Questions

QUESTIONS

(A)   Fill in the blank:

1. Microorganisms are found everywhere so they are _____.

Ans: (ubiquitous)

2. Milk gets converted into curd by the action of bacteria _____.

Ans: (Lactobacillus)

3. _____ is used in distilleries to produce alcohol.

Ans: (Yeast)

4. Fermentation means conversion of _____ into _____ by the action of _____.

Ans: (Sugar, alcohol, yeast)

5. Yeast is used for making bread & cake it helps in making dough _____ & _____.

Ans: (Soft, Spongy)

6. The side product produced during fermentation beside alcohol is _____.

Ans: (Carbon dioxide)

7. Streptomycin is an example of _____.

Ans: (Antibiotic)

8. A solution containing dead weakened pathogen which is used for preventing disease is known as _____.

Ans: (Vaccine)

9. A vaccine contains dead or weakened _____ or prepared _____.

Ans: (Antigen, Antibodies)

10. _____ are used to kill pathogen for treatment of diseases.

Ans: (Antibiotics)

11. When a disease-carrying microbe enters our body, the body produces _____ to fight the invader.

Ans: (Antibodies)

12. Organisms like nitrosomonas are used for improving ______.

Ans: (Soil fertility)

13. Rhizobium is found in root nodules of ______ plants.

Ans: (Leguminous)

14. Nitrosomonas and Nitrobacter are found in ______.

Ans: (Soil)

15. Micro organisms decompose dead organic waste of plants and animals are called as ______.

Ans: (Decomposers)

(B)   Match the following:

Ans: 1 – C; 2 – D; 3 – E; 4 – A; 5 – B

Ans: 1 – c; 2 – a; 3 – d; 4 – b

(C)   Multiple Choice Questions:

1. In agriculture, ______ are used to increase soil fertility by fixing nitrogen.

(a) Virus               (b) Protozoan      (c) Bacteria          (d) Fungi

Ans: (c)

2. ____ promotes the formation of curd.

(a) Rhizobium                                  (b) Lactobacillus

(c) Chlorella                                     (d) All

Ans: (b)

3. _____ is used for commercial production of alcohol and wine.

(a) Yeast              (b) Rhizobium   (c) HIV                  (d) Amoeba

Ans: (a)

4. Process of conversion of sugar into alcohol is known as _____

(a) Nitrogen fixation                       (b) Fermentation

(c) Curdling of milk                         (d) Pasteurization

Ans: (b)

5. Streptomycin, tetracycline and erythromycin are-

(a) Vaccine         (b) Drugs             (c) Antibiotics     (d) None of the above

Ans: (c)

6. In presence of microorganism, human body produces-

(a) Antibiotics                                 (b) Antibodies

(c) Vaccine                                       (d) All of the above

Ans: (b)

7. Insertion of weak and dead microorganism to defend diseases is called-

(a) Vaccination                                (b) treatment

(c) both of the above                      (d) none of the above

Ans: (a)

8. Which of the following is/are application/s of microorganisms?

(a) Cleaning the environment

(b) Increasing soil fertility

(c) Production of vaccine     

(d) All of the above

Ans: (d)