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why do insects are attracted by light?

why do insects are attracted by light?

Grade:12th pass

2 Answers

Badiuddin askIITians.ismu Expert
147 Points
11 years ago

Dear amarnath

There is no single scientific explanation for this behavior,

 however a  popular theory is that insects attracted to light use it as a navigational aid. An insect flying north, for example, could judge its direction by keeping a natural source of light such as the sun or moon on its right side. This method works well as long as the source of light remains constant and at a distance. If an insect encounters a round incandescent porch light, however, it becomes confused by the light source. A moth will continue to circle a light because it instinctively wants to keep the light on a certain side of its body while navigating

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Badiuddin

Askiitians Expert Himanshu Geed - IIT Delhi
31 Points
11 years ago



Dear Amarnath,

To understand this phenomenon, you need to know about phototaxis. Phototaxis is an organism's automatic movement toward or away from light. Cockroaches are an example of a negatively phototactic organism. You've probably noticed how they scurry back into dark corners and crevices when you illuminate their late-night snacking party in your kitchen.


Insects  attracted to light use it as a navigational aid. An insect flying north, for example, could judge its direction by keeping a natural source of light  such as the sun or moon on its right side. This method works well as long as the source of light  remains constant and at a distance. If an insect encounters a round incandescent porch light, however, it becomes confused by the light  source. A moth  will continue to circle a light  because it instinctively wants to keep the light  on a certain side of its body while navigating.


Please feel free to post as many doubts on our discussion forum as you can. If you find any question
Difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We
are all IITians and here to help you in your IIT JEE preparation.



All the best  !!!




Regards,

Askiitians Experts

Himanshu Geed

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