Pls help in the questions given below Subject is science
Answers
1. Goldsmith use the topmost part of the flame which is yellow in colour for melting gold and silver. Because it is the hottest part of the flame by which the gold melts quickly.
2. The most harmful effect of using fossil fuel is that it leaves residue after burning that pollutes the environment.
3. Paper bags versus polybags-
Strength: paper bags are strong but weaker as compared to the polybags.
Cost: polybags are cheaper than paper bags but paper bags are affordable.
Reusability: paper bags can be used less times as compared to the polybags.
Impact on environment: polybags have bad impacts on environment as compared to the paper bags.
Pollution: polybags are very bad pollutants but paper bags are eco friendly.
Fruit and vegetable sellers should use paper bags because it is affordable, much stronger, eco friendly, etc.
4. Microorganisms are used in making antibiotics. And...
5. Weeds are removed from fields during ploughing and tilling of soil, they get uprooted. And also weedicides are used.
6. Advantages of using a seed drill-
I. Seed are put in a proper distance.
II. Seed are put in proper dept.
7. Two chemical preservatives are-