Question
Name one inorganic nitrogenous fertilizer.
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Name two ecological problems which are caused by application of synthetic chemicals to crop fields.
Name the characters in which seed plants differ from pteridophytes.
Name one fresh water and one marine fish of India.
Narne the region of atmosphere where (a) ozone layer is present (b) Most of the atmospheric gases are present.
Who is close to us, monkey or cow?
What are signs of disease?
Enlist different desired traits of the parents chosen for selective breeding.