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Q. No.
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| Statement I: | The plant makes organic molecules such as sugars by photosynthesis and supplies them to the fungus. The fungus supplies to the plant water and mineral nutrients, such as phosphorus, taken from the soil. |
| Statement II: | Mycorrhizal plants are often more resistant to diseases, such as those caused by microbial soil-borne pathogens. |
| 1. | Statement I is correct but Statement II is incorrect |
| 2. | Statement I is incorrect but Statement II is correct |
| 3. | Statement I is correct and Statement II is correct |
| 4. | Statement I is incorrect and Statement II is incorrect |
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Arbuscular mycorrhizas are formed only by fungi in the division:
| 1. | Ascomycota | 2. | Glomeromycota |
| 3. | Basidiomycota | 4. | Microsporidia |
| Statement I: | They form a symbiotic relationship with the cyanobacterium Anabaena azollae. |
| Statement II: | Anabaena azollae is an extracellular endosymbiont (living outside the host's cells) which fixes atmospheric nitrogen. |
| 1. | Statement I is correct but Statement II is incorrect |
| 2. | Statement I is incorrect but Statement II is correct |
| 3. | Statement I is correct and Statement II is correct |
| 4. | Statement I is incorrect and Statement II is incorrect |
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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In paddy fields, important biofertilizers are:
| 1. | Cyanobacteria | 2. | Rhizobium |
| 3. | Frankia | 4. | Glomus |
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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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