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Q. No.Mycorrhizal symbiotic fungi in plant roots primarily help in:
1. Nitrogen fixation
2. Phosphate absorption
3. Photosynthesis
4. Bicontrol
1. Nitrogen fixation
2. Phosphate absorption
3. Photosynthesis
4. Bicontrol
Subtopic: Microbes as Biofertilizer |
60%
From NCERT
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Consider the two statements:
| Assertion (A): | Use of chemical fertilisers in agriculture worldwide should be avoided. |
| Reason (R): | Chemical fertilisers, contrary to popular belief, are ineffective and do not add any nutrients to the soil. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True; (R) is False. |
| 3. | (A) is False; (R) is True. |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A). |
Subtopic: Microbes as Biofertilizer |
61%
From NCERT
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Consider the given two statements:
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is incorrect but II is correct
4. I is correct but II is incorrect
| I. | Glomus species cannot be cultured in the laboratory in the absence of a plant host. |
| II. | Glomus species form symbiotic relationships (mycorrhizae) with plant roots. |
2. Both I and II are correct but II does not explain I
3. I is incorrect but II is correct
4. I is correct but II is incorrect
Subtopic: Microbes as Biofertilizer |
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Which of the following microbes, capable of fixing atmospheric nitrogen, is an important biofertilizer in paddy fields?
1. Rhizobium
2. Frankia
3. Azotobacter
4. Anabaena
Subtopic: Microbes as Biofertilizer |
57%
From NCERT
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Consider the following statements regarding biofertilisers:
Which of the above statement(s) is/are correct?
1. (a) only
2. (b) only
3. Both (a) and (b)
4. Neither (a) nor (b)
| (a) | Rhizobium forms a symbiotic association with leguminous plants and helps in fixing atmospheric nitrogen into organic forms, benefiting the plant. |
| (b) | Azospirillum and Azotobacter are examples of symbiotic nitrogen-fixing bacteria that enrich soil nitrogen content. |
1. (a) only
2. (b) only
3. Both (a) and (b)
4. Neither (a) nor (b)
Subtopic: Microbes as Biofertilizer |
From NCERT
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Subtopic: Microbes as Biofertilizer |
55%
From NCERT
AIPMT - 1999
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NEET 2026 - Target Batch - Vital
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