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14.2: Types of Protists

Difficulty Level: At Grade Created by: CK-12

Lesson 14.2: True or False

Name___________________ Class______________ Date________

Write true if the statement is true or false if the statement is false.

_____ 1. Protists are often classified based on how similar they are to animals, fungi, or plants.

_____ 2. Protozoa are fungus-like protists.

_____ 3. Many protists are single-celled organisms.

_____ 4. Some protists are multicellular organisms.

_____ 5. Some protozoa eat bacteria.

_____ 6. Some protists eat algae.

_____ 7. Malaria is caused by algae that live in protozoa.

_____ 8. Sporozoan protozoa are those that move only when they are adults.

_____ 9. Diatoms are a type of protozoa.

_____ 10. Kelp are fungus-like protists.

_____ 11. Kelp are multicellular organisms that live in the ocean.

_____ 12. All algae have roots, stems, and leaves.

_____ 13. All algae reproduce only by sexual reproduction.

_____ 14. On rotting logs, one may find slime molds.

_____ 15. Fish may have parasites called water molds.

Lesson 14.2: Critical Reading

Name___________________ Class______________ Date________

Read these passages from the text and answer the questions that follow.

Reproduction of Algae

Algae have varied life cycles. Two examples are shown in the figure below. Both cycles include phases of asexual reproduction (haploid, n) and sexual reproduction (diploid, 2n). Why go to so much trouble to reproduce? Asexual reproduction is fast, but it doesn’t create new genetic variation. Sexual reproduction is more complicated and risky, but it creates new gene combinations. Each strategy may work better under different conditions. Rapid population growth is adaptive when conditions are favorable. Genetic variation helps ensure that some organisms will survive if the environment changes.

Life Cycles of Algae: Two Examples - Zygotic meiosis and Gametic meiosis. In life cycle A, diploid (2n) zygotes undergo meiosis and produce haploid (n) gametes. The gametes undergo mitosis and produce many additional copies of themselves. How is life cycle B different from life cycle A? (Image courtesy of CK-12 Foundation and under the Creative Commons license CC-BY-NC-SA 3.0.)


1. What are the two types of life cycles of algae shown in the figure?

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2. What is meiosis?

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3. In the zygotic meiosis life cycle, what is the ploidy level (n or 2n) of the individuals? Explain your reasoning.

\begin{align*} \\ \\ \\ \\ \\ \end{align*}

4. In the gametic meiosis life cycle, what is the ploidy level (n or 2n) of the individuals? Explain your reasoning.

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5. What are the advantages of asexual and sexual reproduction? What are the disadvantages of each?

\begin{align*} \\ \\ \\ \\ \\ \end{align*}

Lesson 14.2: Multiple Choice

Name___________________ Class______________ Date________

Circle the letter of the correct choice.

  1. Protozoa can get their food by
    1. eating algae.
    2. eating dead organic material.
    3. preying on other organisms and engulfing and digesting them.
    4. all of the above.
  2. Which of the following is not a class of protozoa?
    1. flagellate
    2. sporozoan
    3. bacteria
    4. amoeboid
  3. The type of protozoan that uses psuedopods (false feet) to move is
    1. a ciliate protozoan.
    2. an amoeboid protozoan.
    3. a sporozoan.
    4. an algae.
  4. Algae are considered plant-like because
    1. they have roots, stems, and leaves.
    2. they are often unicellular.
    3. they eat dead organic matter.
    4. they have chloroplasts and carry out photosynthesis.
  5. The common feature shared by dinoflagellates, euglenids, green algae, and red algae is that they
    1. all have chlorophyll.
    2. all are multicelluar organisms.
    3. never carry out photosynthesis.
    4. all of the above
  6. Fungus-like protists have
    1. cell walls made of cellulose.
    2. cell walls made of chitin.
    3. chloroplasts for photosynthesis.
    4. none of the above.
  7. Slime molds will start to swarm when
    1. the sun is out.
    2. it is a full moon.
    3. food is scarce.
    4. there is a lot of pollen in the air.
  8. Water molds are
    1. a type of fungus-like protist.
    2. a type of animal-like protist.
    3. found only in the ocean.
    4. found only in Australia.

Lesson 14.2: Vocabulary I

Name___________________ Class______________ Date________

Match the vocabulary word with the proper definition.


_____ 1. animal-like protists

_____ 2. an organism that hunts living organisms and consumes them as food

_____ 3. multicellular seaweed

_____ 4. fungus-like protist typically found on decaying organic matter such as rotting logs

_____ 5. an organism that uses flagella for motility

_____ 6. an organism that uses psuedopods for motility

_____ 7. an organism that uses cilia for motility

_____ 8. an organism that consumes plants

_____ 9. fungus-like protist typically found on surface water and moist soil

_____ 10. type of protozoa that cannot move in the adult stage

_____ 11. plant-like protists

_____ 12. an organism that gets food from dead organic matter


a. algae

b. amoeboid

c. ciliate

d. decomposers

e. flagellate

f. herbivore

g. kelp

h. predator

i. protozoa

j. slime mold

k. sporozoa

l. water mold

Lesson 14.2: Vocabulary II

Name___________________ Class______________ Date________

Fill in the blank with the appropriate term.

1. Plasmodium, the organism that causes malaria, is the ___________ type of protozoan.

2. Some members of the __________ group of protists infect plants and destroy crops such as potatoes, corn, grapes, and lettuce.

3. When food is scarce, cells of the __________ group of protists swarm together and crawl as a mass, ingesting any food they find along the way.

4. The __________ are animal-like protists.

5. The __________ protozoa use flagella to move.

6. The __________ are multicellular seaweeds that can grow as large as some trees.

7. __________ are the unicellular protists that can carry out photosynthesis.

8. __________ capture and engulf prey.

9. The __________ protozoa uses psuedopods to move.

10. __________ eat algae.

11. ___________ eat dead organic matter.

12. The __________ protozoa use cilia for motility.

Lesson 14.2: Critical Writing

Name___________________ Class______________ Date________

Thoroughly answer the question below. Use appropriate academic vocabulary and clear and complete sentences.

What are some common characteristics of all protists? What are the main distinguishing characteristics of the protozoa, algae, and fungus-like protists?

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