首页
登录
职称英语
Unlike other primroses, self-pollinating primroses do not need to rely on insect
Unlike other primroses, self-pollinating primroses do not need to rely on insect
游客
2025-02-25
9
管理
问题
Unlike other primroses, self-pollinating primroses do not need to rely on insects for pollination. In many years insect pollinators are scarce, and in those years a typical non-self-pollinating primrose produces fewer seeds than does a typical self-pollinating primrose. In other years, seed production is approximately equal. Thus, self-pollinating primroses have the advantage of higher average seed production. Aside from seed production, these self-pollinating primroses are indistinguishable from non-self-pollinating primroses. Nevertheless, self-pollinating primrose plants remain rare among primroses. Which one of the following, if true, most helps to resolve the apparent discrepancy in the information above?
选项
A、Insects that collect pollen from primroses do not discriminate between self-pollinating primroses and non-pollinating primroses.
B、When insect pollinators are scarce, non-self-pollinating primroses produce larger seeds that are more likely to germinate than are seeds from self-pollinating primroses.
C、Self-pollinating primroses that are located in areas with few insects produce no fewer seeds than do self-pollinating primroses that are located in areas with many insects.
D、Many primroses are located in areas in which the soil conditions that are optimal for seed germination are not present.
E、Self-pollinating primroses can be assisted by insects during pollination but do not require the assistance of insects to be pollinated.
答案
B
解析
一种植物数量的多少,与其种子的数量以及种子的发芽率有关,一种植物在种子的数量较多但发芽率很低的情况下,其数量就有可能不会太多,选项(B)给出了两种樱草种子发芽率的差异,从而解释了论述中的明显分歧。
转载请注明原文地址:https://tihaiku.com/zcyy/3972899.html
相关试题推荐
Unlikeotherprimroses,self-pollinatingprimrosesdonotneedtorelyoninsect
Unlikethatofhumanbeings,whowasteawaywhentheygowithoutfoodforlongp
Unlikeahurricane,whichcanbeobservedfromwithin,atornadoissosmalltha
Likethecolor-discriminatingapparatusofthehumaneye,insects’eyesdependo
UnlikethelivesofPushkin,Gogol,Tolstoi,andDodtoevski,subjectsofotherT
Unliketransplantsbetweenidenticaltwins,whosegeneticendowmentisthesame,
Unlikeinothertransportationindustries,therearenominimumstandardssetby
UnliketheircounterpartsinotherWesterndemocracies,theAmericanlabormovem
UnlikethatoftheNativeAmericansofBritishColumbia,thePlains,andtheSou
UnliketheShlites,whoconstitutetheothermajorbranchofIslam,theSunnites
随机试题
Ourtheoriesabouthumandiseasearetheproductofcurrentfashion【M1】__
教师在讲授“蛋白质的结构和功能”时,采用概念图的形式进行小结,这种结束方式属于(
患者,女,67岁。平素体弱消瘦,近日外感,出现身热,微恶风,少汗,头昏,心烦,口
经行风疹块风热证的经血特点是()A.月经多推迟,量少色淡 B.月经多提前
1.手车开关每次推入柜内后,应保证()、()和()。 A.电气位置显示正
在管理的基本职能中,能确定物业管理方向性的职能是()。A:决策B:计划C:组
人力资源部有甲乙两个会议室,两个会议室均有5排座位。甲会议室每排可坐8人,乙
东山市税务局发现甲公司偷税漏税,进行调查后,冻结了银行账户,查封了办公室,扣押了
(2018年真题)下列合同法律关系主体中,属于法人的有( )。A.某商业银行北京
建设工程项目实施阶段策划的主要任务是()。 A.定义项目开发或减少的
最新回复
(
0
)