Pesticides and insecticides are chemicals used to kill pests and insects that affect the production of crops.

How do biotic and abiotic factors affect crop production ?

_______ are chemicals that provide nutrients to crops and increase their production.

Sulphuric acid is manufactured by Contact process : Name the chemical used to dissolve SO_3 and also name the product formed.

Your company has given you the task of popularising the use of biopesticides and not chemical pesticides. How will you explain that use of biopesticides is better than use of chemical pesticides?

Assertion : the disadvantages of chemical pesticides can be overcome by the use of biopesticides. Reason: Biopesticides are the harmless pesticides of biological orgin which are used to cotrol weeds and pests without causing any significant damage .

Weedicides used in the crop fields kill the weeds by

Biocontrol agents are preferred over chemical methods of pests and disease control because- a. They are non toxic for non targeted organisms b. They do not kill useful organisms c. They keep pests at manageable levels

The representation of a chemical reaction by using the symbols and formulae of the reactants and the products involved in the reaction is called its chemical _____

Write the chemical formula and name of the compound which is the active ingredient of all alcoholic drinks. List its two uses. Write chemical equation and name of the product formed when this compound reacts with- (i) sodium metal (ii) hot concentrated sulfuric acid