Q. No.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
In paddy fields, important biofertilizers are:
| 1. | Cyanobacteria | 2. | Rhizobium |
| 3. | Frankia | 4. | Glomus |
Arbuscular mycorrhizas are formed only by fungi in the division:
| 1. | Ascomycota | 2. | Glomeromycota |
| 3. | Basidiomycota | 4. | Microsporidia |
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 |
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. |
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 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 |
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
‘Toddy’, a traditional drink of some parts in southern India, is made by fermenting sap from:
| 1. | Soyabean | 2. | Bamboo shoots |
| 3. | Palms | 4. | Sugarcane |
A biological control being developed for use in the treatment of plant diseases is the fungus:
| 1. | Trichoderma | 2. | Pneumocystis |
| 3. | Claviceps | 4. | Epidermophyton |
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