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[A]: The far-red form of the phytochrome...

[A]: The far-red form of the phytochromes ab- sorb light at 740 nm.
[R]: The red form of phytochrome absorbs light at 660 nm

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:
B
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TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. (A]: Cytokinins help in retention of cholorophyll and delayed senescen...

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

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

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

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

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

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

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  8. [A]: The water is absorbed by the root and moves into the stem. [R]...

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  9. [A]: Sulphur stabilizes protein structure. [R]: It does not partici...

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  10. [A]: Stomata remain open during day [R]: Stomata help in gaseous exc...

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  11. [A]: The nitrogen content of the plant cannot be detected accurately b...

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  12. [A]: Submerged plants get CO2 in the form of carbonates and bicarbonat...

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  13. [A]: The evolution of molecular oxygen is con- cerned with photosystem...

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  14. [A]: Antitranspirants are used to retard tran- spiration. [R]: AbA ...

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  15. Assertion. Calcium deficiency symptoms first appear in the apical regi...

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  16. Assertion: Deficiency of sulpur causes chlorosis in plants Reason : ...

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  17. Assertion : Water and mineral uptake by root hairs from the soil occur...

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  18. [A]: Stomata open when guard cells have more H^+ . [R]: Increased K^+...

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  19. [A]: In washed beet root cylinders, betacyanin pigment does not come o...

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  20. [A]: Rate of transpiration is directly propor- tional to relative humi...

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