Unlocking the Science of Mosquito Attraction
On a warm summer evening, almost everyone has heard the annoying, high-pitched buzz of a mosquito. Shortly after, one person in a group might end up covered in itchy red bites, while the person sitting next to them remains completely untouched. Female mosquitoes require the protein and iron found in blood to develop their eggs, but they do not pick their hosts at random. Instead, these insects rely on chemical, visual, and thermal cues to track down their next meal.
The main signal that guides mosquitoes from a distance is carbon dioxide. Every time humans breathe out, they release a trail of carbon dioxide that mosquitoes can detect from over one hundred feet away. People with a higher metabolic rate, as well as larger adults, naturally exhale more gas, making them easier to locate. Once a mosquito gets closer, it starts checking skin odor, which is made of hundreds of chemical compounds. Sweat releases substances like lactic acid and ammonia, which act as strong attractants. Genetics also affect skin chemistry by shaping the skin microbiome, a community of millions of tiny bacteria living on the skin. These bacteria break down sweat into specific smells that mosquitoes find hard to resist.
- carbon dioxide:
- A colorless gas produced by breathing out that mosquitoes use to track hosts from far away.
- metabolic rate:
- The speed at which a body converts food into energy, affecting how much gas and heat it releases.
- compounds:
- Chemical substances made of two or more elements joined together.
- attractants:
- Substances or signals that draw animals or insects toward a specific place or target.
- microbiome:
- The collection of microscopic organisms, such as bacteria, living in a specific environment like human skin.
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Preview questions from this passageShowHide
- 1Why do female mosquitoes need to consume blood from humans or animals?
- 2How far away can mosquitoes detect carbon dioxide exhaled by humans?
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About this informational passage for 6th Grade
“Unlocking the Science of Mosquito Attraction” is a informational reading passage about Mosquito Attraction, written for 6th Grade. It takes about 3 minutes to read (450 words) and comes with an interactive quiz and a printable worksheet with comprehension questions and an answer key.