大蒜是一种常见蔬菜 ,既可食用又可药用 ,在中学生物教学中也有多种用途。1)大蒜根系是观察须根系的好材料　作法 :取大蒜去掉外皮 ,放入干净的培养皿中 ,培养皿内放水 ,培养蒜根 ,大约 1周左右即可长出 2～ 3cm长的不定根 ,可用于观察须根系 ,效果明显。2 )大蒜根尖可用于观察 Garlic is a common vegetable, both edible and medicinal, and it also has many uses in biology teaching in middle school. 1) The garlic root system is a good material practice for observing fibrous roots: Take garlic to remove the skin, put it in a clean petri dish, put the water in the petri dish, cultivate the garlic root, and grow an adventitious root 2 to 3 cm long in about 1 week. Can be used to observe fibrous root system, the effect is obvious. 2) Garlic apex can be used to observe