Subject :NSO Class : Class 7
Subject :NSO Class : Class 8
Study the given flow chart and identify P, Q and R.
| P | Q | R | |
| A | Livestock wastes | Styrofoam cup | DDT |
| B | Garbage | BHC | Aluminium cans |
| C | Sewage sludge | DDT | Styrofoam cup |
| D | Livestock wastes | BHC | Grocery |
Styrofoam cup is not recyclable...then how come is the correct answer is A.It should be c
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Subject :NSO Class : Class 8
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Subject :NSO Class : Class 8
Find which is not correctly matched.
| A | A neutral substance | Salt |
| B | Substances that turn turmeric solution red | Bases |
| C | Chemical applied on ant bite | Calamine solution |
| D | Substances used to test acids only | Indicator |
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 9
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Subject :NSO Class : Class 8
Ans 3:
Class : Class 10
Fertilizer can be both acidic or basic. Some fertilizers have Urea, Ammonium Nitrate as constituents due to which they are acidic. However salts of Potassium such as Potassium Nitrate and Phosphate are also used that are strong bases.
Ans 7:
Class : Class 10
As per the activity mentioned in NCERT and my own research, the most appropriate answer should be A, because fertilizers boost plant growth and are nutrient specific, meaning they replenish the nutrients.
Ans 9:
Class : Class 10
The answer should be (A) because Urea is an acid and contains high amounts of Hydrogen and Nitrogen. It is also considered as a fertilizer because fertilizer is an acid just like urea and also fertilizer contains high amounts of hydrogen and nitrogen. Fertilizer also allows the maximum plant-growth. So, it should be (A).