I caught a little spider from the corner and put it in a box (with holes around it and glass on it for easy observation). Before the spider could weave a web, I picked up a dead bug and a dead fly and put them in front of the spider. The spider ignored them, then hit the box with her hand, and the spider crawled in other directions.
In order to find out whether spiders eat dead flies completely, the next day, I came to the box to observe and saw that dead insects and dead flies were still in their original places, but there was a net in the corner of the box, and the spider was lying quietly on the net. At this time, I thought: Is it because there is no net that the dead flies and insects didn't eat it yesterday? So I picked up the dead fly and gently put it on the net, but the spider still didn't move. Then, I gently touched the edge of the net with my pen. Gee, the spider seems to have a reaction and started to climb in a trembling direction. I took the pen back and the net stopped shaking. The signal was interrupted and stopped. Soon, the spider climbed to the center of the web again. I touched the dead fly's body on the net with the pen tip again, and the net began to vibrate, and spiders began to crawl here. I took back the nib again and the spider stopped. Like last time, after a while, the spider climbed to the center of the web again. Oh! I finally understand that spiders feel by the vibration of their webs and prey by weaving them. So, I recorded the experimental results.
In order to prove that spiders feel through the vibration of their webs, I did another experiment. Put the pen tip on the dead fly on the net and vibrate for a long time. The vibration of the web is getting bigger and bigger, and the spider seems to feel stronger and stronger. Spiders will come in a hurry. When a spider meets a fly, I will take back the pen tip, only to see that the spider's tail will soon spit out sticky silk to tie the fly, and then look at the spider's back, as if sucking the fly. Soon, there was a complete empty shell left on the Internet. This experiment proves that spiders eat moving insects.
Our secret group went to the library and bookstore to consult a lot of books about spiders. Among them, General Zoology wrote that spiders are carnivores, and their food is mostly insects or other arthropods. But the mouth has no upper jaw, so you don't swallow solid food directly, but suck it slowly. When insects and other animals come into contact with the net, they will struggle desperately on the net to make the net silk vibrate, so that spiders will find it soon. Spiders will crawl along the longitudinal silk to their prey, wrap the prey with spider silk and fix it on the net. First, the venom secreted by poisonous glands in claws is injected into the captured prey to kill it, then the digestive enzyme secreted by midgut is injected into the captured tissue torn by claws, which is quickly decomposed into juice, then inhaled into digestive tract, and finally eaten the remaining body shell. These fully prove that flying insects make the spider's web vibrate, and the web vibration will make it feel, and the spider will catch its prey if it feels. So it is confirmed that spiders only eat live animals, not dead insects.
Why do maple leaves turn red in autumn?
First, ask questions.
As we all know, maple leaves turn red in autumn, like a burning flame, very beautiful. But do you know why maple leaves turn red in autumn?
Second, answer the question.
It turns out that after autumn and winter, deciduous trees will undergo some chemical changes in their bodies, so that useful substances or some tissues contained in the original leaves can be recycled and stored in stems or roots, which can be reused next spring. Chloroplast and chlorophyll are one of the objects that are decomposed and recycled. Therefore, when the chlorophyll in the leaves is gone, the colors of other pigments are highlighted, such as the red of anthocyanin and the yellow of carotene, and then the leaves are adjusted for the winter!
Besides chlorophyll, there are many other pigments in plant leaves, such as yellow lutein, carotene and red anthocyanin. (Anthocyanin is red in acidic solution and purple in alkaline solution), but because of its high chlorophyll content, it covers other colors and makes the leaves green. In autumn, due to the temperature drop, chlorophyll gradually decomposes, and the colors of other pigments are exposed. In addition, the sugar stored in maple leaves will be decomposed into anthocyanins, making the leaves brighter.
Third, summary.
This is why the maple leaves turn red. In life, there are many such examples. As long as everyone pays attention to observation, studies diligently and asks questions diligently, there will be unexpected gains.
Can fish talk?
Do you believe that fish can talk? This is an intriguing thing. I wonder if fish can talk.
My family bought two small goldfish, one is all black, and the black one is called Lele, because it is very happy. A red and white name is Xinxin, because it knows how to appreciate. Isn't it fun? They live in a fish tank, which is "unusual". There are mountains, flowers, trees, shells and colored stones. Isn't it beautiful? Let's take a look together!
At about five o'clock in the morning on September 23rd, I was about to breast-feed. I saw such a phenomenon. I spilled fish food into the fish tank, but Lele ate a little and stopped eating.
At 5 pm on September 23rd, I saw the shell in the fish tank turned upside down. Xiao Xin saw it, as if she thought-this little shell was going to die. She swam quickly and reached it with her head. After three or four minutes, I can't reach it. She swam to Lele, swept Lele with her tail, and then touched her head. Lele and Xinxin are together.
Through two observations, I know that human beings have their own expressions and communication languages, and animals also have their own kingdom expressions and communication. This also tells us that if you don't unite, then you will have nothing, and the friendship between friends is really great. At the same time, you should observe more and find more, but you can't hurt small animals just because you are doing experiments on them, because animals are friends of human beings.
Why don't ants get lost?
Ants, I believe everyone is familiar with them. Then who can really understand ants? Why don't ants get lost?
With this question, I consulted some books. According to the book, ants leave some smells along the way after starting from the nest to their destination, and then return to the nest. Touch each other with tentacles and notify other ants. Scientists have done an experiment on this problem. Scientists first identify an ant and vigorously clean up the place where he reaches his destination along the way. When the ant came back, it suddenly stopped at the place where the smell was wiped off. Looking for something while walking in circles. People come to the conclusion that ants can tell their directions by their sense of smell.
In order to confirm this conclusion, I did an experiment. I first prepared a twig about 10 cm, and put the bait-small candy on one end of the twig. I put this device near an ant nest. After a while, an ant came out to explore the road. After I led him to the stick, he went to the place where the sugar was put, as if he were smelling it. I took this opportunity to cut off the broken part of the stick by one centimeter. When the ant came back, it turned left and right where it was cut off, but it couldn't find its way home.
After a while, I repeated the above experiment, and the ants still didn't find their way home.
Through these two experiments, I finally know the secret of ants not getting lost. It turns out that ants can tell the direction by smell.
Knowing the secret of ants, I was thinking: Can you make an ant alarm? When an ant approaches the alarm, the alarm can "smell" the ant and then chirp to let us know that the ant has gone to the cupboard or other places.