There are many wonderful phenomena in nature, waiting for us to find the answer. I haven't watered the flowers for many days, and the flowers withered, but I found that the cactus is still alive. What happened? I carefully observed the cactus, and the part near the soil was a khaki cylinder, then it was green, flat upward, like a thick palm, and several pieces were connected together, with clusters of yellow thorns on it. I am curious. At that time, I kept thinking, why does cactus grow thorns? Why doesn't it grow green leaves like other flowers?
What makes cactus so drought-tolerant? I found a pot of jasmine and cactus and made a comparative experiment. Put a plastic bag on each pot of flowers, and wait until the next day to see which plastic bag has more water vapor, which means which pot of plant water evaporates badly. The next day, I found that there was more water vapor in the plastic bag on the jasmine, but little water vapor on the cactus. It turns out that the water vapor evaporation of cactus is less! So I looked up some information.
It turns out that the leaves of cactus evolved into needles, which reduced the evaporation of water. Sharp thorns can prevent thirsty animals from treating it as a free drink.
Cactus grows in the desert of Africa, where the climate is hot and dry, and its leaves grow into needles, which is beneficial to prevent water evaporation and loss. It is called survival of the fittest. At the same time, it saves the consumption of water in the body. Green stems substitute leaves for photosynthesis to produce nutrients. This prickly change of cactus meat is the result of long-term adaptation to adverse environments such as high temperature and drought.
Knowing this, I am very happy, because I have gained some knowledge!
So I also understand that plants like cactus are drought-tolerant and don't need to be watered frequently, such as Lingjianlian, fairy mountain, Xianzhi, cactus and so on. There is a lot of knowledge in life waiting for us to learn, and there are many problems waiting for us to explore. I want to read more books. We should learn from the spirit of scientists' continuous exploration, constantly enrich ourselves and be a useful person to society.