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[A]: Rhizobial aggregates have been obse...

[A]: Rhizobial aggregates have been observed at distinct sites on curled root hairs.
[R]: The infection thread is formed by a process of invagination of the hair cell walls in the region of curling

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

Text Solution

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The correct Answer is:
A
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TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
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  2. [A]: Hill and Bendall proposed Z-scheme and suggested that photosystem...

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  3. [A]: Rhizobial aggregates have been observed at distinct sites on curl...

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  4. [A]: Light is very important external factor of transpiration. [R]:...

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  5. [A]: Wax, resin and suberin coating on the surface of plant parts redu...

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  6. [A]: Gibberellic acid when added to isolated aleurone layer, induces a...

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  7. Assertion : Auxillary buds, in actively growing herbaceous plants, gen...

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  8. Assertion : If you burn a plant , its nitrogen component is given of...

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  9. [A]: Amino acids are converted into ammonia by a group bacteria called...

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  10. [A]: Due to excessive use of fertilizers, the available water to the p...

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  11. [A]: Vernalization is also called as yarovization. [R]: In short day...

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  12. [A]: Fundamental factor in the vernalization is low temperature. [R...

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  13. [Aj: ABA plays an important role in plants during water stress and dro...

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  14. (A]: Cytokinins help in retention of cholorophyll and delayed senescen...

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  15. [A]: The germination of lettuce seeds is stimulated by red light and i...

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  16. [A]: The far-red form of the phytochromes ab- sorb light at 740 nm. ...

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  17. [A]: Elongation and division of cells are pro- moted by gibberellins. ...

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  18. [A]: Senescence effect can be reversed by cytokinin. [R]: The loss ...

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  19. [A]: Wilting occurs due to loss in turgidity. [R]: Turgor pressure c...

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  20. [A]: Plasmolysis is seen by both living and dead cells. [R]: Both ty...

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