题目

听短文,回答问题。 (1) What activity is the short passage mainly about? A . Going camping. B . Climbing mountains. C . Planting trees. (2) How long will it take the students to go to the park? A . One hour. B . One and a half hours. C . Half an hour. (3) What will the school provide? A . Water. B . Umbrellas. C . Lunch. (4) What can't the students learn from this activity? A . Working skills. B . How to enjoy nature. C . How to study well.某研究小组以吊兰为实验材料,开展了单侧光照及一定浓度的Ca2+、La3+对吊兰根生长影响的研究,经过相关处理后,测定了吊兰根的弯曲度及生长素(IAA)的浓度,结果如下表。请分析回答问题:组别处理结果弯曲度α/oIAA/(ngg-1FW)光Ca2+La3+向光侧背光侧1---0299.5300.22+--71.3178.6416.33++-82.4143.3444.44+-+0296.6296.5注:“+”代表施加处理,“-”代表不施加处理。(1)吊兰根除了合成生长素(IAA)外,还能够合成___________________(填植物激素名称)促进植物生长。(2)上表中的__________组和_________组的实验对照说明,单侧光照射下生长素在根部发生了横向运输。(3)通过对上表中__________组的数据进行对比分析,可以得出结论,Ca2+和La3+对生长素的横向运输可能产生__________作用。(4)该实验_______(填“能”或“不能”)说明Ca2+能引起根部生长素的横向运输,依据是__________________________________。
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