9.The toxic plants

　　　　On the earth, we can see various plants, and one type of those plants is toxic plants. The toxic plant is that it has poison on a part of its body or all of its body. Sometimes it is called a poisonous herb, but contain woody plant is called toxic plants.

              The toxic plant inhabit in various place all over the world. Its poison is a lot of types. When human or animals touch or eat, the strong poisons are cause inflammation, develop symptoms of poisoning, convulsion, vomiting etc. Sometimes they are died by poisons. Also, the weak poisons are cause a little pain, feel hot taste or bitter taste. However, the toxic plants are sometimes valuable. A few of them are eaten. For example, a ginkgo nuts and a potato are toxic plants which are eaten. They are eaten after they are processed. Also, some toxic plants are medicinal plants. However, the medicinal plants become poisons when we use over fixed amounts. The plants that are not eaten and especially they have strong poisons are called toxic plants. So, the toxic plants are not so many species.

              The toxic plants are used various things. They are used killing insects and poisons arrows which use hunting. Also, the famous thing is a mosquito repellent coil.

              The difference of poisonous or nonpoisonous is classified by a kind of animal species. For instance, the Welsh onion and the onion that are eaten frequently by human and are not poisonous for human are poisonous for dogs and cats because they don’t have processing power of the Welsh onion and the onion. So, they may be emerged severe trouble. Contrary to this, except for human usually eat one thing, but this may be poisonous.

              Also, the toxic plants sometimes influence interesting effects for the plants in survival strategy. The danaid butterflies eat toxic plants when they are young and they store its components. So, a kind of animals which eat insects feel distaste. Because of this, when the denaid butterflies are adults, they are not eaten by them. The insects which have these effects are tend to warning coloration because a same kind insects became hard to be eaten.

              The toxic plants are very interesting plants. They have various effects. And, we may be died by their poisons. So, we have to be care for them. However, they are sometimes used good for animals and other plants. I think we should have more knowledge of them.

Refernce: http://www.st.rim.or.jp/~samacha/CareF/DietF/Toxic1.html

              http://home.hiroshima-u.ac.jp/honce/defense.htm