Can leaves turn green when they are yellow? Why do leaves turn yellow

The leaves are green because of the chlorophyll in the leaves.

However, in addition to green pigment, there are many pigments such as red pigment and yellow pigment in the leaves, but the amount is very small. In autumn, the green pigment slowly fades, and the red pigment and yellow pigment are revealed, making the forest a golden yellow or a fiery red, which is very beautiful.

When autumn arrives, the leaves of the trees in the mountains turn into beautiful colors, why is that?

It used to work hard in the summer, but when the weather cooled down, it stopped working. The nutrients produced by the leaves do not reach the branches and trunks, but settle in the leaves. The chlorophyll of the leaves is also destroyed, and it mixes with the nutrients left in the leaves or the withered brown color, which becomes a variety of beautiful colors.

Why do the green leaves change color in autumn?

All leaves contain green chlorophyll, which is used by trees to capture light energy and store it in the form of chemicals such as sugar with the help of other substances in the leaves. In addition to chlorophyll, many leaves contain other pigments such as yellow, orange and red. Although these pigments cannot photosynthesize like chlorophyll.

But some of them are able to transfer captured light energy to chlorophyll. 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 the other pigments is not visible.

When autumn arrives, the days are shortened and the nights are lengthened, which causes the trees to begin to lose their leaves. Before the leaves fall, trees no longer produce large amounts of chlorophyll as they do in spring and summer, and existing pigments, such as chlorophyll, gradually break down. In this way, as the chlorophyll content gradually decreases, the colors of other pigments will gradually appear on the leaf surface, so that the leaves will show yellow, red and other colors.

The leaves are yellow because chlorophyll is naturally explained, unless artificially colored.

It cannot be restored.

There are two reasons why leaves turn yellow: one is the natural cause of seasonal variation; The second is because of the plant's own pathological factors.

1. Natural reasons for seasonal changes: When the chlorophyll in the leaves decreases in autumn and winter, the carotene, lutein and anthocyanins in the leaves will be highlighted, and these elements will make the leaves show yellow or yellow color.

2. The plant's own disease: When the roots of the plant decay, it will not be able to provide nutrients to the leaves, so the chlorophyll cells in the leaves will become less, and the energy conversion will be slowly inable, and the leaves will turn yellow.

The reason why the leaves turn yellow in autumn is that the roots and stems of the trees no longer deliver nutrients and water to the leaves in autumn.

The reason why the leaves turn yellow in autumn is that in autumn, the roots and stems of the trees no longer deliver nutrients and water to the leaves, and will break down the chlorophyll in the leaves, and transport nutrients to the roots of the tree as nutrients for the winter. The leaves also contain lutein, lutein, etc., and the leaves have no chlorophyll and nutrients, so only chlorophyll and lutein are left, so the leaves will show a yellow or red state.

Reasons for falling leaves in autumn

The fall of leaves is generally divided into two situations, one is that the leaves are already dead. Plants, like animals, are born, old, sick and die, and the other is a man-made "accident", such as a passerby picking off a leaf. Dead leaves have no physiological function and have to fall to dust.

The other is caused by the environment, and there are also two reasons for this: man-made and natural. In short, man-made is something man-made, such as a factory next to a tree or a nuclear power plant accident.

Leaves will choose to "actively fall in the face of adversity" to protect themselves. Natural environmental reasons are the most common situation, and the temperature drops sharply in autumn and winter, so it is impossible to carry out physiological activities, so it is necessary to hibernate people.

As the temperature drops, the stems have thickened bark, the roots are buried under the soil, and the thin leaves are left to fight alone. The impending cold also made these leaves, which were originally born for photosynthesis, at a loss. The wide leaf surface receives more sunlight, but it is less resistant to cold weather and is at risk of frostbite when the temperature is below zero.

The drop in temperature and the decrease in precipitation have directly made the process of not simply absorbing water "worse". There are many stomata on the leaves, and the tree loses a lot of water as it breathes. The leaves had no choice but to abandon them.

Leaves are an important part of the tree's photosynthesis and nutrient production, and the leaves turn yellow because the chlorophyll is destroyed, leaving only lutein. In spring and summer, when the weather is warm, the trees are very nutritious, and they produce a lot of chlorophyll, so the leaves are green. When the weather becomes colder, the trees are undernutrient, the chlorophyll slowly decreases, and the anthocyanins and lutein increase, and the leaves turn red or yellow.

When the weather is colder, the anthocyanins and lutein in the leaves will slowly be broken down, and the leaves will turn a deep brown. The photosynthesis of leaves is done through chloroplasts, which absorb carbon dioxide, release oxygen, and provide shelter and food for the flora and fauna of the forest.

Introduction to photosynthesis

Photosynthesis is usually the process by which green plants (including algae) absorb light energy and synthesize carbon dioxide and water into energetic organic matter while releasing oxygen. It mainly includes two stages: light reaction and dark reaction, which involves important reaction steps such as light absorption, electron transfer, photosynthetic phosphorylation, and carbon assimilation, which is of great significance for realizing the energy conversion in nature and maintaining the carbon-oxygen balance of the atmosphere.

Eukaryotic algae, such as red algae, green algae, brown algae, etc., have chloroplasts like higher plants and are also capable of oxygen-producing photosynthesis. Light is absorbed by chlorophyll, and many algae have other different pigments in their chloroplasts, giving them different colors.

The color of the leaves is related to the chemicals contained in the leaves, and its tissues contain a substance called chlorophyll, which is green when there is enough chlorophyll, and yellow when the chlorophyll is insufficient. The amount of chlorophyll determines the color of the leaves, which is the reason why the leaves are different in the four seasons, in summer, the daytime is longer, the temperature is higher, and the sufficient light makes the leaves produce chlorophyll very quickly, therefore, a large amount of chlorophyll makes the leaves appear green. In autumn, the daylight hours are gradually shortened, the temperature also drops, and the decrease in light makes the photosynthesis of the leaves weaken, so the leaves produce very little chlorophyll under photosynthesis, and the nutrients will be transported to the trunk and roots through the branches to store in preparation for wintering.

As a result, the decrease in chlorophyll in the leaves causes the leaves to turn yellow, and the nutrients produced by the leaves are transported to the roots through the branches, and after storage, the leaves gradually wither and finally fall off.

Photosynthesis produces chlorophyll: when the spring flowers bloom in the second year, everything recovers, and the big tree begins to grow again, and a small bud emerges on the branch, at this time, nutrients are transported from the roots and trunk to the bud, and the leaves slowly grow out, and the slowly growing leaves begin to photosynthesize, producing chlorophyll again, making the leaves appear green, and making the tree appear vibrant.

What excuse do we have for not working hard and growing? Seeing the changes of the trees throughout the year makes us appreciate the passage of time, cherish every day, every second, and work hard for life and work. Don't choose comfort when the spring flowers are blooming, and wait until the big trees lose their leaves and then regret that the year was wasted.

The big rulers are working hard, what excuse do we have not to work hard and grow?