photosynthetic (autotrophic) and heterotrophic

  • Double movement: flagella and flexing euglenoid movement

Click here to watch euglena move about


Euglenoid Movement

By alternation of flexing and extending the pellicle, the euglenoid is capable of this type of movement in its aquatic environment. The flagellum is also of assistance in movement and food gathering.


Phylum BacillariophytaDiatoms: the Golden Algae

  • Unicellular

  • Silica shell cases (like pillboxes with lids

  • Photosynthetic autotrophs

  • Marine and aquatic (phytoplankton)

  • Asexual and sexual forms of reproduction

  • Diatomaceous earth


…….to this

From this………..


Phylum DinoflagellataThe Spinning Algae

  • Unicellular

  • Thick cellulose plate cell walls

  • Double flagella

  • Mostly oceanic phytoplankton

  • Autotrophic symbionts

  • Red tide!


……THIS!

This may lead to……….


Phylum RhodophytaThe Red Algae

  • Multicellular

  • Seaweed

  • Attach to rock

  • Photosynthetic by phycobilins (absorb green, violet and blue light rays of deeps)


Phylum PhaeophytaThe Brown Algae

  • Multicellular

  • Marine

  • Contain chlorophyll and fucoxanthin

  • Thallus body form

  • Kelp forms dense underwater forests

  • Sargassum forms dense floating mats


Phylum ChlorophytaThe Green Algae

  • Mostly aquatic, some marine (some out of water, see next slide)

  • Photosynthetic with chlorophyll

  • Largest group

  • Colonial types, too


Typical Algae Reproductive Cycle


The Fungus-like Protists

  • Formerly classified in the Kingdom Fungi

  • Decomposers

  • Some damage crops

  • Slime molds are plasmodial(Myxomycota) or cellular(Acrasiomycota)

  • Water molds/Downy Mildew (Oomycota)


The cellular slime molds are unicellular, colonial, and multicellular at different stages of their life cycles. They thrive in moist environments with bacteria, usually on decaying organic matter.


Most water molds appear as white, fuzzy growths on decaying matter. The downy mildews appear similarly, but on living plant surfaces as above.


THE END


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