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Anonymous users2024-02-061.Pollution to the environment: DDT is an organochlorine pesticide that can cause serious pollution and damage to the environment, including the impact on aquatic organisms, crops, forests, etc. Therefore, the state prohibits the use of DDT as a pesticide to reduce its pollution to the environment.
2.Harm to human health: Long-term exposure and use of DDT may have negative effects on human health, such as causing allergies, respiratory diseases and other problems. Therefore, the state prohibits the use of DDT as a pesticide to protect people's health.
3.The need for global environmental protection: With the improvement of global environmental awareness, countries are strengthening environmental protection measures and prohibiting the use of harmful substances as pesticides. Therefore, the national ban on the use of DDT as a pesticide is also a necessary measure to comply with the global environmental protection trend.
In short, the state prohibits the use of DDT as a propaganda slogan to protect the environment and human health, and also to comply with the trend of global environmental protection.
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Anonymous users2024-02-05DDT is a stubborn poison that is highly toxic, with a effect that lasts for decades, accumulates when it enters the body because it is difficult to excrete, and finally dies of poisoning. It will flow along with the irrigation water to rivers and lakes, where it will be absorbed by fish and livestock, and eventually die because it cannot be discharged. If a person eats these poisonous products, he will also die because he cannot excrete them.
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Anonymous users2024-02-04Because it is too serious to pollute the environment after its use.
Therefore, the use of DDT is prohibited in all countries and regions
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Anonymous users2024-02-03Because DDT is too cheap, it is banned by the capital group on the grounds of polluting the environment.
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Anonymous users2024-02-02(1) Darwin called the process of survival of the fittest and the elimination of the unfit in the struggle for survival as natural selection Genetic variation is the basis of biological evolution, first of all, there are variations in the resistance of pests Some have strong resistance, and some have weak resistance When using pesticides, kill the pests with weak resistance, which is called the elimination of the unfit; Pests with strong drug resistance survive, which is called survival of the fittest Survive the pests with strong drug resistance, and some of the breeding offspring are strong drug resistance, and some are weak drug resistance, and when using insecticides, the mosquitoes with weak drug resistance are killed, and the mosquitoes with strong drug resistance survive In this way, after several generations of repeated selection, most of the mosquitoes that survive in the end are highly resistant, and the insecticides cause mosquito genetic mutations to make them resistant, and when using the same dose of insecticides, they can not play a good insecticidal role. As a result, the mosquito control effect of insecticides is getting worse and worse
2) Bioaccumulation refers to the process of accumulation of some harmful substances in the environment (such as heavy metals, chemical pesticides, etc.) in the living organisms through the food chain Because these harmful substances have the characteristics of chemical stability and not easy to decompose, they will accumulate in the organism and are not easy to excrete, so they continue to accumulate with the increase of trophic level, and the most harmful is the highest consumer of this food chain DDT is also found in Antarctic penguins that have not used DDT, which indicates that DDT is transmitted through the food chain, It has been added to the global material cycle
3) American biologist Rachel? Carson's alternative approach refers to not using highly toxic pesticides that cannot be degraded in living organisms or using biological control methods to control agricultural pests, that is, in the process of agricultural production, that is, to increase yields, but also to pay attention to environmental protection, reduce or avoid the use of pesticides, and use biological control
Therefore, the answer is: (1) there are differences between the individuals of pests, among which a very small number of individuals have strong resistance to DDT, survive in the environment with high concentrations of DDT, and reproduce a large number of offspring, their offspring have more individuals with the ability to resist DDT, after several generations, many individuals have the ability to resist DDT Therefore, the insecticidal effect of DDT is getting worse and worse This is the result of natural selection
2) My question is:
Why are high concentrations of DDT found in penguins?
My answer is.
Some of the DDT spilled into farmland is absorbed by plants, and some of it flows into the ocean with rainwater, is absorbed by marine organisms, and bioaccumulates along the food chain, and finally reaches the penguin's body at a concentration of millions of times that of DDT in seawater
3) Pay attention to environmental protection, reduce or avoid the use of pesticides, and adopt biological control
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Anonymous users2024-02-01(1) Darwin called the process of survival of the fittest and the elimination of the unfit in the struggle for survival as natural selection Genetic variation is the basis of biological evolution, first of all, there are variations in the resistance of pests Some have strong resistance, and some have weak resistance When using pesticides, kill the pests with weak resistance, which is called the elimination of the unfit; Pests with strong drug resistance survive, which is called survival of the fittest Survive the pests with strong drug resistance, and some of the breeding offspring are strong drug resistance, and some are weak drug resistance, and when using insecticides, the mosquitoes with weak drug resistance are killed, and the mosquitoes with strong drug resistance survive In this way, after several generations of repeated selection, most of the mosquitoes that survive in the end are highly resistant, and the insecticides cause mosquito genetic mutations to make them resistant, and when using the same dose of insecticides, they can not play a good insecticidal role. As a result, the mosquito control effect of insecticides is getting worse and worse
2) Bioaccumulation refers to the process of accumulation of some harmful substances in the environment (such as heavy metals, chemical pesticides, etc.) in the living organisms through the food chain Because these harmful substances have the characteristics of chemical stability and not easy to decompose, they will accumulate in the organism and are not easy to excrete, so they continue to accumulate with the increase of trophic level, and the most harmful is the highest consumer of this food chain DDT is also found in Antarctic penguins that have not used DDT, which indicates that DDT is transmitted through the food chain, It has been added to the global material cycle
3) American biologist Rachel? Carson's alternative approach refers to not using highly toxic pesticides that cannot be degraded in living organisms or using biological control methods to control agricultural pests, that is, in the process of agricultural production, that is, to increase yields, but also to pay attention to environmental protection, reduce or avoid the use of pesticides, and use biological control
Therefore, the answer is: (1) there are differences between the individuals of pests, among which a very small number of individuals have strong resistance to DDT, survive in the environment with high concentrations of DDT, and reproduce a large number of offspring, their offspring have more individuals with the ability to resist DDT, after several generations, many individuals have the ability to resist DDT Therefore, the insecticidal effect of DDT is getting worse and worse This is the result of natural selection
2) My question is:
Why are high concentrations of DDT found in penguins?
My answer is.
Some of the DDT spilled into farmland is absorbed by plants, and some of it flows into the ocean with rainwater, is absorbed by marine organisms, and bioaccumulates along the food chain, and finally reaches the penguin's body at a concentration of millions of times that of DDT in seawater
3) Pay attention to environmental protection, reduce or avoid the use of pesticides, and adopt biological control
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Anonymous users2024-01-31DDT worked very well during World War II, saving many soldiers and preventing the spread of large-scale plagues. But then it was discovered that it is a neurotoxin, which then accumulates in nature, causing the highest levels of DDT in organisms in the highest ecological chain to be too high and banned. However, according to my chemistry teacher, the effect of DDT is much better than that of pyrethroids used in insecticides today.
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