空气中的氧气和二氧化碳是花卉进行光合作用和呼吸作用必不可少的气休,是花卉生命活动中的重要因素。氧气:花卉昼夜都要吸进氧气,放出二氧化碳,因此通气条件好利于花卉生长。种子发芽需要氧气,如果将种子长时间泡在水中,就会因缺氧,呼吸困难而不能发芽。二氧化碳:这是光合作用的原料。所谓光合作用,绿色植物的叶子在阳光的照射下叶肉组织中的叶绿体,将空气中的二氧化碳和植物根部由土壤中吸收的 Oxygen and carbon dioxide in the air are essential for the photosynthesis and respiration of flowers. It is an important factor in the life of flowers. Oxygen: Flowers must be sucked into oxygen day and night, emit carbon dioxide, so ventilation is conducive to the growth of flowers. Seed germination need oxygen, if the seeds soaked in water for a long time, it will be due to lack of oxygen, difficulty breathing and can not germinate. Carbon dioxide: This is the raw material for photosynthesis. The so-called photosynthesis, leaves of green plants in the sunlight under the chloroplasts in the mesophyll tissue, the air of carbon dioxide and plant roots absorbed from the soil