Mosquito: Getting to know the enemy  

Oleh:

[s.n]

Jenis: Article from Bulletin/Magazine
Dalam koleksi: English Teaching Forum (http://exchanges.state.gov/englishteaching/forum/archives.html) vol. 38 no. 2 (Apr. 2000), page 1-3.
Topik: Mosquito; Insects
Fulltext: Mosquito Getting to know the enemy.pdf (275.03KB)

Isi artikel

Nearly two million species of insects grouped, into about 30 orders, live in many different habitats throughout the world. They are very important because they pollinate flowers and are food for birds and other animals. However, many insects are pests that feed on crops or spread diseases. One such insect is the mosquito. There are about 3,000 species of mosquitos, which are distinguished by their antennae of 14 or 15 segments and by the presence of scales on the veins of their wings. The larvae are called wigglers and are aquatic, feeding on plants, algae, and microscopic animal life. Some mosquitos feed on the juices of plants, and some do not feed at all in their adult stage. Only female mosquitos suck the blood of humans and other warm-blooded animals, because they need blood to develop each batch of fertile eggs. But like the male mosquito, females feed only on nectar for their food source. The female mosquito locates her human targets by following the carbon dioxide that we exhale. When the mosquito bites a human, she injects saliva into our skin before drawing blood. This saliva helps her to penetrate the skin and prevents blood clots from developing in her food canal. The welts and itching that we experience after being bitten are an allergic reaction to the saliva.

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