The main product of bacterial action is_________________?

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Which of the following is a macro nutrient ?

A. boron B. iron C. copper D. carbon...

Three elements needed for the healthy growth of plants are_________________?

A. N P K B. N K C C. N S P D. N Ca P...

Pollutants have adverse effect over_________________?

A. Biosphere B. Ecosystem C. Both a & b D. Hydrosphere...

Which of the following is not a heavy industry ?

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Ozone hole is substantial depletion of ozone in every year during__________________?

A. Aug – Nov B. Sep – Nov C. Nov – Dec D. Dec – Jan...