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DDT along with other 21 chemicals was banned in Nepal in 2001. What do you think was the cause?
Write differences between Chemical pesticides and biological pesticides
Write differences between Chemical food preservative and organic food preservative.
Write differences between Soap and detergent.
Give reason: The use of DDT powder causes imbalance in the ecosystem.
Give reason: The use of chemical pesticides should be decreased.
Give reason: Salt is used in the process of making soap.
Pickles can be preserved for a long time. Give reason.
Write the full forms of DDT and BHC.
What do you mean by food preservatives? Why are they used?
What chemicals are used as food preservatives?
What are the natural methods used to preserve the nutrients of food?
What do you mean by natural food preservatives? Why are they good in comparison to the chemical food preservatives? Analyze it.
How can fruits be ripened artificially? Write methods and processes for it.
What precautions should be taken while using chemical pesticides?
Make a list of chemicals used for cleaning purposes in your house and locality? Write the effects of these substances in the environment.
Explain the soap making process.
Why is detergent called a soapless soap?
Identify the group of insecticides.
In which group does sodium stearate lie?
What is the main use of detergents?
Which of the following compounds is used to ripen fruits?
What is detergent? Write two examples. What effects are seen on human health and the environment due to the use of detergent? Present your argument.
There has been an excessive use of chemical pesticides in Hari's village due to which complex problems have been observed in the health of people and the environment. What may be the alternatives to solve these problems? Give some suggestions.
What do you mean by chemical pollution? What are its effects? Write practical ways to minimize it.
Write about the pollution caused by industrial products like cement, glass, ceramics, plastic, fiber, chemical fertilizers, soap, detergent, etc. in your locality. Write its causes and suggest proper ways for management.
Why is food preservatives used?
Cement, glass, ceramics, plastic, fibre, chemical fertilizer, soap, pesticides, detergents are the chemical pollutants. Write any two ways to minimize the effect of mutation caused by the pollutants among them.
Why is detergent considered as more pollutant than soap?
Write the balanced chemical equation for the manufacturing process of urea.
Two persons use the same tap water to wash the clothes. Person A used soap and hot (boiled) water while person B used cold water and detergent. Give any one reason for using hot water by person 'A' and using detergent by persons 'B'.
We should use and store pesticides carefully. Write two reason behind this.
Pollutants of a city are shown in the given diagram.
- Which pollutants of them is non biodegradable?
- How can we manage such pollutants?
Detergent is considered more efficient than soap in laundry, why?
A survey of a rice field has found the problem of erosion due to excessive use of chemical fertilizers. How can it be controlled? Mention any two points.
Define food preservatives with an example. Write any two points those should be remembered while using food preservatives.
A farmer applies different fertilizers to his cotton crops. He wants to see which will make his plants grow the highest. What is the independent variable?
DDT along with other 21 chemicals was banned in Nepal in 2001. What do you think was the cause?
Write differences between Chemical pesticides and biological pesticides
Write differences between Chemical food preservative and organic food preservative.
Write differences between Soap and detergent.
Give reason: The use of DDT powder causes imbalance in the ecosystem.
Give reason: The use of chemical pesticides should be decreased.
Give reason: Salt is used in the process of making soap.
Pickles can be preserved for a long time. Give reason.
Write the full forms of DDT and BHC.
What do you mean by food preservatives? Why are they used?
What chemicals are used as food preservatives?
What are the natural methods used to preserve the nutrients of food?
What do you mean by natural food preservatives? Why are they good in comparison to the chemical food preservatives? Analyze it.
How can fruits be ripened artificially? Write methods and processes for it.
What precautions should be taken while using chemical pesticides?
Make a list of chemicals used for cleaning purposes in your house and locality? Write the effects of these substances in the environment.
Explain the soap making process.
Why is detergent called a soapless soap?
Identify the group of insecticides.
In which group does sodium stearate lie?
What is the main use of detergents?
Which of the following compounds is used to ripen fruits?
What is detergent? Write two examples. What effects are seen on human health and the environment due to the use of detergent? Present your argument.
There has been an excessive use of chemical pesticides in Hari's village due to which complex problems have been observed in the health of people and the environment. What may be the alternatives to solve these problems? Give some suggestions.
What do you mean by chemical pollution? What are its effects? Write practical ways to minimize it.
Write about the pollution caused by industrial products like cement, glass, ceramics, plastic, fiber, chemical fertilizers, soap, detergent, etc. in your locality. Write its causes and suggest proper ways for management.
Why is food preservatives used?
Cement, glass, ceramics, plastic, fibre, chemical fertilizer, soap, pesticides, detergents are the chemical pollutants. Write any two ways to minimize the effect of mutation caused by the pollutants among them.
Why is detergent considered as more pollutant than soap?
Write the balanced chemical equation for the manufacturing process of urea.
Two persons use the same tap water to wash the clothes. Person A used soap and hot (boiled) water while person B used cold water and detergent. Give any one reason for using hot water by person 'A' and using detergent by persons 'B'.
We should use and store pesticides carefully. Write two reason behind this.
Pollutants of a city are shown in the given diagram.
- Which pollutants of them is non biodegradable?
- How can we manage such pollutants?
Detergent is considered more efficient than soap in laundry, why?
A survey of a rice field has found the problem of erosion due to excessive use of chemical fertilizers. How can it be controlled? Mention any two points.
Define food preservatives with an example. Write any two points those should be remembered while using food preservatives.
A farmer applies different fertilizers to his cotton crops. He wants to see which will make his plants grow the highest. What is the independent variable?