| 1. | Which of the following crop is helpful in nitrogen fixation? |
A. rice | |
B. wheat | |
C. Pod | |
D. corn |
| 2. | What is the function of leghemoglobin in nitrogen fixation? |
A. absorption of oxygen | |
B. nutrition of bacteria | |
C. keep the roots red | |
D. absorption of light |
| 3. | Which of the following diseases is caused by bacteria? |
A. tuberculosis | |
B. Jaundice | |
C. chicken pox | |
D. mumps |
| 4. | Which is the free living bacterium that increases the yield of paddy in the soil? |
A. Rhizobium | |
B. azotobacter | |
C. acetobacter | |
D. Annabina |
| 5. | Refrigeration helps in food preservation – |
A. by killing bacteria | |
B. reduce the rate of biochemical reactions | |
C. destroy enzyme action | |
D. covering food with a layer of ice |
| 6. | Which of the following microorganism is used in curd setting? |
A. acetobacter | |
B. leuconostoc | |
C. Bacillus | |
D. lactobacillus |
| 7. | By which of the following milk is sour? |
A. protozoa | |
B. bacteria | |
C. virus | |
D. nematode |
| 8. | The reason for setting of milk in the form of curd is – |
A. mycobacterium | |
B. Staphylococcus | |
C. lactobacillus | |
D. yeast |
| 9. | Which of the following is a symbiotic nitrogen fixing bacterium? |
A. Rhizobium | |
B. azotobacter | |
C. Xandhomonas | |
D. pseudomonas |
| 10. | Who discovered the virus first? |
A. stockmann | |
B. Ivanovsky | |
C. Stanley | |
D. smith |