There are four camphor trees, four willow trees and three Toona sinensis trees in front of my house. The trees are covered with green grass.

Willow is very tall and has green buds in late March and early April. Later, it grew stronger and stronger, and the Toona sinensis tree became beautiful. The leaves sparkled in the direct sunlight. Where's camphor tree? They bent down and looked shy, probably because they were watered less.

One day, I suddenly found that the leaves of camphor tree are evergreen all year round. Why? I felt very strange and decided to find out the answer. The night before, I found the best answer on Baidu. It turns out that whether trees shed leaves is determined by their long-term purchase evolution and adaptation to different natural environments. Deciduous trees shed their leaves because they have to fight against adverse environmental factors. For example, defoliation in winter is to reduce water evaporation and make the cytoplasm in the body change from liquid to gel, so as to enhance its stress resistance and thus spend the winter. When a plant leaves, abscisic acid, a plant hormone in the body, will change the separation layer between the leaf and the plant. Cells separate, so leaves fall off. Cinnamomum camphora mainly grows in subtropical fertile soil, with suitable climate, no stress and no defoliation. If you go to the north, you will lose leaves and even freeze to death in winter.

It seems that you should pay attention to everything in your life! And through the above findings, I know the importance of plants, and I must protect plants in the future.

2. Observation report on plant composition 600 words Daphne genkwa and Achnatherum splendens are common herbs.

Impatiens are native to China, Indian and Malaysian, and there are many varieties, with more than 500 species in the world, which are suitable for potted plants and garden cultivation. When cultivating, it is best to use fertile sand with good drainage.

In order to understand the germination and growth process of impatiens, I made a careful observation for 2 1 day.

First, select a few fully developed seeds, plant them in a flowerpot, then pour a small amount of water, and observe them once every morning and evening. I give it sunshine every morning, water it at night, and let it drink more rain when it rains. Observe carefully every day and make records. The experimental days were 2 1 day.

Through observation, I learned about the germination and growth process of impatiens.

Impatiens usually germinate in 8- 10 days. Sure enough, after 10 days, impatiens grew green buds. Bright green and sharp. There are still three seeds that don't seem to move. After five days, I found that three seeds had not yet grown, and two of them had sprouted one after another. Come out and have a look. A few days later, the seedlings of impatiens grew much taller. I am very happy. I planted impatiens very successfully.

Because of the rising temperature and the strong sunshine at noon, the growth of impatiens was hindered. I didn't see it grow taller or taller, and the green seedlings were a little yellow.

3. Plant Investigation Report Composition 300 words Luffa is a small plant and my favorite plant. It grows luxuriantly, blossoms again and again, bears fruit again and again, and grows for a long time. Until late autumn, it is still full of fruits and people like it.

Luffa has a strong vitality. It can grow in any harsh environment. You just sprinkle a few seeds in the crevices, under the corner, or on the barren land, and water them for a few days. It will break through the ground and grow green shoots. The growing leaves will be bitten by insects. At this time, you only need to sprinkle some wood ash on the dewy leaves in the morning to prevent insect bites. Luffa is resistant to high temperature, drought, humidity, rot and poverty. As long as you tie some ropes or sticks to it, it will climb up. Grow sturdily, like a scaffold, melons and vines can be extended to grow more vigorously.

Luffa is simple and modest. It blooms at night, and the small yellow petals are faint, not bright, not eye-catching and not fragrant. It is not as beautiful as peach blossom, and the reddish petals sometimes give off a faint fragrance. Luffa is a very common flower. The fruit of loofah is green, and it always keeps the same color as the green leaves. It's not like pepper and tomatoes. Once it matures, it will turn red, and its red face will give a sweet smile.

Luffa is full of treasures. It can not only be eaten, but also used as medicine. Tender loofah is used to stir-fry and make soup, but it tastes particularly delicious. Let people never tire of eating. Old loofah can also relieve cough and resolve phlegm. The leaves of loofah can relieve pain, and the gourd ladle can clear away heat and detoxify ... If anyone has prickly heat, it will be much cooler with loofah. See how much contribution loofah has made.

I especially like loofah, and I prefer the quality of loofah.

4. Plant Investigation Report Composition 300 words Luffa is a small plant and my favorite plant.

It grows luxuriantly, blossoms again and again, bears fruit again and again, and grows for a long time. Until late autumn, it is still full of fruits and people like it. Luffa has a strong vitality.

It can grow in any harsh environment. You just sprinkle a few seeds in the crevices, under the corner, or on the barren land, and water them for a few days.

It will break through the ground and grow green shoots. The growing leaves will be bitten by insects.

At this time, you only need to sprinkle some wood ash on the dewy leaves in the morning to prevent insect bites. Luffa is resistant to high temperature, drought, humidity, rot and poverty.

As long as you tie some ropes or sticks to it, it will climb up. Grow sturdily, like a scaffold, melons and vines can be extended to grow more vigorously.

Luffa is simple and modest. It blooms at night, and the small yellow petals are faint, not bright, not eye-catching and not fragrant.

It is not as beautiful as peach blossom, and the reddish petals sometimes give off a faint fragrance. Luffa is a very common flower. The fruit of loofah is green, and it always keeps the same color as the green leaves.

It's not like pepper and tomatoes. Once it matures, it will turn red, and its red face will give a sweet smile. Luffa is full of treasures. It can not only be eaten, but also used as medicine.

Tender loofah is used to stir-fry and make soup, but it tastes particularly delicious. Let people never tire of eating.

Old loofah can also relieve cough and resolve phlegm. The leaves of loofah can relieve pain, and the gourd ladle can clear away heat and detoxify ... If anyone has prickly heat, it will be much cooler with loofah. See how much contribution loofah has made.

I especially like loofah, and I prefer the quality of loofah.

5. Write a composition on the research report of one or two plants in the fourth grade. My name is mimosa, and some people call me mimosa and drink grass.

Many people like me, especially children. People planted my seeds in March and April in spring, and a week later, I poked my head out of the soil.

Hey! What a wonderful world! There are so many tall buildings that I can't see the top with my head up. Alas, human beings have so many fancy clothes. I have been trying to get them all my life, and now I still have thorns all over my body.

But I have pinnate compound leaves and small spherical pink flowers, which are much more beautiful than humans. However, there are still many people who look better than me, which makes me embarrassed.

So, as soon as they come near me (especially those children, who love to play with me), I close the leaves and lower my head. Ashamed to be with them-dwarfed! Fortunately, I am covered with thorns, and people dare not get too close to me.

By June 65438+10, I will have a baby. They are flat and round, hiding in pods in twos and threes. People should like them.

Actually, I am a perennial, but it's too cold here in winter. I can't stand it anymore, so I have to go back to my parents. Shh! Put your ear closer, and I'll tell you quietly that I still have the medicinal effects of calming the nerves, stopping bleeding and astringing, removing blood stasis and relieving pain. Dry my whole body. It's terrible to use. However, in order to love me and the people I love, even if it is broken, it is worth it.

6. Primary school students write a plant experiment report in 400 words. First of all, the respiration of plants is a necessary process for the survival of plants. This process is divided into aerobic respiration and anaerobic respiration. Under aerobic conditions, glucose in plants decomposes glucose by reacting with oxygen, releasing a lot of energy for plants to survive. Under hypoxia, plants break down glucose into lactic acid or alcohol, but they release a little energy. In order to survive, plants release energy to some extent, which is also a last resort. In short, respiration is a process in which plants decompose glucose into energy to obtain bioenergy. Many intermediates of respiration are used as raw materials to synthesize other compounds.

These compounds include fatty acids, protein, chlorophyll and nucleic acids. The synthesis of these compounds requires ATP and usually NADH or NADPH.

For example, a large amount of NADH is needed when nitric acid is reduced to nitrite, which obviously depends on the respiration of mitochondria. Put the plants in a closed container at night. First of all, choose a dark environment and put it in the plant for a period of time to stop the light reaction and dark reaction of plant photosynthesis (dark reaction needs ATP and H produced by light reaction, and it can be stopped when it is consumed). Put the plants in a pure oxygen environment, add appropriate nutrient water, mark them with water oxygen 18, and detect the composition of air and water after a period of time.

Breathing glucose+nourishing qi = water+carbon dioxide+energy+organic matter.

7. Pupils write a 400-word experimental report. The plant is cordate telosma There are many flowers planted on my balcony, including orchids, sunflowers and winter jasmine. They are open at different times of the year and compete for beauty. However, I like cordate telosma which is open every night in summer and autumn best.

Cordate telosma is a beautiful yellow-green flower that blooms slowly in the dead of night. At this time, you will feel how lovely it is! How its flowers are like small speakers, praising people who are still working tirelessly at night; How like a little girl in a skirt, singing and dancing in the green ocean, and her songs echoed in the night wind. The leaves of cordate telosma, like green clouds, add a little interest to the quiet balcony; Cute little arrows point in different directions. Its stamens are pink and yellow, shaking gently in the evening breeze, as if calling us: "Come and play with us!" " "

I like cordate telosma. It stands upright in the wind, spreads its leaves and blooms. Besides, I planted this flower myself, which is the result of my labor. Ah, cordate telosma, your silent dedication inspires me to make continuous progress.

8. Write a research report on one or two plants in the fourth grade. Beautiful Chinese rose Some people like white-ringed lilies, others like sunflowers, and I just like Chinese roses.

Seen from a distance, the Chinese rose looks like a rose. It is half a meter high, and every blooming flower is like a small red sun. There are needles on the branches, and some green leaves of Du are oval.

The branches are as thick as A Zhi's fingers, and the bark is green, like a fairy with a wand. Knife leaves are opposite, as if two good friends will never part.

The colors of the flower heart are gold, white and pink.

There is no bud, just like a brush head. Every flower is particularly bright, and the breeze blows back gently, as if waving to us.

Ah! I like Chinese rose, which makes the streets of the city more beautiful with bright colors.

9. Plant self-introduction composition of 300 words. Hello, everyone. How to write? My name is Yang Xieding, and my father named me. "Yang" is "Yang". "Pick" means pick, and "pick" means pick. "Ding" is a trustworthy "Ding". According to my father, China used to be divided into Kyushu and one continent was the pinnacle, so Jiuding is synonymous with our great motherland. I got this name because my father wants me to be a useful person when I grow up.

At the age of 3, I can tell stories; I entered the first grade at the age of five and a half; At the age of 7, he was awarded the title of "Four Good Boys"; Just last year, when I was 8 years old, I got the first place in my class in the final exam. I love reading and writing, and I am determined to be a writer. I also like football and Go, and I like all the activities that boys like.

This is me, a confident, sunny and enterprising boy. Sichuan

10. When it comes to drafting, people will take it as a symbol of weakness. Indeed, it is so small and weak that even a drop of dew can make its leaves droop. I like grass. It not only heralds spring, but also has admirable vitality.

The grass is not as towering as the big tree, but it stands proudly on the earth. Looking at the big tree and the grass, I naturally feel that the grass is so weak, but other forces are incomparable. Grass is not as colorful as other flowers, so few people really boast about it.

I think, if there were no green grass, the colors in the world would be so monotonous. In spring, the grass comes out of the ground, tender and green, and spreads all over the earth.

Ten thousand trees, one hundred million trees. No one can count how many trees there are. With so many grasses gathered together, it is worthy of the ancient poet's saying that "the wildfire is endless and the spring breeze is high".

All living plants are afraid of storms. Wind and rain can make the flowers disperse, and the flowers are deciduous; Can make the big branches spread out.

But it can do nothing about weak grass. Have you ever seen the flowers and trees look different after the storm, but the grass is displayed safely on the ground? Where there is soil, there is warm sunshine, and there are traces of grass.

It is this ordinary and tender plant that grows silently in the world, so it is not easy for people to find it. Grass is common, but it has strong vitality.

It is this heavy resistance and the choice of nature that gives it a tenacious will. We should not be afraid of resistance, be strong and unyielding in the face of any difficulties and fight against nature.