Amazing knowledge

Chapter 9 Plant Wonders Collection: Flowers, Plants and Trees Are Crazy

* Can cacti really protect against radiation?

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Many office workers who sit in front of the computer for a long time will put a pot of cactus next to the desk, which is called "radiation protection".But this thorny guy is really what everyone thinks, can he lead everyone to open up a broad road from the radiation?

The ideal is plump, but the reality is always skinny.The cactus, which has been dubbed the "anti-radiation artifact", is also helpless against computer radiation, and it has no protective effect at all.Moreover, cacti not only have no resistance to radiation, but may also be poisoned by radiation.

Although cacti are strong in the desert and a symbol of super vitality, they can indeed resist radiation, but this radiation is solar radiation, not electromagnetic radiation.Cactus lives in the desert and is exposed to strong solar radiation for a long time. In order to adapt to the environment, it can indeed resist part of the solar radiation and prevent itself from being burned by the sun.

But the cactus can only control the solar radiation, and it is powerless in front of the computer radiation.

Computer radiation includes infrared rays, ultraviolet rays, electromagnetic radiation, electrostatic electric fields, low-energy X-rays and other electromagnetic waves and rays, while cactus can only absorb a very small part. Because of this feature, cactus is equipped with a high degree of "radiation protection". The hat, placed in front of the computer all day, was slowly burned by the computer radiation, and finally even shriveled and died.

In fact, for human beings, the radiation brought by computer appliances is a piece of cake, which is completely within the range that the human body can bear, so there is no need to worry about it at all, but for small cactus, it is like a chronic poison. It will kill it bit by bit.

If you really put a cactus in front of your computer, for the sake of the cactus, you should quickly change its place!Cacti can't stop this radiation.

The final word: There are electromagnetic waves almost everywhere in our lives, but these electromagnetic waves do not cause harm to people.However, if the cactus is exposed to electromagnetic waves for a long time, it is likely to be damaged. Electromagnetic waves are not comparable to solar radiation, and cactus cannot "protect against electromagnetic radiation".

* Which tree is not afraid of fire?
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As the saying goes, "True gold is not afraid of fire". Everyone knows that gold is not afraid of fire, but if you talk about wood, you may not believe it. But there are such logs in the world. What are these trees that are not afraid of fire? what?

Ordinary wood will only be burned when it sees a fire, but there are people outside of people, and trees outside trees, and there are quite a lot of trees that are not afraid of fire.

First of all, the Zike tree in Africa is one of the representatives.The Zike tree itself grows very differently. Small nodules like steamed buns are clustered and hidden among the branches of the Zike tree. The surface of these small nodules is full of net-like holes, and the small holes are filled with transparent liquid. .These small nodular buds generally grow together with the Zike tree honestly, and usually have no major effect.But once there is a flame, it's time for the little buds to show their talents.

If the bracts feel a fire around them, they will immediately spray liquid from the small holes. These liquids are rich in carbon tetrachloride. Carbon tetrachloride is just like carbon dioxide. It is the nemesis of fire. Replaced by carbon tetrachloride, the fire will lose its ability to dominate, and finally it can only die down.

There is also a tree that can defy fire, that is, the coral tree that grows in the south of our country. Its leaves are difficult to be burned by fire.Under normal circumstances, once the leaves meet the fire, they will burn more and more intensely, because the leaves contain a certain amount of oil, and the fire will naturally become more and more fierce when it meets the oil.However, because the leaves of coral trees lack oil, ordinary fires cannot light them.

In addition to Zike trees and coral trees, there are many trees that are not afraid of fire, such as sea pine with hard wood and strong heat dissipation ability, water bottle tree with strong water storage capacity, etc. When the fire reaches these trees, it is doomed To lose the prestige of the past.

The final word: the world is full of wonders, and the trees that are not afraid of fire are far more than the ones we mentioned.

*Do figs have flowers?
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It grows so big and has eaten so many figs, but it seems that it has never seen a fig flower, so it is not surprising that it has such a name.So, is this fig really flowerless?

The scientific way of saying it should be that figs also bloom, but the flowers bloom in a relatively hidden way, and ordinary people can't notice that's all!The fruit of the fig is an eye-catching dark purple, but its flowers are much more low-key, a faint pink, and they are very deeply hidden.

It is not difficult to find the flowers of figs, as long as you look down the main axis of the fig, you will definitely see them.The flowers of figs are all hidden in a small bag, because figs grow downwards, and the flowers are hidden in fleshy balls. As long as you cut these balls, you can see the nests together of fig blossoms.

Although the flower of the fig is hidden, it has a fragrance.Because figs want to reproduce, they also rely on insects to help pollinate them.The flowers are so secretive that if there is no scent to attract insects, who will pollinate them?However, it takes a little effort for insects to pollinate figs. They have to crawl into the flowers through the gaps at the top of the fleshy hollow balls to pollinate the male and female flowers.

It's not that the fig has no flowers, it's just that it is shy and hides in its own small house for fear of being seen by others, which makes people mistakenly think that it has no flowers.

The final word: No matter what kind of plant it is, there must be flowers before fruits. "Flowering and fruiting" is a sequence, and figs are no exception.

*Is it true that the iron tree blooms once in a thousand years?

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The cycad has always been known as the "giant panda in the plant world". It is very rare for the cycad to bloom, and it is even said that the cycad blooms only once in a thousand years.Is it really so rare for this iron tree to bloom?

The answer is No!Although it is rare for iron trees to bloom, it is definitely not possible to see them only once in a thousand years.The reason why the iron tree blooms so rarely is not that it is unwilling to bloom, but because the climate and environment are not suitable, and it can't bloom if it wants to.

Iron trees originally lived in the tropics, and the humid and hot climate in the tropics is suitable for its growth.Let alone once every thousand years in the tropics, it is no problem to let the cycads bloom every year.

And once it was brought to the north, the sudden change of environment made the cycads very uncomfortable. It used to have warm sunshine all year round, but now it only feels a little tropical in summer.It is not easy for cycads to survive in the temperate zone, and it is really difficult for them to bloom.

Iron trees are still very down-to-earth in the tropics, and it is very common to bloom every year after the age of 10.It's just that in the arid and cold north, the cycads have a small temper and claim to "open once in a thousand years".

In fact, as long as the temperature is suitable and the sun is sufficient, allowing the cycads to enjoy the temperature and sunshine that are unique to the tropics, the cycads may be able to bloom for face.

The final word: cycads are tropical plants, if they are planted in temperate regions, the "unsuitable" cycads will naturally bloom less.

*Why does evening primrose smell fragrant at night?
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It is said that the bright spring is the time when a hundred flowers compete for splendor, but the cold evening primrose seems to disdain to be with them, and only quietly reveals its fragrance in the dead of night.Why is this evening scent so non-mainstream, insisting on doing the opposite of everyone?
In fact, Ye Laixiang really can't be blamed for this, she also acted helplessly, who made Ye Laixiang's "matchmaker" only come and go at night!

Flowers generally rely on insects to pollinate their offspring. They cannot move and can only rely on flying insects to help them pollinate and reproduce.If a flower wants insects to help itself, it must first attract the idea of ​​insects. How to attract insects?Of course by the fragrance of the flowers and their bright colors!In order for the "matchmaker" to notice themselves, the flowers must of course bloom beautifully and release a charming fragrance.

But the native home of Tuberose is in the hot tropics, and the moths that help pollinate Tuberose are afraid of strong light and hot temperatures during the day, so they generally move at night.So at night, tuberose will desperately release its fragrance, hoping to attract the attention of moths and let them help them pollinate.

Another point is that the petals of evening primrose are also somewhat different from ordinary flowers.Tuberose emits aroma through the pores on the petals, but these pores will only expand when the air humidity is high, and the volatile oil in the tuberose petals can send out a more intense aroma.

It's not that Ye Laixiang wants to be non-mainstream, but the matchmaker is following the niche route, so Ye Laixiang can only change her style accordingly, becoming enchanting in the dark.

The final word: the reason why tuberose smells fragrant at night is because their aroma is originally released to attract moths, and moths basically move at night, so tuberose also moves the time of releasing fragrance to night .

* Why does the lotus root connect?

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Break any vegetable, flower or other plant at random, and it will definitely be broken into two properly, without muddy water at all, but once you encounter lotus root, don't think so clean and neat, even if the lotus root is broken into several pieces, the silk is still connected. together, why?
If you want to find out why the silk is still connected when the lotus root is broken, the first thing you need to understand is the structure of the plant.The growth of plants is inseparable from the nourishment of water, but plants have neither hands nor feet, so how do they transport water?
There are tissues inside plants that transport water and nutrients, and the tubes are the ones that transport water.These ducts are generally hollow and extend to various parts of the plants to deliver sufficient water in time for their growth.

No matter what kind of plant it is, there are ducts that transport water in the body. Some of these ducts are thickened in appropriate places to match the environment in which the plant grows.However, the thickening parts of each plant are different, so the shapes of the plant vessels are also different. Some vessels are like steps, some are like rings, and some are in a divergent network. The ducts of the lotus root are even more peculiar, they are helical, and these ducts look like springs under a microscope.

When we broke off the lotus root, the main body of the lotus root was disconnected, but these conduits were like stretched springs, and did not break immediately, but turned into "filaments" that adhered one by one.

In fact, it is not only the lotus root that has such "broken lotus root" tissue cells. There are many more spiral vessels in the lotus stem than in the lotus root. If you break the lotus stem, you can clearly see a row of cute little "green lanterns" Neatly connected in the middle of the broken lotus stem.

The final word: Plants rely on vessels to transport water, but different plants have different vessels, and different structures lead to these plants showing a variety of characteristics.The reason why the lotus root is "broken and connected" is also because of its unique spiral conduit.

*France doesn't actually have "Sycamores", is it true?

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The French plane tree is the most common street tree in China. Looking at the name, you will definitely think that this tree is a plane tree from France, but does France really have this?
In fact, France is not the origin of this street tree, and this tree is not a real plane tree.The "French sycamore" we call is actually a two-ball sycamore, a new species born after the British crossed the three-ball sycamore native to China and the North American sycamore, whether it is the now popular two-ball sycamore, or Its "father and mother" have nothing to do with France or Indus.

The reason why the name "French Indus" is so widely spread is that it has something to do with France.In modern China, the great powers divided the concessions in Shanghai one after another, and France also participated in it, dividing its own concessions in Xujiahui District and Huangpu District.

The French chose sycamore as a street tree and planted it in large quantities in the French Concession.Although "Sycamore" is very common now, at that time, street trees were generally willows and locust trees, which were still very rare.The Chinese found that the leaves of this tree are somewhat similar to the leaves of the sycamore tree, and this tree was brought over by the French for planting, so the name "French sycamore" was named after that.

Today, sycamores are the most famous street trees in the world. They are very resistant to pollution and are not easy to cause pests. my country also uses sycamores as the main force of urban greening in large areas.

The final word: Although the sycamore has nothing to do with France or the sycamore, the name has been deeply rooted in everyone's minds. There are sycamores in London's "Seven Wonders of Nature".

*Why are black flowers so rare?

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Every time I describe flowers, most of them are "colorful", "colorful" and "colorful". The flowers are bright and beautiful, and the colors are also different, but it seems that I have never seen black flowers. What's going on?
So far, a total of 8 kinds of black flowers have been discovered in the world. In fact, strictly speaking, these 8 kinds are not really "black", because they are just dark purple, and the chroma is so full that it is close to black. They are not really "black". of black.Black flowers are so rare. In the final analysis, there are three reasons:
First, the color of flowers is actually composed of chlorophyll, anthocyanin and anthocyanin contained in flowers combined with different metal elements.But no matter what color they can make, they just can't do anything about black, so black flowers are very rare.

Second, flowers themselves cannot move, but if they want to reproduce, they must be pollinated, and this work has to be done by insects.But those brightly colored flowers attract the attention of insects more, and black flowers are really unattractive to insects.Without insect pollination, flowers cannot bear fruit and reproduce, so even if there are black flowers, they will be eliminated due to the neglect of insects.

Third, the flowers grow in open fields, which means they are exposed to the sun's rays.Our eyes can see colors because of the light reflected from objects.The reason why we can see red and yellow flowers is because they reflect the red and yellow light in the sunlight, and these two kinds of light are the ones that carry the most heat in natural sunlight.The light with the highest heat is reflected away, and the heat that the flowers have to bear is naturally less. For delicate flowers, a little more heat may cause them to perish. This is why there are more types of red flowers and yellow flowers in nature.

If the color of the flowers is black, it means that they cannot reflect any light, and all the sunlight will be absorbed. In this way, the flowers are easily burned by the high temperature of the sun, and the probability of survival of the flowers is smaller, so black flowers are very rare.

The final word: Everything in nature has its own law of survival. The reason why black flowers are rare is that it is difficult for them to survive in this world, and they are gradually eliminated by nature.

*Do plants change gender?
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There are male and female animals, and so do plants, but the sex of animals is generally determined at the embryonic stage, and rarely can be changed later in life. Is it the same for plants?

Unlike animals, the sex of plants is originally formed in the day after tomorrow. When plants grow and develop, the sex of plants begins to differentiate.At this time, the surrounding environmental conditions, such as the nutrient level of the soil, the humidity and temperature of the air, and the intensity of sunlight are all important factors affecting the sex differentiation of plants.Because of the uncertainty of these factors, there are also many variables in the sex differentiation of plants.If the environmental conditions are better and all aspects are superior, the plants generally appear as females, otherwise they appear as males.But generally speaking, once the sex of a plant is determined, it rarely changes. Males are responsible for producing pollen, while females are responsible for flowering and fruiting.

However, if the growth environment of the plant changes, the phytohormones in the plant begin to be disordered, and it is also possible for the plant to change sex.

For example, the height of Aria in India is generally between 100 and 700 mm. If the plants are more than 400 mm, most of them are females. If the plants are lower than this height, they are likely to be males.Because if Araceae wants to bloom and bear fruit, it must store more nutrients. Only when the plant grows taller and absorbs more sunlight, can it bloom and bear fruit.Therefore, when the height of the star is more than 380 mm, they are likely to change from male to female.

In general, plants can indeed change sex, which is a strategy they adopt in order to survive, and it is a change made to adapt to changes in the environment.

The final word: Plants not only have sex, but also change their sex as the environment changes. This is all for survival and reproduction, which is a countermeasure for plants to adapt.

*Why are most fruits sweet?
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Sour, sweet, bitter, spicy, salty, there are so many flavors in life, but the fruits we eat are basically sweet, why is this?

If you want to explore this question, you should start with the origin of plants.It's hard to say that there were no salty or bitter fruits at the beginning. After all, there are still fruits with such tastes, but they are rare.So it's not that most of the fruits are sweet, but most of the fruits we see are sweet, because those fruits that are not sweet may have been eliminated before they came to us.

At the beginning of the birth of plants, there must be a variety of tastes, but animals obviously prefer sweet fruits, so the probability of sweet fruits being picked is also greater.After these fruits are picked, they are taken to other places with animals. The sweet pulp is eaten, but animals cannot digest the seeds of the fruits. These seeds may be taken anywhere by animals, and the place where they breed is also The wider it becomes, the greater the hope for the continuation of the race.Over time, there are more and more sweet fruits, and the other fruits are gradually extinct. They may not even have the chance to reproduce because "no one cares about it."Most of the fruits we see today are sweet. It can only be said that this is the choice of nature, as Darwin said: "Natural selection, survival of the fittest."

As for why the fruit is sweet, it is necessary to mention the photosynthesis of plants.Plants absorb the energy of sunlight to produce more organic matter, and organic matter contains a lot of sugar, so the fruit of the plant will appear sweet.

The final word: Most of the fruits are sweet, which is the result of natural selection, because sweet fruits have a higher probability of being picked and have more chances of reproduction, while other "unpleasant" fruits gradually was eliminated.

* Do sunflowers always face the sun?

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The reason why the sunflower is called this name is because it has been facing the sun. It seems that everyone has such an idea in their hearts, otherwise why is it called "sunflower"!But is the sunflower really facing the sun as everyone thinks?
In fact, the answer is no.Sunflowers only face the sun during a certain period of growth, and when they are fully bloomed, they "abandon" the sun and choose to face the east all the time and bloom enthusiastically.

It's not that sunflowers are "ungrateful," it's the auxin in their bodies that drives them to do so.The auxin in the sunflower body will gather in large quantities under the condition of backlight, stimulating cell growth and elongation. Compared with the part facing the sun, the part facing the sun obviously grows faster and longer.Under the action of gravity, the young stems of the sunflower will bend toward the direction of the sun, and the flower disc at the top of the sunflower will naturally face the sun.

Since the sun has risen, it has been moving westward. At noon, the sunflowers are upright, and in the afternoon, the flower discs begin to face westward.But the sunflower does not "follow" the pace of the sun. There is a difference of 12 degrees between the sunflower and the sun. For example, it means that the sunflower will not stand upright until 48 minutes after the sun rises to the mid-heaven.

But after the sun sets, the influence of sunlight disappears, and the distribution of auxin becomes even again, so there is no so-called backlight and sunny, so the sunflower will raise its head, and wait until around 3 o'clock in the morning , and then quietly waiting for the sun to rise.

After the sunflower flower disc is in full bloom, because the pollen is afraid of high temperature, the flower disc is always facing east. In this way, when the sun shines at noon, the sunflower pollen can also hide behind the flower disc and not be burned by the high temperature.

The final word: sunflowers do not always face the sun. Only in the early stages of growth, sunflowers will show "positive" due to the uneven distribution of auxin. In fact, sunflowers are afraid of the sun's violent sunlight.

*Why can't people who are allergic to paint eat mangoes?
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There are tens of thousands of allergens in the world. I have heard that some people are allergic to paint and some people are allergic to mangoes, but have you heard that people who are allergic to paints may also be allergic to mangoes, so Should try to minimize exposure to mango?

Paint, mango, these two things seem to have nothing to do with each other, why are they brought together?In fact, it starts with the "family tree" of mangoes.

Mango is native to India, and it is a kind of Anacardiaceae tree. When you see this, someone should find out the problem. Why is this mango a Anacardiaceae, or the "lacquer" of the paint.That's right, it's the "paint".In the early years, most of the paints used by people were natural lacquers, which were drawn from nature, that is, plants of the Anacardaceae family, such as the most representative "lacquer tree", which is the raw material of lacquer.Raw lacquer is also called earth lacquer, and raw lacquer plays a very important role in both industrial and national defense fields.

Mangoes, like sumac trees, belong to the Anacardiaceae family. Most of the Anacardiaceae plants contain urushiol, catechol, laccase and other substances. These substances can be found in paints, even artificial paints, and these elements are indispensable.As a member of the Anacardiaceae family, mango naturally has these substances.

And these substances are toxic in themselves, if eaten or in contact with the skin, they are very irritating. Although there are not many irritating ingredients in mango, some will still remain. If you are allergic to paint, mango will naturally Also included in the list of allergens.

Another point is that even if you are not allergic to paint and mango, you should avoid eating mango with spicy food. If the two foods are eaten in large quantities at the same time, it will cause serious damage to the kidneys.

The final word: Paint and mango seem to be unrelated, but they are both "relatives" of Anacardiaceae.Both contain the same allergen, so people who are allergic to paint are best not to eat mango.

*Which plant lives the longest?
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The lifespan of human beings is only a few tens of years, and centenarians are considered to be the stars of longevity. Some animals' lifespan is even shorter, but there are many long-lived plants in nature, which can live for hundreds of years.What is the longest-lived plant in nature?

Is it the Australian eucalyptus?It is said that its lifespan can reach more than 4000 years.But the Giant Sequoia, known as the "God of the World", has lived for more than 5000 years.There is also a bristlecone pine in California, USA, which is more than 6000 years old.But none of them are the longest-lived plants. The longest-lived plants in the world are dracaena.

In 1868, when the famous natural geographer Humboldt was investigating in Africa, he found a big tree whose trunk had been blown off by a big storm on Oltha Island.But it was precisely because the trunk was broken by the wind that Humboldt was able to deduce that the tree was more than 8000 years old through the annual rings of the trunk.This is the well-deserved old birthday star in the plant world. This tree is called the dragon's blood tree. It is 18 meters high and the diameter of the main trunk is 5 meters. The storm blew the tree off from the ground 3 meters. Even the diameter of the section is more than 1 meter.

You may not believe it, but the dracaena belongs to the same lily family as the lily we usually see, but the lifespan of the dracaena is much longer than that of the lily.The growth rate of dracaena is very slow. It takes hundreds of years to grow from a seedling to a tree. They only bloom once a year, which is a very rare species.

Another peculiarity of the dragon blood tree is that after their branches are injured, the liquid that flows out is like blood, which is dark red. It is said that this is the blood of the dragon, which is the blood that flows on the ground when the dragon fights. , so this tree is called dracaena.In fact, this "blood" is a kind of resin, which can be used as medicine, and it is a very valuable traditional Chinese medicine.

The wood of the dragon's blood tree has a very strong antiseptic function, so the dragon's blood tree also occupies a very important position in industry.

The final word: The longest-lived plant in the world is the dracaena. Their lifespan is as short as 2000-6000 years, and generally they can live for 1-[-] years, and it is even possible to live up to [-] years.

*Which plants eat animals?

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Compared with animals, plants can't move and can't speak. It seems that they can only be eaten, but there are also some plants that are against the sky and can eat animals.Where are these plants sacred?

According to statistics, there are hundreds of species of plants that can eat animals in the world, and they are distributed in every corner of the world.However, most of these carnivorous plants are forced to "change their taste" by life. The places where they live are generally barren lands with poor soil and no grass.In order to obtain enough nutrients to maintain life activities, they can only target animals. In fact, the food of general carnivorous plants is some weak insects.

For example, Flytraps, their leaves grow like a "clamshell", with stiff hairs on the edges of the leaves. Once insects land on the leaves, the Flytraps will immediately secrete mucus to trap these "stumbles" "Insects.If the insects struggle, the Flytraps will secrete more mucus. These leaves are not only the "weapons" of the Flytraps, but also their digestive organs. Once the insects fall here, they will be slowly "digested" by the mucus Drop it and become the food in the belly of the Venus flytrap.

The pitcher plant is similar to the pitcher plant, except that the flowers of the pitcher plant are larger and can prey on larger animals. Frogs and birds fall into the "cage" of the pitcher plant, and they can't get out of it, they can only be eaten .

There is also a plant in Indonesia that can eat people, called cypress.Some of these trees are close to 10 meters, and their branches hang down on the ground like wires.If a person is accidentally touched by these branches, he will be tightly entangled immediately, and the surrounding branches will gather towards the prey. The person is trapped in the branches and cannot move, and then the branches will secrete a strong sticky glue , slowly "digesting" the prey.

Although carnivorous plants do not have sharp teeth like animals, they can secrete "digestive juice" to slowly absorb nutrients in animals.

The final word: There are hundreds of carnivorous plants, most of which are because the surrounding environment cannot provide the nutrients necessary for growth, so they turn their ideas to animals, and rely on eating animals to supplement nitrogen and other nutrients.

*Are there any walking plants?

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We all know that animals can walk, and we also know that plants grow in one place until they die after taking root in the soil, but we have never seen a "walking plant". Are plants still growing legs?

As the saying goes: "Trees move to die, people move to live." Plants have always been the representatives of "home care", let alone "walking", sometimes just move with the soil, and the plants will die due to changes in the environment.But there are such miraculous plants in the world that "can walk" by themselves, and there are more than one "walking plants".

The first thing to mention is the awakening tree in the United States. Every year when the drought comes, the awakening tree "wakes up". They "uproot themselves", then curl up into a ball, and float with the wind. They will re-root and continue to grow.As long as there is sufficient moisture in the soil, the wake tree will thrive and flourish.But once they feel the dry season coming, they will wake up in time to find the next place where they can take root and continue to grow.

There are also "walking plants" in South America, the walking cactus, which grows in the deserts of Peru and develops their roots into walking legs.The roots of walking cacti are clusters of soft spines, which take root in the soil and absorb water from the soil.When the water in the rooted soil cannot satisfy the walking cactus, these soft thorns will move slowly step by step under the push of the wind, and will not stop "walking" until they find a suitable place for their growth.

In the northeast of our country, there are also "tumbleweeds" that can walk. When autumn comes, they curl up into a ball, pull out their roots under the action of the autumn wind, and then roll with the wind like this. They can even roll in the ice and snow. Up dozens of miles.The tumbleweed will take root and settle down again in the coming spring, when all things are revived and the life of wandering will end.

The final word: These walking plants are more advanced than ordinary plants. If the current environment is no longer suitable for their growth, they will leave to find a more suitable environment for growth, or lie low-key and dormant, waiting for the arrival of spring.These plants cannot change the environment, but they can change themselves and find a more suitable environment for them.

* Why doesn't lettuce attract bugs?
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The lettuce we see is always very fresh and tender, and there are no insect eyes. Unlike other vegetables, there are more or less traces of insect visits. Why doesn’t lettuce attract insects?
Some people say that this is because lettuce is not a "domestic product" born and grown, but a vegetable imported from abroad. There are no worms suitable for eating lettuce in China, so lettuce does not attract worms.

In fact, this statement is not accurate.Lettuce is originally produced in the European Mediterranean, and the ancient Greeks and Romans first cultivated wild lettuce for consumption.Later, lettuce was introduced to China, and in recent years it has been planted in large quantities because of its popularity.Although it has only become popular in recent years, lettuce has been introduced to my country for many years. It is a bit untenable to say that there are no bugs suitable for eating lettuce.Moreover, lettuce leaves are relatively tender, which is very attractive to insects, especially aphids who love plant shoots.

Most of the lettuce we usually eat has been protected during the planting process, especially the lettuce from chain fast food restaurants, which is likely to be purchased at the special base of the company. Use nets, ultraviolet radiation and other methods to prevent lettuce from being affected by insects.However, if you grow lettuce yourself, these protective measures are generally not available, so the possibility of causing pest damage is still very high.

Lettuce is actually lettuce for leaves, but people habitually call it lettuce.Whether it is the lettuce we usually eat, or the leaf lettuce called lettuce, it is actually a cruciferous vegetable.Vegetables like shallots and garlic are all cruciferous vegetables, and leek maggots, aphids, and leaf miners are all natural enemies of cruciferous vegetables.

When we usually buy lettuce for consumption, it is best to blanch it in boiling water or stir-fry it at high temperature. Although the sweet and crisp taste of lettuce may be reduced, in this way, food safety will be guaranteed.

The final word: Lettuce is a vegetable with relatively high nutritional value, which can help us improve our immunity and help eliminate excess fat in the body.But lettuce is also a vegetable, and it attracts bugs, but it's not obvious.In order to ensure food safety, it is best not to eat raw lettuce at will.

(End of this chapter)