Question
What are fertilizers? Classify fertilizers.
Example: Urea, CO(NH2)2.
Example: Potassium sulphate, K2SO4.
Example: Nitrophosphate.
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What is hierarchy of categories?

Explain the term ‘pitch’ of a sound. On what factor does the ‘pitch’ of a sound depend?
Name the articles which act as nucleus for water droplets to form around in the atmosphere.