(三) 葉1.葉的功能一、光合作用:葉是植物最重要的營養器官,是主要製造有機食物的地方。它利用由根輸入的水分、養料及由空氣中吸入的二氧化碳,在陽光下合成澱粉之類的有機物,並放出氧氣,這種作用叫做光合作用。由植物葉所製造出来的營養物質不僅供給它本身生長用,一部分並儲存在果實,種子或地下器官等地方,這些儲藏的營養物質並成为人類食物的主要来源。 (III) Leaf 1. Function of leaf 1. Photosynthesis: Leaf is the most important vegetative organ of plants, and it is the place where organic food is mainly produced. It uses the water and nutrients input from the root and the carbon dioxide inhaled from the air to synthesize organic substances such as starch in the sun and releases oxygen. This effect is called photosynthesis. The nutrients produced by the leaves of plants not only supply its own growth, but are also stored partly in fruits, seeds or underground organs. These stored nutrients become the main source of human food.