Name: 
 

Ch 20 - Protista Section 3-5


Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
Which of the following series of groups contains only funguslike protists?
a.
cellular slime molds, acellular slime molds, animal-like protists
b.
cellular slime molds, fungi, water molds
c.
cellular slime molds, brown algae, water molds
d.
cellular slime molds, acellular slime molds, water molds
 

 2. 
When the amoeba-like cells of acellular slime molds fuse, they form structures with many nuclei called
a.
spores.
c.
filaments.
b.
zoosporangia.
d.
plasmodia.
 

 3. 
Some products derived from algae include
a.
thickeners for food.
b.
drugs for stomach ulcers and high blood pressure.
c.
chemicals in plastics, waxes, paints, and lubricants.
d.
all of the above
 

 4. 
What do the members of the phylum Pyrrophyta have in common with many of the members of the phylum Chrysophyta?
a.
They can be both photosynthetic and heterotrophic.
b.
They have pellicles.
c.
They have cell walls of cellulose.
d.
They have cell walls of silica.
 

 5. 
Giant kelp, the largest known species of algae, is a type of
a.
diatom.
c.
red alage.
b.
brown algae.
d.
green algae.
 

 6. 
The green alga Chlamydomonas reproduces asexually by producing
a.
sporophytes.
c.
zygotes.
b.
gametophytes.
d.
zoospores.
 

 7. 
Many algae switch back and forth between diploid and haploid stages during their life cycle in a process known as
a.
sexual reproduction.
c.
alternation of generations.
b.
asexual reproduction.
d.
fusion of opposite mating types.
 

 8. 
A bloom is
a.
a symbiotic relationship between algae and coral.
b.
an enormous mass of algae.
c.
the clouding of water by sewage.
d.
none of the above
 

 9. 
Chlorophyll a is best at absorbing
a.
blue light.
c.
yellow and green light.
b.
red and violet light.
d.
green light.
 

 10. 
Funguslike protists get nutrients by
a.
living as an animal parasite.
b.
photosynthesis.
c.
absorbing them from dead or decaying matter.
d.
none of the above
 

 11. 
What kinds of weather conditions might cause a farmer to worry about infection by Phytophthora infestans?
a.
warm and dry
c.
cool and wet
b.
cool and dry
d.
warm and wet
 

 12. 
A mildewed grape crop might be caused by a(an)
a.
acellular slime mold.
c.
cellular slime mold.
b.
water mold.
d.
none of the above
 

 13. 
Which organism would most likely be present in a water sample collected during a red tide?
a.
diatoms
c.
Tridacna
b.
Euglenophyta
d.
Gonyaulax
 

 14. 
The funguslike protists that thrive on dead or decaying organic matter in water, some of which are plant parasites on land, are
a.
acellular slime molds.
c.
true fungi.
b.
water molds.
d.
cellular slime molds.
 

 15. 
Members of the phylum Chrysophyta contain chloroplasts of what color?
a.
silver
c.
green
b.
gold
d.
red
 

 16. 
An argument that does NOT support the classification of multicellular green algae as plants is that multicellular green algae
a.
display alternation of generations.
b.
have highly specialized tissues.
c.
live primarily in water.
d.
contain chlorophyll a, which makes them green.
 

 17. 
Approximately what percent of all the photosynthesis on Earth is carried out by algae?
a.
100%
c.
50%
b.
0%
d.
25%
 

 18. 
Phytoplankton are only found at the surface of ocean waters because
a.
they feed on tiny organisms living at the surface.
b.
they require sunlight to carry out photosynthesis.
c.
they cannot withstand the colder temperatures of deep water.
d.
they are an important food source to surface-dwelling marine organisms.
 

 19. 
The work of funguslike protists and other decomposers is important in improving the quality of
a.
potato crops.
c.
salt water.
b.
topsoil.
d.
fresh water.
 

 20. 
Which characteristic distinguishes funguslike protists from fungi?
a.
Fungi have centrioles.
c.
Fungi have cell walls made of chitin.
b.
Funguslike protists grow in damp places.
d.
Funguslike protists absorb food through their cell membranes.
 

 21. 
In the life cycle of the green alga Ulva, one of the phases produces male and female gametes known as
a.
spores.
c.
zoospores.
b.
gametophytes.
d.
sporophytes.
 

 22. 
What characteristic of plants is shared by green algae?
a.
photosynthetic pigments
c.
cell wall composition
b.
multicellularity
d.
all of the above
 

 23. 
Why are algae considered one of the most important groups of organisms on our planet?
a.
They produce chemicals that are used to make plastics, waxes, and paints.
b.
They produce much of Earth’s oxygen through photosynthesis.
c.
They produce chemicals that are used to treat health problems.
d.
They are rich in vitamin C.
 

 24. 
Which substances allow algae to harvest and use the energy from sunlight?
a.
chlorophyll and accessory pigments
c.
oogonium and antheridium
b.
phycobilin and flagellum
d.
cilium and fucoxanthin
 

 25. 
Which of the statements is true about dinoflagellates?
a.
Many species are luminescent.
b.
They contain bright yellow pigments.
c.
They possess pillbox-shaped cell walls of silica.
d.
They can be both photosynthetic and heterotrophic.
 

 26. 
What important role do funguslike protists play in an ecosystem?
a.
blight
c.
decomposer
b.
photosynthesizer
d.
pathogen
 

 27. 
Which of the following structures would NOT be found in a Euglenophyte?
a.
eyespot
b.
cell wall
c.
flagellum
d.
pellicle
 

 28. 
What effect does a red tide have on humans?
a.
Eating poisoned shellfish from affected waters can cause sickness and death to humans.
b.
The protists help clean up wastes discharged by local sewage pipes.
c.
It is unhealthy to swim in the ocean during a red tide.
d.
All the fish in the area die, causing local fishermen to lose money.
 

 29. 
Red algae lack flagella and
a.
centrioles.
c.
chlorophyll.
b.
nuclei.
d.
accessory pigments.
 

 30. 
What effect did the evolution of different forms of chlorophyll in algae have?
a.
no effect on the range of depths at which algae can live
b.
a reduction in the photosynthetic capacity of algae
c.
an increase in the range of depths at which algae can live
d.
a decrease in the range of depths at which algae can live
 

 31. 
In oomycetes, sexual reproduction takes place in the
a.
zoosporangium.
c.
sporangium.
b.
migrating colony.
d.
antheridium and oogonium.
 

Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.
 

 32. 
Unlike many others in the same phylum, the spores of the Myxomycota that caused potato blight in nineteenth-century Ireland are airborne. _________________________

 

 33. 
There are four types of chlorophyll, which are able to absorb different wavelengths of light. _________________________

 

 34. 
Blooms of dinoflagellates can cause red tides. _________________________

 

 35. 
Unlike fungi, water molds produce flagellated spores. _________________________

 

 36. 
Ciliates use flagella for feeding and movement. _________________________

 

 37. 
Funguslike protists are autotrophs. _________________________

 

 38. 
Slime molds are funguslike protists that play key roles in recycling organic matter. _________________________

 

 39. 
Dried Porphyran, called nori in Japanese, is a green alga. _________________________

 

 40. 
Protists are a diverse group of mainly multicellular eukaryotes. _________________________

 

 41. 
The holdfast of a brown alga helps keep it upright in the water. _________________________

 

 42. 
A high level of certain toxins found in filter feeders, such as clams, may be a sign that an algal bloom has occurred. _________________________

 

 43. 
If the people in a town contracted amebic dysentery or infections by the animallike protist, Giardia, the most likely cause would be contaminated drinking water. _________________________

 

 44. 
The cell walls of diatoms are rich in cellulose. _________________________

 

 45. 
Chlamydomonas produces male and female gametes. _________________________

 

 46. 
Members of the phylum Rhodophyta contain the accessory pigment phycobilin. _________________________

 

Completion
Complete each statement.
 

 47. 
Because algae undergo ________________________, they produce much of Earth’s atmospheric oxygen.
 

 

 48. 
A fish-eating bear indirectly relies on _________________________ protists for food.
 

 

 49. 
____________________ protists are heterotrophs that absorb nutrients from dead or decaying organic matter.
 

 

 50. 
Close examination of a colony of individuals of the phylum Acrasiomycota would reveal that they retain their ____________________, unlike organisms of the phylum Myxomycota.
 

 

 51. 
In Ulva, the haploid reproductive cells are called spores; these are analogous to the ____________________ of Chlamydomonas.
 

 

Short Answer
 

 52. 
What is the function of chlorophyll and accessory pigments in algae?
 

 53. 
To what features in plants are the holdfast, stipes, and blades of a brown algae similar? How does a brown algae remain upright in the water?
 

 54. 
List one way that water molds can be helpful to people and one way they can be harmful.
 

 55. 
What is the primary difference between cellular slime molds and acellular slime molds?
 

 56. 
What is the advantage to algae of having forms of chlorophyll other than chlorophyll a?
 



 
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