21. F 【解析】根据空后“Leaves of evergreen trees stay green all year."可推知空处内容与树叶保 持绿色有关。 分析备选项可知,F项“南方的一 些(阔叶)树在冬天仍保持绿色。 ”符合语境。 故选F。 22. Sunlight, CO, and water. 【解析】细节理解题。 题干意为:树叶将什么变成糖?根据第二段中 ...
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Grubb PJ, Thompson CL, Harper GH (2014) Why do some evergreen species keep their leaves for a second winter, while others lose them? Forests 5:2594-2612Grubb PJ, Thompson CL, Harper GH. 2014. Why do some evergreen species keep their leaves for a second winter while others lose them?
How long do conifers keep their needles? Needles on an evergreen tree can live from one year to several years, so most trees lose their old needles every couple of years to every five years or more. Larch with yellowing needles in fall But certain species, like the larch (genusLarix, w...
Thus, the adaptive significance of increased resistance to cavitation as a mechanism of drought tolerance may be of primary importance in evergreen ... H Maherali,WT Pockman,RB Jackson - 《Ecology》 被引量: 1672发表: 2004年 Mid‐Holocene and glacial‐maximum vegetation geography of the northern...
To avoid competing with evergreen conifers, which flower in the fall or winter B. So that the leaves of the trees receiving the pollen will not prevent the pollen from reaching the trees’ stigmas C. Because they do not have enough energy to produce new leaves and pollen at the same ti...
Why do deciduous trees lose their leaves? Deciduous Trees: Two overarching and very common categories of trees are deciduous and evergreen trees. Evergreen trees, as the name implies, are green year-round because they keep their needles. A defining feature of deciduous trees, on the other hand...
evergreen trees (usually the pine or fir variety) are often used to decorate homes at Christmas. The evergreen tree is a symbol of perpetual life because they retain their leaves throughout the seasons, rather than shedding. Like the trees,evergreen contentis considered sustainable and lasting....
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