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Protists
Directions: Fill in each blank to the left of the number with the letter of the correct protist from the
word bank below. Each answer will only be used once.
A. brown algae
B. diatoms
E. green algae
H. flagellates
C. dinoflagellates
F. other protozoans
I. sarcodines
J. red algae
D. euglenoids
G. ciliates
K. slime molds
L. water molds and downy mildews
________ 1. These live in water or in moist places. They grow as tiny threads that look like a fuzzy
covering and can attack food crops.
________ 2. These are heterotrophs that do not have a cell wall. They move with flagella.
________ 3. These can be heterotrophs or autotrophs. They use flagella to move and contain green
pigments. They are a unicellular algae found mostly in fresh water.
________ 4. These are almost all are multicellular. Their pigment is good at absorbing the small
amount of light deep in ocean waters. They are a type of seaweed.
________ 5. These are unicellular organisms with glasslike cell walls. They are added to toothpaste
and scouring products.
________ 6. These organisms have a contractile vacuole. They move and feed by using pseudopods.
The ameba is an example.
________ 7. These move by forming pseudopods. They feed on bacteria and decaying organisms.
They are often beautifully colored.
________ 8. These have hairlike projections that help them move, feed, and sense the environment.
A paramecium is an example.
________ 9. Most of these live in salt water. They have two flagella and can cause red tides.
________ 10. This is a multicellular seaweed. The Giant Kelp belongs to this group.
________ 11. These are ALL parasites. One type can cause malaria.
________ 12. These can be multicellular or unicellular. They contain green pigments and can cause
eutrophication.