1. Which of the following agricultural practices have been primarily responsible for pollution of our water resources?
1. Use of live-stock manure
2. Use of chemical fertilisers
3. Excessive use of chemical pesticides
4. Deforestation
1. Use of live-stock manure
2. Use of chemical fertilisers
3. Excessive use of chemical pesticides
4. Deforestation
2. Cloves, used as a spice, are derived from which of the following plant parts?
3. Breeding and management of bees is known as
4. Black soil is ideal for the cultivation of which of these crops?
5. Leghaemoglobin percent in the root nodules of leguminous plants helps in nitrogen fixation by
6. Nitrogen fixing bacteria is useful in growing which crop?
7. White tip of maize leaves indicates the deficiency of
8. Match the following columns.
Column I (Bacteria)
Column II (Function)
a. Nitrobacteria
1. Fixation of atmospheric nitrogen
b. Ammonifying bacteria
2. Formation of NH+4
c. Denitrifying bacteria
3. Formation of NO-3
d. Rhizobium
4. Formation of N2
| Column I (Bacteria) | Column II (Function) |
| a. Nitrobacteria | 1. Fixation of atmospheric nitrogen |
| b. Ammonifying bacteria | 2. Formation of NH+4 |
| c. Denitrifying bacteria | 3. Formation of NO-3 |
| d. Rhizobium | 4. Formation of N2 |
9. Vegetable oils are converted into solid fat (ghee) by
10. Which one of the following product is obtained from plant?
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