托福TPO33口语task4题目 Reading Part:
Carrying Capacity
An animal species needs to have enough resources, like food and water, to survive in any given environment. However, because resources are limited, only a certain number of animals of a particular species are able to survive in a given habitat. The greatest number a habitat can support is known as the carrying capacity. If nothing happens to disrupt or unbalance the relationship between the animal and its habitat, the carrying capacity will remain stable. However, a carrying capacity is not fixed. If there is a significant disruption, such as an environmental event that alters the amount of available resources in the habitat, the carrying capacity will change.
托福TPO33口语task4题目 Listening Part:
Now listen to part of a lecture in a biology class.
(male professor) OK, so let's talk about what happened to a certain type of insect, a moth, a red-and-black moth that lives in Europe. These moths eat a plant called Ragwort and they live in fields where the Ragwort plants grow. Now, there was a group of moth that lives in one of these fields and, for many years, there was a lot of Ragwort growing there. So the moth had plenty to eat and the total number of moth in the field stayed pretty much the same.
But then one year it rained a lot less than usual and the Ragwort didn't grow as well. The result was that the moth didn't get enough to eat and many didn't survive but even the ones that did survive didn't lay as many eggs as before. So that year the moth population in the field was quite a bit smaller. The next year, though, the amount of rainfall returned to normal and again many more Ragwort plants grew and, once again, there was a lot available for the moth to eat. So that year the moth population increased and the female moth laid many more eggs than the year before. And now, after all that rainfall and plant growth, there were just as many moth in the Ragwort field as there were before.
托福TPO33口语task4题目 Question:
Explain the concept of carrying capacity using the example of the moth and Ragwort.
托福TPO33口语task4题目答案解析:
题目分析：
阅读：
Carrying Capacity
Greatest number of animals a habitat can support
The number might change if there' s a significant disruption.
听力：
Moths eat Ragwort
Live in place where there is a lot of Ragwort Total number stays the same Less rain
Ragwort didn' t grow well Moths didn' t survive Didn' t lay as many eggs Number decreased Next year situation returned Ragwort grew better Lay more eggs More moths
托福TPO33口语task4题目范文:
Carrying Capacity is the greatest number of animals a habitat can support. This number usually remains stable, but it might change when there’ s significant disruption.
Just like the example of moths. Moths eat a kind of plant called Ragwort. The moths live in a place where there is a lot of Ragwort, and the total number of moths that live there generally stays the same over the years. However, one year, it rained less, and Ragwort didn’ t grow well. So many moths didn’ t survive because there wasn’ t enough to eat. Also, female moths didn’ t lay as many eggs. Therefore, the population of moths decreased. The situation returned the next year, and Ragwort grew a lot better. As a result, the number of moths increased, and female moths laid more eggs.
Now there are as many moths as there was before.
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