In spring, the mimosa sprouts, green, and the pole is only 1 to 2 decimeters long. In summer, mimosa is luxuriant in foliage and leaves are very strange. It is a very thin stem, and there are some fine things like small needles on both sides, much like the leaves of Metasequoia glyptostroboides. In autumn, mimosa blooms, and the flowers are fluffy, pink and purple. Although it is small and unremarkable, when you look closely, you will find it beautiful and lovely. This is a delicate beauty, very charming. In late autumn and early winter, mimosa will bear fruit, just like lentils, with a green shell outside and seeds inside. After a while, the shell turns brown. Soon, the seeds jumped out of the shell and landed on the soil. When it takes root and sprouts next spring, it will reproduce from generation to generation, and its interest rate is no different from other plants. What makes people wonder is why the leaves droop and close when they touch it. I was puzzled, so I had to look for information on the Internet. ?
It turns out that mimosa once lived in the desert, and tornadoes often appeared in the desert. When the sand rolled up by the wind touched the leaves of mimosa, mimosa felt very painful and the leaves closed. In the long run, it will become grass that closes as soon as it touches leaves. There is a pouch for storing liquid on the stem of the petiole of mimosa, just like an oil cylinder in a hydraulic press. Usually, the bag is full of liquid. When you touch the leaves, the liquid in the bag flows to the upper and both sides of the leaves, and the leaves close under the action of gravity. Calm down for a while, the liquid slowly flows back into the bag from both sides, and the leaves spread out again. ?
Sometimes, I touch them on purpose and make fun of them. ?
My cactus has a flat stem with many thorns on it. I once heard the teacher say that cactus has adapted to the desert climate, its leaves have turned into thorns, its stems have become fat and fleshy, and it has grown a lot of hair. Its stem is enlarged because it needs to store nutrients in rainy season and reduce water evaporation in dry season. I was shocked by its "survival of the fittest". ?
However, what shocked me even more was an incident that happened in the summer vacation. ?
I remember that during the summer vacation, my cousin, four years older than me, came to visit, and somehow a sore grew on his foot, which made him cry and scream, which can be said to be fidgeting. Later, my mother didn't know which book to find a remedy: cut cactus into pieces, mash it and apply it to the sore. I cried as soon as I heard it. "Want to cut my baby? No! " My mother and my brother prepared for a long time before I promised them to cut a piece. After a few days, the sore on my cousin's foot really disappeared. I thought, "This method is clever, but my cactus is definitely going to die." A few days later, the "wound" of cactus slowly dried up and healed, leaving only a white scar. At this time, I can't help but respect cactus.