Tell me about your understanding of the secrets of nature.

I discovered the mystery of cactus. On Sunday, I enjoyed my father's cactus at home. Suddenly found that cactus, cactus, cactus whip and other cactus plants have a common feature, that is, the stems are thick green, with many spikes on them. I asked my father, "Why does cactus look like this?" Dad said: "Because the plants of the family Immortaceae originated in Latin America and gradually evolved and survived in the arid desert, their structures have strong drought-resistant characteristics." I look around and admire this special flower curiously. Why does cactus have no leaves, only thorns that sting people? Without leaves, how can it absorb and transport nutrients? How can you live so well?

Through careful observation and searching for relevant information, I finally discovered a secret. It turns out that the thorns on the cactus are changed by leaves. Because cactus lives in the desert for a long time, where it is hot and dry, if it grows big leaves, a lot of water will evaporate from the leaves. Therefore, the leaves of cactus become thorns, and the fleshy stems store sticky pulp, which can better absorb and maintain water in the body. Ah, the thorns on the cactus are leaves! I finally understand that cactus is thick and prickly, which is the result of adapting to the arid environment.

In addition, my father also told me that the large area of cactus thorns will not only reduce water loss, but also make other animals afraid to hurt it. I didn't believe it, so I touched the prickle of cactus with my hand. It really hurts! No wonder people dare not touch it. Cactus is too clever. It knows how to change itself flexibly in order to survive. A thorn is a leaf, and a leaf is a thorn. This is the secret of cactus I discovered. I believe that problems in life are everywhere. As long as you are good at observing, you will find more secrets.

I discovered the secret that chickens eat stones.

On Sunday, my brother and I went to grandma's house to play. My brother said to me, "Let's go and see if grandma's chicken has laid eggs." I quickly followed my brother to the backyard and saw a group of old hens looking for something to eat with their heads down on the small sand pile in the henhouse. My brother and I thought they were looking for bugs. Take a closer look at those old hens looking for pebbles to eat in the sand! I'm surprised. He asked his brother, "Why does the old hen eat stones?" My brother scratched his head and said, "I don't know!" "Let's look for" 100,000 Why "and have a look! My brother and I hurried to the house and took out "100,000 whys". It turns out that chickens have no teeth, so they have to grind food in their stomachs with stones. Some foods are difficult to digest only by the peristalsis of chicken stomach. Only by rubbing them with stones can they become mushy, which can help them digest all the food they eat. I looked at my brother and said, "There are so many interesting things in life, waiting for us to observe and discover." My brother nodded and said, "Then let's explore and discover together! "

I discovered the secret of mimosa.

On Sunday, after I finished my homework, my mother took me to play in Jiangbei Park. I saw some mimosa plants in the grass, so I went to play with them. Its branches have bristles, its flowers are pink, its inflorescence is spherical, as light as a furry ball, and it is very beautiful. I gently touch the delicate leaves of mimosa, and it will close. Why do mimosa have such interesting characteristics? I went to ask "100,000 Why" and told us that there is an enlarged part at the base of the petiole of mimosa called "leaf pillow", and parenchyma cells are produced in the petiole. When the leaves are touched by the outside world, the vibration will be transmitted to the leaf pillow. At this time, the cell sap in parenchyma cells immediately flows to the intercellular space, which reduces the expansion ability of cells, leaves automatically close, and petioles and branchlets droop at the same time. In a few minutes, they will return to their original state. The function of the old branches and leaves of Mimosa is weakened or disappeared, which is also a self-protection ability of Mimosa. Therefore, leaves are the most interesting part to enjoy and play. However, we

Don't touch mimosa often, so as not to affect its growth.

I am very happy today. Because I know the reason why the mimosa is closed, I have increased my knowledge. What an honor! In my later life, I will observe more carefully and gain more knowledge.

Found the secret of fish sleeping.

Samuel Smythe, a scientist, said, "Careful observation of small things? It is the secret of success in career, art, science and life. " I used to be dubious, but now I have to believe it because I have experienced such a thing. Today, my father will take me to my uncle's house, so he bought me a beautiful little goldfish for fear that I would be bored. When I arrived at my uncle's house, I put the goldfish on the table and observed it carefully. It has big eyes and is dressed in gold. Really like a little princess. I looked at it and thought, "How does the little goldfish sleep?" Ask dad: "Dad, the little goldfish is so cute, so how does it sleep?" I shouted. Dad smoked a cigarette and said, "Oh, why are you so stupid?" ! When everyone is asleep, doesn't the little goldfish sleep like this? Don't you know if you go and have a look? ""yes! Thank you, Dad. " Say that finish, continue to observe the little goldfish. Finally, as night fell, everyone went to bed. I got out of bed carefully for fear of waking everyone, got dressed and walked to the table. I saw the little goldfish motionless, with eyes open, except for a slight movement when the gill cover was opened and closed. "What's the matter, little goldfish don't sleep? "Whisper a few times and went back to bed. After about ten minutes, I went to see the little goldfish again, and the result was still the same, so I had to "get nothing". Back in bed, I tossed and turned and couldn't sleep, thinking, "Will the little goldfish die? "But I am still alive and kicking in the morning! Numerous questions flashed through my mind. " Forget it, or consult books tomorrow! "To himself. As soon as I got up, I took the book "100,000 Why" to find the answer. There is a page devoted to fish.

How to sleep, there is a paragraph that reads: "Because.

Fish have no eyelids. If you see a fish motionless in the water with its eyes open, it is that the fish is sleeping. "Suddenly, my face turned red, because I didn't read many books, so I didn't even know this. Make up your mind: We must explore the mysteries of science and learn more about it. So there is no science without observation, and science is born from careful observation. As long as you pay attention to everything in your life, you can solve every mystery.

When the earthworm is cut into two sections, the muscle tissue on the section immediately contracts under suitable conditions such as temperature, pH, sterilization, etc., some muscles quickly dissolve themselves to form new cell clusters, and at the same time, white blood cells gather on the section to form embolism, which makes the wound close quickly. The primary cells located in the septum of body cavity quickly migrate to the slice and form nodular regeneration buds on the slice together with their dissolved muscle cells. At the same time, the cells of digestive tract, nervous system, blood vessels and other tissues in the body quickly grow into regenerated buds through a large number of mitosis. In this way, with the continuous proliferation of cells, a new head will grow on the section lacking the head; The tail will grow on the part where the tail is missing. So one earthworm becomes two complete earthworms.

Why do snakes shed their skin?

Why do snakes shed their skin? Snakes are covered with scales, but these scales are different from those of fish. The scales of snakes are made up of the outermost stratum corneum of the skin, so they are called horny scales. It is tough and impervious, and can't grow with the growth of the body. When a snake grows up, it needs to molt once, and the new scales after molting are bigger than the original ones. Snake scales can not only prevent water evaporation and mechanical damage, but also be the main tool for snakes to crawl. Snakes usually molt once every two or three months. When a snake molts, it should choose rough ground or twist its body around branches to take off its old "coat" by friction.

Put on "new clothes", so snake slough can be seen in caves or branches.

This is a biological feature. Every living thing has different physiological functions, so it has something special. Gecko breaks its tail to escape capture, but it can grow a new tail. They have a hormone in their bodies that can regenerate their tails. When the gecko's tail is broken, it will secrete this hormone to make the tail grow. This hormone is generally called growth hormone by scientists.

In fact, it is the same as all of us seeing hair and nails grow. Some cells can regenerate, while others cannot. Gecko's tail contains regenerative cells, which can be activated by hormone stimulation to grow a new tail. Some animals, such as earthworms, can grow again when their bodies are broken.

Prevent falling—

According to a paper published in the Proceedings of the National Academy of Sciences, biologists at the University of California, Berkeley, found that geckos rely on their tails to prevent them from falling from vertical surfaces. If they do fall, they will rely on their tails to adjust themselves in the air and land safely like skydivers. This discovery helps engineers to design climbing robots with better performance, and may play a role in the design of unmanned gliders or spacecraft. Researchers say that perhaps designing a flexible tail can help astronauts work more comfortably in space. The fifth leg—

An active tail, like the fifth leg, prevents them from falling backwards. This is the hidden function of the tail. What does it tell us? Active? How the tail affects the performance of vertebrates.

Because there are many nerves in the broken tail, after the tail leaves the body, the nerves do not lose their function immediately, so they can still swing.

When the gecko was attacked by the enemy, its muscles contracted violently, causing its tail to break. The tail that has just been broken is always moving because the nerve is not dead, so it can be used to protect itself from running away.

This phenomenon is called "limb-breaking to save oneself" in nature, and it is not only a gecko, but also a common phenomenon among Diptera mosquitoes. The big striped legs are thin and long, which is very eye-catching. They are easy to fall off after being caught or touched, but the bugs themselves will not be hurt, but they can take the opportunity to escape.