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
51
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] Which of the following is an example of symbiosis as it is described in Paragraph 2 ?
选项
A、Certain types of tall grass conceal tigers because of the tigers’ striped markings.
B、Fish called remoras attach themselves to sharks and eat the scraps of the sharks’ meals.
C、Mistletoe, a type of shrub, grows on trees and harms them by extracting water and nutrients.
D、Protozoa in the intestines of termites digest the cellulose that the termites eat, and their waste products nourish the termites.
答案
D
解析
细节题型见第二段第四句The two organisms live together to the benefit of both,a relationship known as symbiosis.(这两种有机体为了双方的利益共同生存,它们间的关系被称之为“共生现象”)及随后的举例;而本题的四个选项中只有选项D(白蚁肠中的原生动物将白蚁吃下的纤维素消化,而它们的排泄物又为白蚁提供滋养)体现了这种共生现象,因此 D为答案。此外还可根据四个选项中的动词来判断是否有互利互存的关系来寻找答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3311122.html
相关试题推荐
Whatdoesthestatementimply?[originaltext]Walkingthroughthisrainforestin
WheninAustraliarecently,Ivisitedaeucalyptusforestthatwasoncethe
林边有个洞,叫白龙洞。传说《白蛇传》中的白娘子曾经在这里修炼。NeartheforestistheWhiteDragonCavewhichis
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
Lichensmaygrowonthebarkofatreeinasteamingtropicalrainforest,o
Lichensmaygrowonthebarkofatreeinasteamingtropicalrainforest,o
Lichensmaygrowonthebarkofatreeinasteamingtropicalrainforest,o
Lichensmaygrowonthebarkofatreeinasteamingtropicalrainforest,o
Lichensmaygrowonthebarkofatreeinasteamingtropicalrainforest,o
Lichensmaygrowonthebarkofatreeinasteamingtropicalrainforest,o
随机试题
InatotalofsixstatesinthemiddleofAmerica,15,000assembly-linework
IfirstmetBilliewhenIcametoNewYorkat19.Ididn’tknowwhatIwasg
Nomatterwhoyouareorwhereyoucomefrom,onethingiscertain:youarea
WhichofthefollowingisNOTthesymptomofthewoman?[originaltext]M:Hello,
造纸术是中国的四大发明之一,是中华民族对世界文明的杰出贡献。AsoneoftheChineseFourGreatInventions,paper
A.反絮凝剂B.乳化剂(注射用)C.润湿剂D.助悬剂E.絮凝剂枸橼酸盐(使ξ电位
与2005年相比,2006招商银行的净利润约增长了:A.81.37% B
在个人住房贷款中,个人住房贷款的合同有效性风险包括()。 A.未签订合同
电杆用途和受力的说法,正确的有()。A.耐张杆用于线路转角处 B.转角杆能承
根据《合同法》规定,具有撤销权的当事人自知道或者应当知道撤销事由之日起()年内没
最新回复
(
0
)