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Question
It lives underwater for up to three years as nymph before emerging as flying insect. Fossils of this insect dating back about 300 million years have been found. This insect is
It lives underwater for up to three years as nymph before emerging as flying insect. Fossils of this insect dating back about 300 million years have been found. This insect is
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Solution
The correct option is B Stone fly
The stoneflies are around 3500 species in the world. They are believed to be one of the most primitive groups of Neoptera, with close relatives identified from Carboniferous and Lower Permian geological periods.
The nymphs of stoneflies are aquatic and live in benthic zone of well-oxygenated lakes and streams. A nymph resemble wingless adults, but often have external gills. These insects remain in this nymphal form for 1-4 years, depending on the species, and undergo 12-33 molts before emerging and becoming terrestrial as adults.
Thus, the correct answer is option B.
The stoneflies are around 3500 species in the world. They are believed to be one of the most primitive groups of Neoptera, with close relatives identified from Carboniferous and Lower Permian geological periods.
The nymphs of stoneflies are aquatic and live in benthic zone of well-oxygenated lakes and streams. A nymph resemble wingless adults, but often have external gills. These insects remain in this nymphal form for 1-4 years, depending on the species, and undergo 12-33 molts before emerging and becoming terrestrial as adults.
Thus, the correct answer is option B.
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