【题目】植物生长素具有低浓度时促进生长、高浓度时抑制生长的特性。以下哪一现象或应用不能说明生长素调节具有“两重性”
A.在自然状况下,大型乔木的树冠多呈圆锥形
B.被大风刮倒的树木,其露出地面的根总是向地生长
C.置于窗台上的盆栽植物总是朝窗外生长
D.棉花的顶芽比侧芽生长快
【答案】C
【解析】在自然状况下,大型乔木的顶端产生较多的生长素,生长素高,由于顶端向下运输,导致侧芽处的生长素浓度升高,离顶端越近的芽生长素的浓度越高,这种高浓度的生长素抑制了侧芽的生长,而顶芽处则由于生长素向下运输,生长素的浓度较低,所以生长的较快,使树冠多呈圆锥形,A错误;由于重力作用,生长素横向运输,使刮倒的树木露出地面的根处近地侧生长素浓度高,远地侧浓度低;又根对生长素浓度最敏感,低浓度促进生长,高浓度抑制生长,所以根总是向地生长能说明生长素调节具有“两重性”,B错误;置于窗台上的盆栽植物,由于单侧光的影响,背光的一侧生长素浓度高,促进作用大,生长快,所以总是朝窗外生长,只体现了促进作用,C正确;顶端优势中,顶芽优先生长,侧芽的生长受抑制,说明生长素调节具有“两重性”,D正确。
科目:高中地理 来源: 题型:
【题目】完成句子
1.延时航班何时起飞取决于天气。
When the delayed flight will take off .
2.这种药一天要服三次。
The medicine three times a day.
3.为了不上课迟到,我们最好快点。
We had better hurry up for class.
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【1】 What is the main idea of Paragraph 1? (no more than 8 words)
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【2】 Fill in the blank in Paragraph 2 with proper words. (no more than 7 words)
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【3】 Explain the underlined sentence in Paragraph3.
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【题目】完成句子(每小题1分,满分4分)
1. —你要去北京吗?
—是的,两个月后回来。
—__________ you __________ for Beijing?
—Yes. I’ll come back in two months.
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科目:高中地理 来源: 题型:
【题目】A
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【】Americans take a holiday trip ___________.
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【】According to the passage, which of the following is NOT true?
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B. The bed-and-breakfast inns are private homes opened to vacationers.
C. The bed-and-breakfast inns have been popular in America for a long time.
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【题目】七选五
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Make home a happier place to be
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