Download presentation
Presentation is loading. Please wait.
1
Chapter 11 Protists
2
Protista (Protists) Some are too tiny to be seen without a microscope while others are meters long Some are like animals, plants or fungi
3
General Characteristics
All are eukaryotic, have nuclei Most are single celled but some are multi cellular Scientists believe more complex organisms originated from protists
4
Protists Producers- get food through photosynthesis Consumers- get food from other sources Grouped by how they get food into 3 groups
5
Funguslike Protists Get food from dead organic matter Secrete juices into the food source and absorb the digested nutrients Reproduce like fungus
6
Slime Mold Thin masses of living matter
Colorful, shapeless globs of slime Live as single celled organisms, but congregate in times of stress
7
Slime molds Live in cool, shady moist places in the woods and fresh water Eat bacteria, yeast, small bits of decaying plants and animal matter
8
Unfavorable Conditions
Slime molds develop stalk-like structures with rounded knobs at the top (spores) The spores can survive a long time without nutrients until conditions improve
10
Water Molds Most are small and single celled
Live in water, moist soil or other organisms Decomposers or parasites Caused the Great Potato Famine
12
Plantlike Protists Producers Algae (alga) have chlorophyll (pigment for photosynthesis) and other pigments Almost all live in water
13
Seaweed or Kelp Multicellular algae Live near the shore Can grow to be meters in length
14
Phytoplankton Single celled algae Usually float near the surface
Produce most of the world’s oxygen Divided into phyla based on color and cell structure
16
Algin and Carageenan 2 substances extracted from algae used in many foods Including ice cream , salad dressing, jelly beans and instant pudding
17
Volvox An example specimen of green algae Single celled but live in colonies You will see in lab
19
Diatoms Single celled, unusual shapes Found in salt and fresh water
Contain silica (a glass-like substance) and cellulose Used in tooth paste and silver polish
21
Dinoflagellates Single celled, live primarily in salt water,
Have 2 flagella, whip-like strand used for movement Some are red and produce a poison which can cause red tides If fish eat enough of the poison, they can be toxic to humans
23
Euglenoids Single celled, live in fresh water, characteristics of plants and animals Use photosynthesis and consume food Have one flagella (whip-like tail) and contractile vacuoles
25
Grouped into 4 categories
Animal-like Protists Protozoa Grouped into 4 categories Amoebalike protists Flagellates Cilliates Spore forming protists
26
Amoebalike protists Soft jelly-like, contractile vacuoles
Move with psuedopodia (false feet) Feed by engulfing food Include Foraminiferans and Radiolarians (amoeba like with shells)
28
Flagellates Flagella for movement Parasites
Giardia lamblia found in water, affects hikers when drinking untreated water Another lives in the guts of termites to help them digest the cellulose in wood
30
Most complex protozoans
Cilliates Most complex protozoans Covered in tiny hair-like projections called cillia used for movement and feeding Best known is Paramecium
32
Spore-Forming Protists
Parasites, no cillia or flagella present so they can’t move on their own Have complicated life cycles Malaria caused by Plasmodia vivax
34
Reproduction of Protists
Asexual – one parent Fission- dividing of parent into 2 organisms Euglena and Amoeba Sexual – 2 parents Conjugation – swap DNA and then divide Paramecium
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.