I discovered the secret topic of leaves. Composition 1 Life is a kaleidoscope. As long as we have eyes to discover beauty and explore the secrets of life, we will gain a lot.
I remember one autumn, there was a golden oval leaf floating on my desk. I picked it up curiously and studied it carefully. Suddenly found that there are many criss-crossing lines on it.
I felt very strange and thought: What are these lines? What's the use? After class, I came to the science teacher's office with this big question mark. I told my teacher all my findings and doubts. I thought the teacher would answer them for me one by one, but the teacher only told me that the lines on the fallen leaves were veins. As for the function of vein, the teacher asked me to look up the information myself to find the answer. Although a little disappointed, I am a person who never gives up after crossing the bridge. When I came home from school, I couldn't wait to open 100 thousand why. After watching it for two hours, I found the answer I wanted. It really pays off.
It turns out that there is a lot of water and nutrients flowing in the veins, and the whole plant can transport the water and nutrients to other parts through the transportation of the veins. These veins are as important as our blood vessels. Another function is to support leaves. Without the support of veins, the leaves will hang their heads and squeeze together, and they can't stretch any more. I suddenly realized that it was amazing, but I was very happy because I finally solved the secret of the leaves.
There are still many secrets in the world waiting for us to explore and discover.
I discovered the secret topic of leaves. One day at noon, I went downstairs to play, and what I saw was the fallen leaves on the ground, like a yellow carpet. Why do leaves turn yellow in autumn? Why do leaves fall? I've been thinking about these two questions since I got home.
With the help of my mother, I solved the first problem. It turns out that there are a group of "makeup artists" in the leaves of plants. Their names are strange, such as chlorophyll, lutein and anthocyanin. Because of the different proportion and content of pigments, leaves show colorful postures. In spring and summer, when the chlorophyll content is high, the leaves appear chlorophyll green. The synthesis of chlorophyll requires strong light and high temperature. In autumn, with the decrease of temperature and light, the proportion of chlorophyll decreased, and the leaves showed yellow lutein. It's interesting that leaves turn yellow like this!
Later, I found the answer to the second question and knew how the leaves fell. Petiole used to grow stiffly on the branches, but in autumn, as the temperature dropped, several layers of fragile parenchyma cells formed at the base of petiole. Because these cells can be easily separated from each other, they are called delamination. After the separation layer is formed, the petiole will break when a slight breeze blows. As a result, the leaves fell.
By observing and looking for answers, I discovered the secret of leaves!
I discovered the secret topic of leaves. There are many mysteries in beautiful nature, such as the secret of gecko tail regeneration, the secret of dragonfly flying low, the secret of ant communication … There are so many secrets, but what I want to know most is the secret of leaves turning yellow.
One day, my mother took me to the park to play. When I was walking, I suddenly saw many fallen leaves on the ground. Many of them are yellow. Those leaves are all kinds, and there are many thorns beside them, some are very long and some are very big. Those leaves are really different in shape!
I picked up a leaf from the ground and studied it carefully in the sun. I found that the leaves were yellow and many thin short lines were found beside them. I didn't know what it was, so I ran to ask my learned father, and he replied, "It's a vein of a leaf!" " "I heard, an epiphany!
I carefully looked at the leaves on the ground and found that almost all of them were yellow. I thought to myself: Why do the leaves turn yellow? I am confused and anxious. I'll go home right away and take out my "100 thousand whys" I looked for it for a long time, and everything paid off. I finally found that leaves contain a lot of chlorophyll and lutein. In autumn, plants began to cut off the nutrient supply to the leaves, resulting in a decrease in the amount of chlorophyll, so the leaves were yellow, red and other colors. I finally knew why the leaves turned yellow, and jumped three feet high with joy.
In nature, I understand that we should observe everything carefully. Only in this way can we understand the mysteries of nature.