Question 1

Which characteristic is shared by all protozoa?

Accepted Answer

They are eukaryotic and single-celled.

Question 2

Protozoa are traditionally classified into four groups based on which feature?

Accepted Answer

Their method of motility

Question 3

Which group of protozoa moves using flagella, and what is a unique feature of their movement?

Accepted Answer

Mastigophora; flagella in the 'front' pulls the cell

Question 4

Trichomonas vaginalis is an example of a protozoan with which specialized structure for movement?

Accepted Answer

Undulating membrane enclosing a flagellum

Question 5

Which equation best represents the process of asexual reproduction by mitosis in protozoa?

Accepted Answer

$n \rightarrow n + n$

Question 6

A student observes a protozoan moving with many short, hair-like structures in a coordinated fashion. Which group does this organism most likely belong to?

Accepted Answer

Ciliophora

Question 7

Which statement about Apicomplexa is correct?

Accepted Answer

They are non-motile, usually intracellular parasites.

Question 8

What is the function of a cyst in the life cycle of protozoa?

Accepted Answer

It allows the organism to survive harsh conditions by becoming dormant.

Question 9

During conjugation in Ciliophora, what occurs?

Accepted Answer

Reciprocal exchange of genetic material without gametes.

Question 10

Which process is described by the equation $n + n \rightarrow 2n$ in the context of protozoan reproduction?

Accepted Answer

Sexual reproduction by gamete fusion

Question 11

Giardia is transmitted primarily by which route?

Accepted Answer

Ingestion of cysts from contaminated water, food, or hands

Question 12

Which stage of the protozoan life cycle is responsible for active feeding and growth?

Accepted Answer

Trophozoite

Question 13

A patient is diagnosed with malaria. In which host does sexual reproduction of Plasmodium occur?

Accepted Answer

Mosquito

Question 14

Which of the following best describes the movement of Amoebozoa?

Accepted Answer

Movement by cytoskeletal changes forming pseudopods

Question 15

Which protozoan group is most likely to reproduce asexually by schizogony?

Accepted Answer

Apicomplexa

Question 16

A water sample contains protozoa with adhesive disks that attach to the intestinal mucosa. Which organism is most likely present?

Accepted Answer

Giardia

Question 17

Which of the following is NOT a typical method of protozoan transmission?

Accepted Answer

Direct absorption through skin

Question 18

Which life cycle stage is most likely to survive outside the host and facilitate transmission?

Accepted Answer

Cyst

Question 19

Which of the following statements about protozoan sexual reproduction is correct?

Accepted Answer

Ciliophora exchange genetic material by conjugation without gametes.

Question 20

A researcher observes a protozoan with 8 flagella located at the anterior end. Which group does this organism most likely belong to?

Accepted Answer

Mastigophora

Protozoa: Classification, Structure, and Life Cycles

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