A farmer adds Azotobacter culture to the soil before sowing maize.Which mineral element is being replenished ?

A farmer adds Azotobacter culture to the soil before sowing maize. How does it increase the yield of maize?

A farmer grows gram crop between two cereal crops. Which agricultural practice is being followed by him ?

These questions consist of two statements each,printed as Assertion and Reason.While asnwering these questions you are required to chose any one of the following four responses. If both Assertion and Reason are true and Reason in correct explanation of Assertion. If both assertion and Reason are true but reason is not correct explanation of Assertion. If Assertion is true but Reason is false. If both Assertion and Reason are false. Assertion:Minerals are mainly absorbed by roots which are in direct contact with atmosphere. reason:The absorbed mineral elements are transported from leaves to stem through xylem.

Which of the following statements are true? If false, correct them: Every mineral element that is present in a cell is needed by the cell.

Lemonade is prepared by mixing lemon juice and sugar in water.You wish to add ice to cool it.should you add ice to the lemnade before or after dissolving sugar ?In which case would it be possible to dissolve more sugar ?

Why is ploughing of soil necessary before sowing seeds or crop plants?