Listen to part of a lecture in a biology class.
听力材料
Listen to part of a lecture in a biology class.
Let's look at another form of planned behavior shedding. Some plants shed, drop some of their parts. The parts that plants commonly drop are leaves, flowers, seeds, and fruits. And for many plant species, this behaviour shedding benefits them in several ways. Let's look at some good effects that shedding has for plants. First, shedding can prevent damage to plants. Take the maple tree, for example, it grows in climates where it's cold and snow falls during part of the year. At the approach of the cold season, the maple tree begins to shed its leaves, begin to fall to the ground. How does this prevent damage to the maple tree? If the leaves remained on the tree, snow would fall on them and turn into ice. And the snow and ice would continue to build up throughout the season. Under the weight of all the snow and ice, the branches would begin to break and cause damage to the tree. By shedding its leaves, the tree avoids this kind of damage. Now, other plants benefit in a different way from shedding their parts. They are able to conserve nutrients. The avocado tree is a good example of a plant that benefits in its way from shedding. The avocado usually produces large numbers of young fruit, and the young fruit needs lots of nutrients to grow and develop into mature fruit. But since the avocado tree produces much more fruit than it can nourish to maturity, what it does is to shed some of its fruit, allowing some of it to fall to the ground. The tree no longer has to nourish the fallen fruit, and it can save enough nutrients to let the remaining fruit develop into maturity
问题
Using the examples of the maple tree and the avocado tree, describe two ways in which shedding benefits plants.
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分数最高最新
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基础版本（100词）
Shedding benefits plants in two main ways. First, it prevents damage. For example, the maple tree sheds its leaves before winter. If the leaves stayed, snow would pile up and turn into ice, causing branches to break under the weight. By shedding, the tree avoids this damage. Second, shedding helps conserve nutrients. The avocado tree produces more fruit than it can support. It sheds some of the young fruit, which stops the tree from wasting nutrients on them. This allows the tree to focus its resources on the remaining fruit, helping them grow to maturity.
高阶版本（150词积累版）
Shedding provides plants with two significant advantages. Firstly, it acts as a protective mechanism against environmental damage. Take the maple tree, for instance. In colder climates, it sheds its leaves before winter sets in. If the leaves remained, snow would accumulate and freeze on them, adding weight to the branches. Over time, this buildup could cause the branches to break, severely damaging the tree. By shedding its leaves, the maple tree effectively prevents such harm. Secondly, shedding enables plants to optimize their nutrient allocation. The avocado tree exemplifies this benefit. It often produces an excess of young fruit, more than it can sustain. By shedding some of these immature fruits, the tree ceases to expend nutrients on them. This conservation of resources allows the avocado tree to channel its energy into nurturing the remaining fruit, ensuring they develop fully and reach maturity. Thus, shedding not only safeguards plants from physical damage but also enhances their nutrient efficiency.
高阶版本（130词精简作答版）
Shedding offers plants two key benefits. First, it prevents environmental damage. For example, the maple tree sheds its leaves before winter. If leaves remained, snow would accumulate and freeze, adding weight to branches. Over time, this could cause branches to break, harming the tree. Shedding avoids this. Second, shedding helps conserve nutrients. The avocado tree illustrates this. It produces more young fruit than it can sustain. By shedding some immature fruit, the tree stops expending nutrients on them. This allows it to focus resources on the remaining fruit, ensuring they develop fully and reach maturity. Thus, shedding protects plants and optimizes nutrient use. -
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