正在结西瓜的植株，其吸收的水分主要用于
A．气孔的水分散失
B．光合作用
C．瓜果的膨大
D．植株的生长
答案：A
根吸收来的水绝大部分通过蒸腾作用蒸发到大气当中去了，少部分被当做光合作用的原料被植物体利用．据此作答．
解：植物通过根从土壤中吸收水分，吸收来的水只有大约1%当做光合作用的原料被植物体利用，大约99%都通过绿色植物的蒸腾作用以水蒸气的形式散发到大气当中去了．这不是对水的浪费，绿色植物的蒸腾作用有其积极的意义．故A是正确的．
故选：A
绿色植物的蒸腾作用在中考中经常出现，要注意理解掌握．
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| Height is just one of the thousands of features your genes (基因) decide. In fact, because you have two parents, your genes provide you a height that usually lands somewhere between the height of each parent. If both your parents are tall, then most probably you will be tall, too, but if you have questions about how tall you're going to be, ask your doctor if he or she can help you find it out. But genes don't decide everything. For example, eating an unhealthy diet can keep you from growing to your full potential (潜力). Getting plenty of sleep and enough exercise will help you grow to the expected height. No doubt you're wondering how fast you should grow. It depends. There's no perfect or right answer. Generally speaking, kids grow about 2 inches (6 centimeters) a year between age 3 and the time when they start puberty (when your body starts changing and becoming more grown up). Your doctor will know how your growth has been going over the years. Two centimeters here and 2 inches there are not nearly as important as the height you're at now, how you've been growing up to this point, and what other changes your body may be going through. Don't be scared if you seem to have grown a lot in a very short time. Everyone has a growth spurt (高峰) during puberty. The age for starting puberty is about 10 for girls and about 11 for boys. But it can be earlier or later-between 7 and 13 for girls and 9 and 15 for boys. You'll usually begin to notice that you're growing faster about a year or so after your body starts to show the first changes of puberty. | ||||
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