First, you know what?

1. Why do trees fall in autumn?

The autumn wind has started, the weather is getting colder, the flowers have withered, the grass has withered, and the leaves have fallen from the trees. Why do trees lose their leaves in autumn?

It turns out that when autumn comes, the temperature drops obviously, the rainfall is less, the ability of tree roots to absorb water is also reduced, and the efficiency of photosynthesis is greatly reduced. In order to retain water and nutrients and maintain the life of trees, trees have to lose many leaves.

Another reason why trees shed leaves in autumn is that some cells in leaves become round and separate from each other, which gradually weakens the strength of the connection between leaves and branches. Finally, when the autumn wind blows, the leaves fall.

2. Why do leaves turn red or yellow in autumn?

The leaves are green because there is chlorophyll in them. But in addition to green pigment, there are many pigments in leaves, such as red pigment and yellow pigment, but the quantity is very small. In autumn, the green pigment gradually fades, and the red pigment and yellow pigment are exposed, making the forest golden or fiery red, which is very beautiful.

Second, autumn poems

1, leaves floating 2, leaves falling 3, maple leaves

Autumn is coming, the wind is blowing, the weather is cool, maple leaves, maple leaves,

Autumn has come, and leaves are blown off one by one. Let me ask you,

The branches are shaking like telegrams, and your little hands,

The leaves are fluttering, urging the swallows to return to the south. Why is it so red?

Red leaves are floating like boats, pattering,

Yellow leaves float, providing winter grain for ants. State by state,

Like petals falling. Swallows and ants sing in unison: Welcome Miss Qiu,

Pick up a yellow leaf, thank you kind teacher Qiu. Clap your hands and turn red.

Sew a coat for the doll;

Pick up two yellow leaves,

Sewing gloves for dolls;

Pick up three more red leaves,

Sew a little red riding hood for the doll!

4. Autumn colors. Autumn letter

Millet said: I will write to you in autumn.

"Autumn is yellow." Make writing paper with leaves.

Gao Liang said: Please be a postman.

"Autumn is red."

Cotton said: lazy postman

"Autumn is white." Every place

The pine tree said, throw away the letter.

"Autumn is green."

The land said: several letters fell on the squirrel's head.

"Autumn is colorful." Some letters fell beside the frog.

The goose on the road also took a page home.

In the pond, on the grass.

Autumn letters are everywhere.

The animals hurried to prepare for the winter.

Third, beautiful autumn.

1, it's autumn

Autumn is coming, and the autumn wind makes people feel a little cold. Xiaohong closed the window, put on her autumn clothes and ran to the yard to play. I also saw that the apple tree was covered with big and red apples, and several yellow leaves were falling with the wind and flying like butterflies. The grass looks like a golden carpet. Chrysanthemums are blooming, yellow and white, like fluffy balls. How nice! Two swallows flew out of the house and twittered at Xiaohong, as if to say, "Little master, we are going to the south for the winter. See you next spring! " "

Autumn is really a happy season!

2. Autumn leaves

The autumn wind is rustling, and Kingdee is flying all over the courtyard.

Golden butterfly! Who are you dancing for? Flowers have lost their smiles and grass has lost its luster. Oh, I see. What are you doing for the flashing daisies in the garden?

I don't know when you landed gently on my bright red sweater. Do you treat me like a flower, too?

You told me quietly that people are changed by green butterflies. In spring and summer, people fall on branches in droves. Spring gives people new green and summer gives people shade. When autumn comes, you put on golden clothes and fly around looking for your beloved friends.

Golden butterfly, would you like to make friends with me? Come on! Fly into my textbook and accompany me into the bright classroom.

Fourth, the mystery of autumn leaves.

Looking for new ideas from fallen leaves

One day, my classmates and I went to the park to play. Because many games are tired and boring, everyone starts to talk about playing something new. A gust of wind blew the dead leaves off the tree. I had a brainwave and suggested, "Let's make puzzles out of leaves and see whose puzzles are innovative." Everyone raised their hands in favor.

I want to shoot animals, a king kong and a tiger. I first took two big leaves as the corpses of two animals, and then I chose four slender leaves to cheat. When I picked up the last leaf, someone shouted, "Do you want to destroy my graphics?" Ah! My classmates' unfinished works look like a pile of fallen leaves, no wonder I took them by mistake. After apologizing, I found other leaves and ate the rest in two or three times.

After that, I went to visit other people's works, and everyone tried their best to spell out novel tricks. Among them, what I appreciate most is Wu Yiwei's Rabbit Playing the Piano. When everyone is ready, we will observe and compare with each other. Everyone and I have the same opinion. Everyone thought "Rabbit Playing the Piano" was the best, and Wu Yiwei also smiled proudly. But I am a little angry, because some people say that my King Kong is like a butterfly, and I really have no eyes!

But the leaf puzzle is really a good idea, a good idea, it changes the game. You might as well give it a try.

Verb (abbreviation of verb) appreciation of American literature

fallen leaves

Summer has passed, and Mother Qiu is busy putting a golden coat on the tree. Looking up, it is like a vast ocean of gold. When the autumn wind sweeps, leaves fall one after another, some dance like butterflies, some spread their wings like orioles, and some spin lightly like dancers. The ground is covered with fallen leaves, like a thick golden blanket.

I think autumn is more beautiful than spring!

Look, another big leaf is falling down. I rushed over and reached for it. Ha, that blade is like a golden boat. Maybe it fell because it wanted to throw itself into the arms of the river. So I gently put it into the river. The river is ringing, as if clapping. The boat whirled briskly as if to say goodbye to me. Then, it began its interesting voyage.

At this moment, a peach-shaped leaf fell in front of me. I held it in my hand and thought, "Maybe the Monkey King accidentally knocked off Momo while eating flat peaches." As soon as it fell to the ground, it became a small leaf. "I put it under my nose and smelled it, as if it really smelled of peaches!

I was daydreaming when another willow leaf quietly landed on my feet. I picked it up and saw, ah, it's still green! I can't help secretly guessing: "It probably saw her sister fall and wanted to play on the ground, so she couldn't help jumping off the treetops." As I thought about it, I carefully turned it into a leaf whistle and blew it "qu qu". Sounds like a shepherd's melodious flute!

There are more and more fallen leaves on the ground, and I don't know which one to pick up. Simply find a rope to string the leaves together and wear them on your head. Ha, interestingly, I became a "prince" wearing a golden crown.

Five, a little pen practice

Autumn is coming, and chrysanthemums are in bloom. There are red, yellow, purple and white. How beautiful!

Autumn has come and the fruit is ripe. Pears are in Huang Chengcheng, apples are red and grapes are shining. A cool breeze blew, and the fruit nodded, emitting an attractive fragrance.

Sixth, fairy tales in autumn

1, three fallen leaves

Autumn is coming, and there are three red maple leaves at the foot of mother tree. They got together and whispered to each other.

A fallen leaf said, "I want to make a beautiful little ferry in the stream."

A fallen leaf said, "I also want to go to the stream and make a red umbrella so that the little fish can play with me."

The third fallen leaf said, "I haven't decided yet." What can I do? " At this time, a breeze blew and three fallen leaves fell in the stream. It happened that a little ant was trying to cross the stream. The first fallen leaf really became a ferry. A small fish wagged its tail and swam to the edge of the second fallen leaf, swimming around with it. The fish said, "Haha, I found a beautiful umbrella."

The third fallen leaf is in a hurry. It didn't know what to do, and it was so anxious that it floated on the water.

A blue dragonfly is tired of flying. It perches on the fallen leaves in the stream. This fallen leaf is happy. It said happily, "I didn't expect I was a little red bench!" " "

2. Travel Notes of Red Leaves

Several red leaves swayed in the wind and landed on the steps in the mountains. Autumn wind blows, and red leaves sing, dance and whisper with the wind.

The red leaves jumped down the steps step by step. Mother Bu reminded everyone: "Don't jump down, there is a stream below. Falling is not fun! " On hearing the music, Hongye said, "Haha, this is exactly what we are looking forward to. We will become a group of red boats and let Sister Xi take us on a trip! " "

Another autumn wind blew, and the red leaves scrambled to jump into the stream. "goodbye! Grandpa Qiu Feng, stepmother! " The red leaves cheered happily.

Seven, a little brushwork practice

autumn

Autumn is coming, and chrysanthemums are in bloom. There are red, yellow, purple and white. How beautiful!

Autumn has come and the fruit is ripe. Pears are in Huang Chengcheng, apples are red and grapes are shining. A cool breeze blew, and the fruit nodded, emitting an attractive fragrance.