1What is a fertilizer? Why is it used?
2How many kinds of fertilizer are there? Define organic fertilizer and name the fertilizers that come under it.
3How is compost formed?
4What is green manure? What is the benefit of rotting legume plants in the field?
5Write any four advantages of organic fertilizer.
6What is a chemical fertilizer? On what basis is it classified, and into how many kinds? Give two examples of each.
7Write the importance of nitrogen in plants and the effects of its deficiency.
8What effects appear in a plant when phosphorus runs short?
9Write the importance of potassium and the effects of its deficiency.
10Write the advantages and disadvantages of chemical fertilizer.
11Why does a farmer see the effect of chemical fertilizer quickly but the effect of compost slowly?