Have you ever wondered if plants lose water from their leaves? This week we're going to do an experiment to find out.
What you will need:
Various kinds of leafy plants
Small plastic bags or ziplock bags
Tape (optional)
▲ Before you start, note that this works best on plants exposed to the sun.
▲ Put a plastic bag around one leaf on each plant. Close the bag in such a way that water won't be able to easily escape. Be careful not to crush the stem of the leaf.
▲ Close another bag and leave it to one side. This is your control.
▲ Periodically take a look at the bags. Note how much moisture appears in each of the bags.
▲ After a couple hours, take the bags off the plants and record your observations.
(MICHAEL KEARNEY, STAFF WRITER)
你是否曾想過植物內的水分會不會從它們的葉子流失呢？這個星期，我們將要做實驗來驗證。
所需材料︰
各類多葉植物
小塑膠袋或是封口袋
膠帶（可有可無）
▲實驗以前，請注意：如果將植物暴露在陽光下，實驗效果會最好。
▲將塑膠袋套在每一株植物的其中一片葉子上，然後將袋口封好，讓水氣不容易跑掉。請小心不要把葉柄給壓壞了。
▲將另一個塑膠袋也封好，然後放置一旁，作為對照組。
▲定期觀察這些塑膠袋，注意每一個袋子有多少水氣出現。
▲數小時後，將塑膠袋從植物上拿下來，並記錄所觀察到的現象。
（翻譯︰楊鴻泰）
Look up some information about plants on the Internet or in a biology book. Where do plants take water in? How does water travel to different parts of plants? Where do plants lose water? Why do plants in the desert usually have small leaves (or no leaves at all)? Where do plants tend to have broad leaves?
上網或是參考生物學書籍，查詢有關植物的資訊。植物是從哪裡吸收水分的？水分是如何輸送到植物的各個部位？植物的水分從哪裡流失？為什麼沙漠裡的植物葉子通常很小（或根本沒有葉子）呢？生長在哪裡的植物比較會有寬大的葉子呢？
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