Why don t most leaves need green light for photosynthesis?

The high school textbook Biology Books 1 and 3 are very detailed.

You can go to the library and look at it.

There are 2 main types of chlorophyll.

1 is very rare, which converts light energy into electricity, and is very little chlorophyll a. Just like the photoelectric effect, it needs a short wavelength (the energy of the short wavelength is high), so the blue-violet light with the shortest wavelength is needed.

Others, like most chlorophyll a, and all chlorophyll b and carrot a, b are only responsible for transmitting electrical signals, and this activity requires a certain temperature to reach the active temperature of the enzyme. In addition to the heat generated by respiration, it also absorbs heat from the outside, so the red-orange light with the longest wavelength (the thermal effect is strong at the long wavelength) is absorbed.

And the green light in the middle, of course, is useless to pull! (Actually, it is also absorbed, but it can be ignored, to ask why, look at Darwin's theory of evolution).

So the leaves don't need green light.

I wrote it all from books.

No plagiarism!

In layman's terms, it is accurate to say that leaves do not need green light, but reflect green light.

You know that the leaves are green, and that is due to the reflection of green light.

Chloroplasts absorb red-orange and blue-violet light the most, and green light absorbs almost nothing.

This is related to the photoreaction phase reaction of photosynthesis.

The high school textbook Biology Books 1 and 3 are very detailed.

If you are not a high school student, it is enough to know the above.

Chloroplasts contain pigments such as chlorophyll carotenoids that absorb different amounts of light, but none of them absorb green light.

Chloroplasts absorb red-orange and blue-violet light the most, and green light absorbs almost nothing.

Of course, because only green plants contain chloroplasts, chloroplasts, which help plants to photosynthesize.

The green color in green plants refers to the presence of chloroplasts, which contains chlorophyll, so they are green. In fact, photosynthetic pigments are not only chlorophyll, but also chlorophyll a, b, c, d (green), carotene (orange yellow), lutein (yellow), phycoerythrin, phycocyanin, bacterial chlorophyll, and so on. Plants with red leaves are just other pigments that overshadow chlorophyll, and they are actually considered green plants.

Photosynthetic bacteria, some species of flagellates in protozoa can also carry out photosynthesis.

No, non-green plants can also photosynthesize. 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. green plants, which photosynthesize through chloroplasts; Non-green plants use chlorophyll, lutein, and carotenoids for photosynthesis.

Neither lutein nor carotenoids are green.

Just because plants aren't green doesn't mean they don't have chlorophyll, but that other pigments are more present than chlorophyll. Some plants that don't look green, such as purple-leaved sorrel, are so rich in anthocyanins that they overshadow the chlorophyll, hence the purple color. If you look closely, you'll probably see a faint green in its uneven purple color.

Anthocyanins protect plants from bright light. Under normal light, some non-green leaves have no worse ability to obtain light energy than green leaves. However, when the light is low, their photosynthetic rate is not as good as that of green leaves.

Hello, the reason why the leaves are green is because the leaves contain chlorophyll, which mainly absorbs visible light.

but does not absorb green light, so green light can penetrate chlorophyll or be reflected out. The reason why the leaves of the leaves are green is mainly due to the small green grains in the mesophyll cells of green plants, which are chloroplasts, and chloroplasts contain chlorophyll, carotene, and lutein.

etc., and chlorophyll has a very large advantage, which can mask other pigments. The color of the leaves is determined by the chlorophyll, anthocyanins, lutein, and carotenoids in the leaves, and most of the leaves have a lot of chlorophyll, especially in spring, so they are green. The first plants on Earth lived in the oceans and were photosynthesized.

It is a primitive bacterium that works in the process. Because there is very little light that can penetrate the ocean, in order for this plant to photosynthesize, it must be able to absorb all colors of light to make its own food. As a result, the plant has a very dark color, which is reminiscent of the color of the kelp we eat now.

Later, crustal movements turned the ocean into land, and these plants had to adapt to this environmental change. Now, they live in a place with plenty of light, and as they used to, the light that absorbs all colors is easily burned by so much light. Therefore, most of the terrestrial plants, due to the abundant light, the green light is not absorbed and used at all, but is reflected out.

Our eyes receive this light, so the plants we see are green. In general, the green color of the leaves has a lot to do with the chlorophyll in its body. Hope mine can help you.

However, the formation of chlorophyll is inseparable from light, which promotes the formation of chlorophyll molecules.

Note that lighting and photosynthesis are two different concepts.

Chlorophyll: The main pigment in plants that carry out photosynthesis.

All plants need to photosynthesize in order to grow, develop and bloom. The solar greenhouse is a human factor, which creates a unique microclimate for vegetable microorganisms to protect the ecological environment, and pursues perfect high returns and economic benefits. Integrate into the living standards of the people, and continue to improve the requirements for food.

The effect of light meeting for vegetables in the greenhouse is carried out by digesting and absorbing water from rhizomes and fertilizer, and the operation of nutrients is also carried out with water as the substance. Balance water supply and drainage, the nutrients are supplied in a balanced manner, the nutrients are dissolved in water first, and the rhizomes are digested and absorbed.

CO2 is one of the most important raw materials for photosynthesis, and it is called the grain bank of greenhouse vegetables. The sunlight in the sunshade is poor, the ambient humidity is high, and the cyclone exchange speed is relatively slow, and carbon dioxide can not be filled from the air at will, especially in the cold days, the requirements of greenhouse vegetables for CO2 gas fertilizer can not be met, and at the same time, it is highlighted that the concentration and size of carbon dioxide determines how much photosynthesis is. In turn, green plants cause a variety of diseases, as well as germs and insect pests.

This kind of photosynthetic products are caused by water, fertilizer, carbon dioxide gas break, natural light energy according to the chlorophyll cell chemical changes, this kind of chemical is called sugar, is the culture medium of plant growth, with a variety of components such as water, body fat, sugar, tapioca starch, various carbohydrates (proteins), vitamins, etc.

Therefore, the lack of carbon dioxide is a key factor in the high yield of greenhouse vegetables. If the concentration of carbon dioxide in greenhouse air reaches 800-1000 ppm due to human factors, can it increase vegetable yields by 20%?

Can an air CO2 concentration of 300ppm-500ppm increase vegetable yield by 20%? If it exceeds 40%, the drought resistance of vegetable seedlings will be further improved, and all kinds of pests and diseases will be alleviated. It not only saves chemical fertilizers, but also improves the production and greatly improves the quality, especially the early production increase, which just catches up with the 2-year pass, and the first position of the vegetable is missing.

The concentration of carbon dioxide in the greenhouse is the largest before sunrise, but it is only 100? If 200 ppm is less than the air level, the carbon dioxide concentration in the greenhouse air will drop to 70 within an hour of sunrise? The CO2 requirement of 90ppm vegetable seedlings is in a state of extreme hunger, and after 2 hours of ventilation, can it recover to 200?

However, sometimes the temperature difference between the inside and outside of the greenhouse is too large and cannot be ventilated (the temperature of the greenhouse is reduced after natural ventilation, which is not conducive to the growth and development of vegetables).

The results show that carbon dioxide can be used, which is important for the high quality and high production of vegetables in solar greenhouses.

That's why green plants photosynthesize, and what questions do you have about it?

The reason why photosynthesis can be carried out depends on the leaves of the plant. In addition, chloroplasts occur where photosynthesis takes place, and plants can use light energy to convert carbon dioxide and water into organic matter, and can release oxygen, so they can photosynthesize.

This is because green plants generally contain chloroplasts, and the main photosynthesis is the leaves, which can also convert light energy into energy through chloroplasts and store them in the body of plants.

Because green plants use chloroplasts to convert carbon dioxide and water into organic matter that stores energy, the oxygen process released at this time is called photosynthesis.

First, let's take a look at the cross-section of spinach leaves and the characteristics of the lower epidermal tissue observed by the students in the exploration of photosynthesis laboratory class. I have selected representative works, and I hope that the next exhibition here will have yours:

First, spinach leaves cut cross-cut (10x40).

Producer: Everest).

Producer: Wu Haotian).

Second, micrograph of the lower epidermis of spinach leaves (10x40).

Producer: Ban Haoyang).

Producer: Ding Xuancheng).

Producer: Guo Jinen).

The upper and lower epidermal tissues of spinach leaves have different characteristics, the top is neat like a fence, which can accommodate more mesophyll cells, and the corresponding number of chloroplasts is also large, which is more suitable for direct contact with sunlight and better photosynthesis. The cells in the lower epidermis are loosely arranged, and people give the title "sponge tissue" - people really like it as the name suggests - the sponge tissue fluid does not disappoint people's expectations, and assumes its role as a channel for air channeling, and the pores are also located on the lower epidermis.

Let's take a look at the characteristics of the stomata structure. The stomata are the gateway for the leaf to exchange gases with the outside environment, a bit like our mouth, which can be opened to inhale or exhale air.

Pictured: The stomata on the leaf epidermis are like human lips, thanks to Orange. (Photo: Lotus, Photo: Duan Yupei).

Chlorophyll: The main pigment in plants that carry out photosynthesis.

Chlorophyll has the effect of absorption, transfer and conversion of light energy, which is essential for photosynthesis. So the first one is right.

The production of starch is a dark reaction in the chloroplast matrix, there is no chlorophyll, so the second mistake is explained as follows.

The process of photosynthesis:1Photoreaction stage The chemical reaction in the first stage of photosynthesis must have light energy to proceed, and this stage is called the photoreaction stage.

The chemical reaction in the photoreaction stage is carried out on the thylakoids within the chloroplast. Dark Reaction Phase The chemical reaction in the second phase of photosynthesis can be carried out without light energy, and this stage is called the dark reaction phase. The chemical reactions in the dark reaction phase are carried out in the matrix within the chloroplast.

The light reaction stage and the dark reaction stage are a whole, and in the process of photosynthesis, the two are closely related and indispensable.

Chlorophyll plays an important role in the process of photosynthesis, it can absorb light energy to complete the conversion of light energy, without chlorophyll is not able to carry out photosynthesis. Some algae can also replace chlorophyll with other pigments, but this is rare.

Photosynthesis, that is, photoenergy synthesis, is a biochemical process in which plants, algae, and certain bacteria, under the irradiation of visible light, undergo light reactions and dark reactions, using photosynthetic pigments, to convert carbon dioxide (or hydrogen sulfide) and water into organic matter, and release oxygen (or hydrogen).

Photosynthesis is the sum of a series of complex metabolic anti-imitation models, and preparation is the basis for the survival of the biological world, and it is also an important medium for the earth's carbon and oxygen cycle.

All green plants need to photosynthesize in order to develop, grow, blossom and bear fruit, and provide abundant food for humans. The solar greenhouse is artificially created a specific ecological environment microclimate for vegetable organisms, with the goal of high yield and high efficiency. To meet people's living standards and continuously increase the demand for food.

The light meeting of greenhouse vegetables is carried out by the root system to absorb water, fertilizer is used as raw materials, and the operation of nutrients is also carried out with water as the medium. Balanced water supply, balanced supply of various nutrients, nutrients must first be dissolved by water, so that the root system can absorb and utilize.

Carbon dioxide is one of the most important raw materials for photosynthesis of green plants, which is irreplaceable by any substance, and is called the grain of greenhouse vegetables. Sunlight greenhouse light is weak, humidity is large, air flow exchange is slow, carbon dioxide can not be arbitrarily supplemented from the atmosphere, especially in the cold days, greenhouse vegetables can not meet the demand for carbon dioxide gas fertilizer, and for the outstanding, the concentration of carbon dioxide determines the amount of photosynthesis. So the plant produces various diseases, as well as fungal and insect pests.

Photosynthetic products are produced by the chemical reaction of chlorophyll cells of water, fertilizer, carbon dioxide gas, and solar photothermal energy, and the new compound is called carbohydrate, which is the nutrient solution for plant growth, containing a variety of components such as water, fat, sugar, starch, various amino acids (proteins), vitamins, etc.

Therefore, the lack of carbon dioxide is an important limiting factor for the increase of greenhouse vegetable production. It has been determined that the concentration of carbon dioxide in the atmosphere is 300ppm-500ppm, which is not the optimal concentration for photosynthesis, if the concentration of carbon dioxide in the greenhouse air can be artificially increased to 800-1000ppm, the vegetable yield can be increased by 20%.

More than 40%, the ability of vegetable seedlings to resist stress is greatly improved, and various diseases and insect pests are bound to be reduced. It not only saves pesticides, but also improves the yield, significantly improves the quality, especially can improve the early output, just in time for the two years off, the first period of vegetable shortage.

The concentration of carbon dioxide in greenhouses is the highest before sunrise, but it is only 100°200ppm is below atmospheric level, and the speed of carbon dioxide in the greenhouse air drops to 70% within an hour of sunriseThe CO2 demand for 90ppm vegetable seedlings is in a very hungry state, and it can only rise to 200% after two hours of ventilation

250ppm, but sometimes the temperature difference between the inside and outside of the greenhouse is too large, and it can not be ventilated (the temperature of the shed is reduced after ventilation, which is not conducive to the growth of vegetable seedlings).

Therefore, the application of carbon dioxide growth agent is the key to achieving high quality and high yield of vegetables in solar greenhouses.