Q: Which of the following equations best represents the process of conjugation in ciliates?

$$2 \text{Gametocytes} \rightarrow \text{Zygote (diploid)}$$

Q: Which of the following equations best represents the encystment process in protozoa?

$$\text{Trophozoite} \rightarrow \text{Cyst}$$

Question 1

Which of the following statements best describes the relationship in parasitism?

Accepted Answer

One organism benefits at the expense of the other.

Question 2

Which protozoan group is characterized by the absence of mitochondria, presence of two equal-sized nuclei, and is responsible for 'beaver fever'?

Accepted Answer

Diplomonadida

Question 3

A patient presents with persistent diarrhea after drinking water from a mountain stream. Microscopy reveals flagellated, binucleate organisms. Which parasite is most likely responsible?

Accepted Answer

Giardia lamblia

Question 4

Which of the following best describes the life cycle of a typical fecal-oral protozoan parasite?

Accepted Answer

Cysts are passed in feces and are resistant and infective; trophozoites are active and replicate in the host.

Question 5

Which of the following is a distinguishing feature of Parabasala, such as Trichomonas vaginalis?

Accepted Answer

Multiple flagella and hydrogenosomes

Question 6

Trypanosoma brucei, the causative agent of African sleeping sickness, is transmitted to humans by which vector?

Accepted Answer

Tse-tse fly

Question 7

Which of the following equations best represents the process of conjugation in ciliates?

Accepted Answer

$$2 	ext{Gametocytes} ightarrow 	ext{Zygote (diploid)}$$

Question 8

Which of the following is TRUE regarding the nutrition of most protozoa?

Accepted Answer

They are chemoheterotrophic, feeding on decaying matter, bacteria, or host tissues.

Question 9

A patient with HIV presents with severe diarrhea. Which apicomplexan parasite is most commonly isolated in such cases?

Accepted Answer

Cryptosporidium parvum

Question 10

Which of the following statements about metazoan parasites is correct?

Accepted Answer

Trematodes are also known as flukes and often have complex life cycles involving multiple hosts.

Question 11

Which structure is used by cestodes (tapeworms) to attach to the host's intestinal wall?

Accepted Answer

Scolex

Question 12

Which of the following best describes the reproductive strategy of a diecious metazoan parasite?

Accepted Answer

Male and female reproductive organs are found in separate individuals.

Question 13

A patient is diagnosed with Taenia solium infection. Which of the following is the most likely source of infection?

Accepted Answer

Eating undercooked pork

Question 14

Which of the following exoparasites is correctly matched with its class?

Accepted Answer

Tick – Arachnida

Question 15

Which of the following is a unique feature of Diplomonadida, such as Giardia lamblia?

Accepted Answer

Lack of Golgi bodies and peroxisomes

Question 16

Which of the following best explains why Trichomonas vaginalis is primarily transmitted through sexual contact?

Accepted Answer

It does not form cysts and requires direct transfer between moist environments.

Question 17

Which of the following equations best represents the encystment process in protozoa?

Accepted Answer

$$	ext{Trophozoite} ightarrow 	ext{Cyst}$$

Question 18

Which of the following is a distinguishing feature of nematodes compared to other metazoan parasites?

Accepted Answer

They are roundworms with a complete digestive tract.

Question 19

Which of the following best describes the role of exoparasites in disease transmission?

Accepted Answer

They act as vectors, transmitting pathogens between hosts.

Question 20

A marine biologist discovers a protozoan with chloroplasts and two flagella. Which group does this organism most likely belong to?

Accepted Answer

Euglenozoa

Eukaryotic Parasites: Protozoa, Helminths, and Exoparasites

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