一、绪言植物用它的根和根上的许多细毛从土壤中吸收它营养所需要的水和矿物养料,这是大家都知道的。我们也知道植物的叶部有许多气孔,它们是植物进行光合作用时放出氧气及由大气中吸入炭酸气的工具,同时也是植物进行呼吸作用时炭酸气及氧气出入的地方。 I. INTRODUCTION It is well-known that plants absorb the water and mineral nutrients it requires for its nutrients from the soil with its many fine hairs on its roots and roots. We also know that there are many stomata in the leaves of plants. They are the photosynthetic oxygen release and carbon dioxide absorption from the atmosphere. They are also the places where carbonates and oxygen flow in and out when plants breathe.