Question

57
28. Plastic cups were used to serve tea in trains in early days, these could be returned to the vendors,
cleaned and reused. Later, Kulhads were used instead of plastic cups. Now, paper cups are used for
serving tea.
What are the reasons for the shift from Plastic to Kulhads and then finally to paper cups ?
29. Explain where and how urine is produced ?
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Answer 1

Answer:

plastic cup are cheap but they are pollutants for every natural resource.So kulhadi are used as they are made from soil but they are quite expensive so finally paper cup is used as this is cheap, do not pollute environment and so on.

urine is produced in kidney where the water is filtered and waste are separated and we call the waste urine

hope this is helpfull