Communicable diseases: larvivorous fish: practice question

A PSM question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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PSM · Communicable diseases: larvivorous fish

Sample item

Which fish is widely used for biological control of mosquito larvae in malaria control?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

B. Gambusia affinis

Gambusia affinis (mosquito fish) and Poecilia reticulata (guppy) feed on mosquito larvae and are used in water collections, wells and ponds as larvivorous fish.

Option by option

  • A. Rohu

    Rohu is a food fish and not a larvivore.

  • B. Gambusia affinis (correct)

    Correct. Gambusia is a standard larvivorous fish.

  • C. Catla

    Catla is a carp used in aquaculture.

  • D. Hilsa

    Hilsa is a food fish.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this PSM question

What is the answer to this PSM question?

The best answer is B, Gambusia affinis. Gambusia affinis (mosquito fish) and Poecilia reticulata (guppy) feed on mosquito larvae and are used in water collections, wells and ponds as larvivorous fish.

Why is "Rohu" not the answer?

Rohu is a food fish and not a larvivore.

Why is "Catla" not the answer?

Catla is a carp used in aquaculture.

Why is "Hilsa" not the answer?

Hilsa is a food fish.

What concept does this question test?

It tests Communicable diseases: larvivorous fish in PSM. The correct option holds because: Correct. Gambusia is a standard larvivorous fish.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Communicable diseases: larvivorous fish?

Practise biostatistics with small calculations until sensitivity, predictive values and risk measures are automatic. Then use the flashcards and the other PSM questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.