Prelims 2024

Q. Consider the following:
1. Butterflies
2. Fish
3. Frogs

How many of the above have poisonous species among them?

(a) Only one
(b) Only two
(c) All three
(d) None
Correct answer: (c) All three

Question from UPSC Prelims 2024 GS Paper

Explanation:

Poisonous Species

1. Butterflies: While most butterflies are harmless, there are indeed poisonous species. Many butterflies in the genus Heliconius, for example, are toxic due to cyanogenic glycosides they acquire from their food plants as caterpillars.

2. Fish: There are numerous poisonous fish species. Examples include pufferfish (which contain tetrodotoxin), lionfish, and stonefish. Some fish are poisonous to eat, while others have venomous spines.

3. Frogs: Many frog species are poisonous, particularly those in the family Dendrobatidae, commonly known as poison dart frogs. These frogs secrete toxic substances through their skin as a defense mechanism.

Therefore, the correct answer is: (c) All three

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