Autumn leaves fall is a common sight, why do the leaves fall? And why do you fall downward?

Autumn leaves fall is a common sight, why do the leaves fall? And why do you fall downward? About why the leaves fall in autumn.

In fact, the trees themselves, the vegetation has a growth cycle, spring begins to sprout, naturally in the autumn will decline, can not be evergreen, trees and people, after time, after the age will be senescent, the use of greenhouses, I think it can not be changed, unless you are planted in autumn, and then in the spring it will still decay, here is not entirely about the temperature to change the state of life, growth habits, but time has changed all this, just growing trees are like newborn babies, Slowly it will grow over time, and the body will slowly develop, that is, it will slowly become more lush, and eventually develop into an old man, slowly declining. This is the natural growth cycle, if you want to change, you should also be like a scientist, slowly research, waiting for the emergence of new technologies, maybe you can change this imagination.

The simplest of these questions is the laws of nature.

Just like human birth, old age, sickness and death, if you talk about it in detail, it is the natural law of trees, and plants have their own growth cycles and characteristics. Throughout the year, trees sprout, branches and leaves grow, fall in autumn, and dormant in winter. In spring, the weather warms, trees begin to sprout and grow, in order to attract sunlight and air, leaves are the best channel, in summer, the leaves are dense and fully absorb sunlight and air, giving trees sufficient nutrients for growth, in autumn, the weather becomes cooler and colder, in order to enter the dormant period to keep nutrients ready to go, the leaves begin to change color and wither, chlorophyll.

It recedes quickly, so the leaves change color and eventually fall. In winter, the leaves fall and rot on the ground as fertilizer for the tree, providing nutrients for the tree to grow. Cycle after cycle, cycle and repeat, this is the normal phenomenon of nature, and birth, old age, sickness and death is the same thing, there is nothing to entangle, we just follow the laws of survival of nature, and falling leaves are not another kind of beauty.

Because the weather is cold, the leaves fall when the wind blows. Because the earth is attractive, everything high in the sky will fall downward.

This is because with the passage of time and seasons, the work will slowly turn yellow and wither. It will fall when it withers. Falling down is because of gravity.

I think it has something to do with the weather, and the reason why it falls down, it's because of gravity.

Because the trees are about to change seasons, it is normal for mature leaves to fall, and the reason why they fall down is because the earth has a gravitational pull and everything will fall.

Autumn comes, and the leaves on the trees turn yellow and fall down one by one, which is an adaptation to the bad environment.

The reason for this is the creation of dislocations – certain cells at or near the base of the petiole (formerly calcium pectinate, soluble pectin, and pectic acid) are produced as a result of changes in cellular or biochemical properties.

Leaf litter reduces transpiration and allows plants to survive cold and dry seasons.

This habit was developed in the long-term evolution of plants, with short days accelerating the formation of separation and an increase in abscisic acid and ethylene, which can accelerate leaf shedding.

The main reason why the leaves on the tree turn yellow in autumn is that the leaves contain substances such as chlorophyll, lutein and carotene. In spring and summer, chlorophyll is much more abundant in the leaves than other pigments, so the leaves show the green color of chlorophyll and the color of other pigments is not visible.

When the temperature drops in autumn, the light time is shortened, which affects the absorption capacity of the root system and the photosynthesis of leaves, so it cannot meet the growth and development of trees. When the temperature drops and the air is dry, the water in the leaves evaporates quickly, but the ability of the roots to absorb water has been greatly reduced, and the water and nutrients are insufficient.

In order to survive, the tree generates an isolation layer at the junction of the petiole and the leaf stem, and the leaves are cut off from the water **, coupled with the low temperature, the chlorophyll is destroyed, so the lutein begins to be active, which is the reason why the leaves of the tree will turn yellow in autumn.

Autumn leaves turn yellow, which is the growth pattern of the tree. Plants excrete waste products from their bodies through their leaves. A year of growing plants accumulates a lot of waste.

Autumn is coming, and the weather is getting cooler. Plants shed their leaves to expel waste and conserve energy for better growth the following spring.

1. The beautiful autumn has arrived, and the golden leaves have fallen;

2. The silent autumn has arrived, and the withered yellow leaves are slowly falling;

3. The quiet autumn has arrived, and the beautiful leaves have fallen;

Problem solving ideas: Sentence writing is specific, which is equivalent to expanding the sentence, and the minimum requirement for expanding the sentence is one place; You can start with what kind of autumn, what kind of leaves, and what kind of fall.

Writing ideas bai: use simple writing du

style, readers tend to choose zhi simple texts to read rather than meditate on complex expressions. For example, you could use "help" instead of "promote" or "use" instead of "use". Leave complex words to professors and talk to people in simple, easy-to-understand language without making the reader spend a lot of time reading.

The sample text is as follows: In the impression of autumn, there are always many withered yellow leaves. Yellow always gives me a faint sense of sorrow. However, every day when I go to school, I can't help but look at the withered yellow kapok tree.

Under the blowing of the breeze, the leaves swirled lightly, fell, and the endless sorrow gradually spread.

When will this feeling end? Do you want to wait until winter arrives? It's a pity that there are no snowflakes in the sky. The beautiful story will end one day, but the seasons are different, and after the past, the next year will still come as scheduled.

Growing up, I never felt that there was anything wrong with autumn. Spring is rainy, summers are hot, winters are cold, but autumn is cool and not annoying. This year, however, it felt different.

I actually like the rainy spring, perhaps, because the rain is a tear, and after tears, there is no so-called sadness.

I thought about getting a rain out of the rain, but in the end it didn't come true, perhaps, this idea is naïve! And autumn, endless sorrow crept closer, unable to resist, powerless to fight.

The frost is a bit icy, and I have the impression that autumn should be a beautiful season, but I still think that it should be described as flawless and sensitive.

Loneliness and parting.

When walking alone, I will inexplicably think of the loneliness of leaving school.

1. Lush leaves fall scattered and scattered.

2. The golden leaves fall in clusters.

3. The long leaves fall down in an orderly manner.

4. The turquoise leaves fall unhurriedly.

5. The withered leaves fall generously with the sound of the wind.

6. The cold weather made the pretending strong leaf unable to resist, so it had to fall unwillingly.

7. Butterfly-like leaves flutter and fall in the air.

8. Leaves with raindrops fall freely.

9. The golden light of the leaves falls in the sun.

10. The leaf that guards the flower completes its mission and falls happily.

11. The leaves on the big trees fall overwhelmingly.

12. The leaves on the child's hands fell gently.

13. The round leaves fall slowly.

14. The scattered leaves touched the heavy rain and fell vertically.

15. The leaves of the apple tree fell heavily along with the apples.

Flaming red leaves like. Butterfly-like. Fall happily.

The yellowed leaves fell helplessly like butterflies.

Beautiful night view, beautiful video of the city.

The leaves fall like butterflies.

You're a dog, hahahahaha