仙人掌的刺是退化的叶子,能减少水分蒸发,但它的茎秆(绿色部分)却怕强光直射。正午高温时,部分仙人掌会调整茎秆角度,避免正面迎光,或通过表皮的蜡质层反射阳光,防止被晒伤。别以为仙人掌在沙漠“横着走”,其实它也会悄悄“躲太阳”,主打一个“能屈能伸”!
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