Protists (22)

Protists (22) - Kingdom Protista General Biology Domain...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Kingdom Kingdom Protista Protista
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
General Biology General Biology Morphology: All life activities carried on within limits of one membrane - Most unicellular and microscopic; specialized organelles - Many with amazingly high level of structural and functional complexity Life Cycles: Asexual reproduction common Sexual reproduction may occur when conditions deteriorate Some life cycles simple, many extremely complex
Background image of page 2
Ecological Importance Protists are of enormous ecological importance! Photoautotrophic forms: Produce oxygen Function as producers in both freshwater and saltwater ecosystems Major component of plankton Organisms that are suspended in the water Serve as food for heterotrophic protists and animals Many protists are symbionts Ranges from strict parasitism to mutualism Coral reefs greatly aided by symbiotic photoautotrophic protists in tissues of corals Some with great medical improtance
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Evolution Evolution Complexity and diversity of protists makes them difficult to classify Many classification schemes proposed None has broad support Cannot be classified as plants, animals, or fungi Plant-like:multicellular algae are not plants; do not protect gametes/zygote from dessication Fungi-like: lack flagella, no chitin in cell wall Animal-like: heterotrophs but no embryonic development Could be split into as many as a dozen kingdoms. The scheme chosen for this discussion is based on modes of nutrition
Background image of page 4
Mode of Nutrition Photoautotrophs - green, red, brown algae - diatoms, - dinoflagellates - euglenoids Heterotrophs - zooflagellates - amoeboids - foraminferans, - - radiolarians - cilates - sporozoans - plasmodial + cellular slime molds Saprotrophs - water molds Protist Diversity Protist Diversity
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 18

Protists (22) - Kingdom Protista General Biology Domain...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online