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(2 0 0 1年广东高考题 )用含有各种必需元素的溶液培养大麦。试验分两组 ,一组在光下 ,一组在黑暗中 ,48小时后测定几种离子的浓度。表中各离子下的数据为试验结束时 ,溶液中离子的浓度占试验开始时浓度的百分比。实验条件水分消耗 (ｍｌ) Ｃａ2 + (% ) Ｋ+ (% ) Ｍｇ2 + (%
(Guangdong College Entrance Question in 2001) Barley was grown in a solution containing various essential elements. The tests were divided into two groups, one in the light and the other in the dark, and the concentration of several ions was measured after 48 hours. The data for each ion in the table is the percentage of the concentration of ions in the solution at the beginning of the test at the beginning of the test. Experimental conditions Moisture consumption (ml) Ca2+ (%) K+ (%) Mg2+ (%