Protists

Text Book Section 16.12 – answer the questions on the back of the reading. Then look under the microscopes at two different protists and draw what you see. 1. How do scientists now classify/group protists? 2. What are the different methods protists use for obtaining energy? 3. Where are protists found?

Microbial life: Prokaryotes and Protists Protists are a Kingdom within Eukarya Protists are mostly single celled, some colonial or multicellular More complex than the Archaea and Bacteria

Recall Classification Life Archaea Bacteria Eukarya Archaea Bacteria Protista Plantae Fungi Animalia

Protista A eukaryote that is not a plant, animal, or fungi, it is often single-celled Some of the most complex and elaborate cells in world

protista Often living in wet environments Incredible diversity of protists Can be grouped in many ways, more and more is discovered about protists each year

Obtaining Energy ‘self-feeding’ ‘other feeding’ ‘mixed feeding’

Groupings ‘Plant like’ Protists and ‘Animal like’ Protists simplified version, but scientists are still discovering the best way to classify and have many different hypotheses

Plant-like Protists Contain chlorophyll and can carry out photosynthesis

autotrophy Produce their food through photosynthesis Algae is most common Can be multicellular

autotrophy Brown Algae – common name is kelp Can grow up to 60 meters Provides food source and habitat for marine organisms

autotrophy Diatoms Unicellular algae one of most important photosynthetic organisms on Earth Contains silica in the cell wall Used in toothpaste, polishing agents, water filters,

Diatoms

Dinoflagellates “two flagella” Common component of plankton (groups of organisms living near the water’s surface) “blooms” occur when there is an increase in nitrogen and phosphorus forming a “Red Tide”

dinoflagellate

Dinoflagellates can produce neurotoxins that harm the organisms eating them.