Q. No.Consider the two statements:
I:
Indirectly, BOD is a measure of the organic matter present in the water.
II:
The greater the BOD of wastewater, the more its polluting potential.
1. Both I and II are correct
2. Only I is correct
3. Only II is correct
4. Both I and II are incorrect
2. Only I is correct
3. Only II is correct
4. Both I and II are incorrect
What is true regarding the activated sludge generated during the secondary treatment of sewage water?
| I: | It is made up of aerobic bacteria that sediment down |
| II: | A large part of the activated sludge is pumped back into the aeration tank to serve as the inoculum. |
| III: | A minor part of the sludge is pumped into large tanks called anaerobic sludge digesters. |
| 1. | Only I | 2. | Only II and III |
| 3. | Only I and III | 4. | I, II and III |
The part of the complex stomach of ruminants that has methanogens present is the:
| 1. | Omassum | 2. | Abomasum |
| 3. | Rumen | 4. | Reticulum |
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
What is incorrect regarding organic farming?
| 1. | It relies on controlling pests by natural predation rather than introduced chemicals. |
| 2. | A key belief of the organic farmer is that biodiversity furthers health. |
| 3. | Pests are totally eradicated. |
| 4. | Reduces dependence on toxic chemicals and pesticides. |
Match each item in Column I [Bio-control agent] with the pest/pathogen in Column II and select the correct answer from the codes given below:
|
|
COLUMN I |
|
COLUMN II |
|
A. |
Ladybird |
a. |
Aphids |
|
B. |
Dragonflies |
b. |
Mosquitoes |
|
C. |
Bacillus thuringiensis |
c. |
Butterfly caterpillars |
|
D. |
Trichoderma |
d. |
Fungi |
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 |
Baculoviruses are:
1. Species specific; Broad spectrum insecticides
2. Generalized; Broad spectrum insecticides
3. Species specific; Narrow spectrum insecticides
4. Generalized; Narrow spectrum insecticides
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 |
Arbuscular mycorrhizas are formed only by fungi in the division:
| 1. | Ascomycota | 2. | Glomeromycota |
| 3. | Basidiomycota | 4. | Microsporidia |
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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