首页
登录
职称英语
Lichens may grow on the bark of a tree in a steaming tropical rain forest, o
Lichens may grow on the bark of a tree in a steaming tropical rain forest, o
游客
2023-12-27
53
管理
问题
Lichens may grow on the bark of a tree in a steaming tropical rain forest, on the bricks of big city buildings, on rocks in hot springs, on wind-swept mountaintops, and in the driest desserts. In the arctic, they provide the principal food for caribou, and they are one of the few plants that grow in Antarctica. They are pioneers, appearing in barren rocky areas and starting the formation of soil in which mosses, then ferns, and then other plants can take root.
Lichens are a partnership of two plants — fungi and algae. The lichen body is made up of a network of fungal strands. In the upper layers of these grow groups of algae. The two organisms live together to the benefit of both, a relationship known as symbiosis. The fungi provide support, absorb water, and shelter the tender algae from direct sunlight. The algae carry on photosynthesis and provide the fungi with food. The algae can live independently and are recognizable as a species that grows alone. The fungi, on the other hand, cannot live apart from their partners. They can be placed in known classes of fungi but are unlike any species that lives independently.
So definite are the form, color, and characteristics of these double organisms that for hundreds of years, they were classified as one. More than 15,000 "species" were named. If these organisms are classified as separate species, it is difficult to fit them into the existing system of classification. But if they are classified separately, these species of fungi seem rather strange. Lichens are a splendid example of the difficulties faced by taxonomists in classifying species. [br] Why does the author say that "these species of fungi seem rather strange"?
选项
A、They are larger than typical fungi.
B、Unlike other fungi, they can produce their own food.
C、They exist only as partners of algae.
D、They do not fit into any known class of fungi.
答案
C
解析
细节题型见第二段倒数第二句、第三句:(The algae能独立生存且是公认的能独自生长的物种;而另一方面,The fungi没有同伴却无法生存)及第三段第三句:但是如果将它们分别地分类,这些fungi物种就显得格外奇怪了(因为它们是依赖同伴生存的);因此C为答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3311125.html
相关试题推荐
WheninAustraliarecently,Ivisitedaeucalyptusforestthatwasoncethe
如有必要,调查组将给予现场办公更好的保护,林业部野生动物及森林保护司副司长说。VicedirectoroftheMinistryofForestry
EarlyMaoriadaptedthetropicallybasedeastPolynesiancultureinlinewith
Lichensmaygrowonthebarkofatreeinasteamingtropicalrainforest,o
Lichensmaygrowonthebarkofatreeinasteamingtropicalrainforest,o
Lichensmaygrowonthebarkofatreeinasteamingtropicalrainforest,o
Lichensmaygrowonthebarkofatreeinasteamingtropicalrainforest,o
Lichensmaygrowonthebarkofatreeinasteamingtropicalrainforest,o
Lichensmaygrowonthebarkofatreeinasteamingtropicalrainforest,o
Lichensmaygrowonthebarkofatreeinasteamingtropicalrainforest,o
随机试题
[A]park[B]music[C]library[D]taxi[E]worker[F]subject
TheAleuts(阿留申人)werenamedsobyRussians,buttheycallthemselvesUnangan
[originaltext]Thankyouforcoming,everyone.Today’spresentationwillsho
金融衍生品是一种金融合约,其价值取决于一种或多种基础资产或指数,合约的基本种类包
关于两种资产收益率的协方差和相关系数。下列说法正确有()。A.相关系数为正
地高辛与氢氯噻嗪合用治疗充血性心力衰竭,为预防强心甙中毒,应警惕的是( )。A
以下能够反映变现能力的财务指标是()。A:资本化比率 B:固定资产净值率
马钱子中最主要的有效成分是()。 A.番木鳖碱 B.番木鳖次碱 C.伪番木
寄生人体的多数雌性线虫均具有结构相同的几套生殖管道A.2套B.5套C.4套D.1
下列行为中,构成挪用公款罪的有: A.某国有公司经理将本单位公款10万元借给亲
最新回复
(
0
)