托福考试

【分析解答题】Question: Summarize the lecture and explain how specific chemicals released by animals help them identify location and attract mates.
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试题答案： 答案解析：A pheromone is a form of chemical communication used by certain animals, and it serves two purposes: marking location and attracting mates. For example, insects such as bees release chemical substances as scent markers to indicate paths from their home to food and other important locations. Also, chemical signals are released by certain animals to indicate their readiness to mate. For example, the female moth releases a kind of chemical with a scent that attracts male moths and signals her availability to mate. [听力原文] W: A pheromone is a specific chemical released by animals to communicate and initiate response among the members of same species. It plays a very important role in the lives of many species because animals use their scent to mark location and attract mates. Chemical substances released by individual bees into the hive or environment are a good example to show how the pheromone, namely the smell, can help identify location. Each time when honeybees search for food, those who stay in the hive mark the hive locations by scent. Therefore, the bees searching for food outside can follow the signal and find their way home. The powerful marker pheromones help bees mark location. Also, chemical communication among species can help attract mates. It is well-known that many female insects such as moths lure mates by releasing a form of perfume. They do it by opening a scent gland, allowing the sex attractant pheromone to evaporate into the air. Male moths are drawn by the scent that serves as a signal that shows the female moths are ready to mate. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>