Introduction to Parasitology

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What is the definition of a parasite?

An organism that lives within the body of the host
An organism that infects and obtains nourishment from another living being (correct)
An organism that cannot survive without a host
A small, multicellular organism

Which of the following is an example of an ectoparasite?

Pathogenic free-living amoeba
Toxoplasma gondii
Head louse (correct)
Hydatid disease

What is the difference between an obligate parasite and a facultative parasite?

Obligate parasites can live both as parasites and in a free-living state, while facultative parasites cannot. (correct)
Facultative parasites only infect humans accidentally, while obligate parasites do so intentionally.
Facultative parasites cannot exist without a host, whereas obligate parasites can.
Obligate parasites depend on the host for survival, while facultative parasites can choose to live freely.

What type of parasite is Toxocara canis?

Aberrant parasite (D) Signup and view all the answers

In which category do protozoa and helminths fall under?

Endoparasites (C) Signup and view all the answers

How does an aberrant parasite differ from an accidental parasite?

Aberrant parasites cannot be transmitted from human to human, while accidental parasites can. (C) Signup and view all the answers

What is the role of a definitive host in the life cycle of a parasite?

It harbors the adult parasite or the parasite replicates sexually (D) Signup and view all the answers

Which of the following is NOT considered a potential source of infection for parasitic diseases?

Sterile medical equipment (D) Signup and view all the answers

What is the role of a paratenic host in the life cycle of a parasite?

It harbors the larval form of the parasite, but the parasite does not develop further (C) Signup and view all the answers

Which of the following modes of infection is NOT mentioned in the given text?

Injection (A) Signup and view all the answers

What is meant by a 'simple' life cycle in the context of parasites?

The life cycle is completed in a single host (C) Signup and view all the answers

Which of the following is a potential complication associated with parasitic infections?

Inflammation of tissues and blood vessels (C) Signup and view all the answers

Which of the following statements about immunity in parasitic infections is true?

Acquired immunity involves both antibody-mediated and cell-mediated responses. (C) Signup and view all the answers

What is the purpose of demonstrating parasites in various clinical specimens?

To diagnose the parasitic infection in the patient. (C) Signup and view all the answers

Which of the following is NOT a method mentioned for demonstrating parasites?

Immunohistochemistry (B) Signup and view all the answers

What is the primary characteristic used to classify parasites into three main groups?

Body structure (B) Signup and view all the answers

Which of the following parasites belongs to the phylum Protozoa?

Plasmodium (C) Signup and view all the answers

What is the term used to describe the resistance offered by the host towards injury caused by a parasite?

Immunity (B) Signup and view all the answers