Q. No.Large holes in Swiss cheese are the result of fermentation by:
1. Streptococcus salivarius
2. Propionibacterium shermanii
3. Lactobacillus helveticus
4. Lactobacillus delbrueckii
1. Streptococcus salivarius
2. Propionibacterium shermanii
3. Lactobacillus helveticus
4. Lactobacillus delbrueckii
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Cyclosporin A is used as a/an:
| 1. | immuno-suppressive agent in organ transplant patients |
| 2. | clot buster to remove clots from the vessels in heart attack patients |
| 3. | treatment option in advance for HIV infections |
| 4. | agent that lowers blood cholesterol levels |
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During the secondary or biological treatment of sewage water:
| I. | The BOD of the wastewater gets reduced significantly. |
| II. | The activated sludge contains aerobic micro-organisms that can clump together. |
| III. | The entire activated sludge is pumped into anaerobic sludge digesters. |
1. Only I is correct
2. Only I and II are correct
3. I, II and III are correct
4. I, II and III are incorrect
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The diazotroph that serves as an important biofertilizer in paddy fields is:
| 1. | Rhizobium | 2. | Frankia |
| 3. | Azotobacter | 4. | Anabaena |
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Aspergillus niger is used in the commercial production of:
| 1. | Citric acid | 2. | Acetic acid |
| 3. | Lactic acid | 4. | Butyric acid |
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Match each item in Column I [biocontrol agent] with one in Column II [pest controlled] and select the answer from the codes given:
|
|
Column I |
|
Column II |
|
A. |
Ladybird |
P. |
Mosquitoes |
|
B. |
Dragonflies |
Q. |
Aphids |
|
C. |
Trichoderma |
R. |
Fungus |
|
D. |
Baculoviruses |
S. |
Virus |
Codes
|
A |
B |
C |
D |
|
|
1. |
P |
Q |
R |
S |
|
2. |
Q |
P |
R |
S |
|
3. |
P |
Q |
S |
R |
|
4. |
Q |
P |
S |
R |
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What advantage does the mycobiont get in the mycorrhizal symbiotic relationship?
| 1. | Adequate uptake of water |
| 2. | More availability of minerals like phosphorus |
| 3. | Availability of carbohydrates for energy |
| 4. | Resistance to diseases, drought, and salinity |
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Match each item in Column I [Diazotroph] with the feature in Column II and select the correct answer from the codes given below:
|
|
Column I |
|
Column II |
|
A. |
Cyanobacteria |
a. |
Actinorhizal symbiont |
|
B. |
Frankia |
b. |
Do not form nodules |
|
C. |
Rhizobium |
c. |
Free-living nitrogen fixer |
|
D. |
Azotobacter |
d. |
Legume symbiont |
Codes
| A | B | C | D | |
| 1. | a | b | c | d |
| 2. | b | a | c | d |
| 3. | a | b | d | c |
| 4. | b | a | d | c |
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The major problem with the use of chemicals to control plant diseases and pests is:
1. High cost
2. Ineffectivity against most pathogens
3. Difficulty in production
4. Non-specific nature
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The part of the complex stomach of ruminants that has methanogens present is the:
| 1. | Omassum | 2. | Abomasum |
| 3. | Rumen | 4. | Reticulum |
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