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(A]: Cytokinins help in retention of cho...

(A]: Cytokinins help in retention of cholorophyll and delayed senescence in leaves.
[R]: Cytokinins only stimulate root initiation

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:
C
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Write "Yes" or "No" Cytokinin accelerates leaf senescence

[A]: Senescence is induced by the applica- tion of cytokinin in plants. [R]: Cytokinin promotes the breakdown of chlorophyll, proteins and nucleic acid.

Which of the following is not a function of cytokinin? 1.Delay Senescence 2.Lateral bud growth 3.Promotes cell division 4.Stem elongation

Assertion : A correct concentration of auxin and cytokinin is required for the development of root and shoot in callus. Reason: When the ratio of kinetin to auxin is high only shoot develop but when the ratio is low only roots develop

___prevents drainage of nutrients from mature leaves to delay leaf senescence.

Pick up correct statements (A) Cytokinins delay senescence (B) Auxin regulate apical dominance (C) Ethylene enhances seed germination (D) Gibberellins cause falling of immature leaves.

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Which one of the plant growth regulators would you use if you are asked to : (a) induce rooting in a twig. (b) quickly ripen a fruit (c ) delay leaf senescence (d) induce growth in axillary buds (e ) 'bolt' a rosette plant (f ) induce immediate stomatal closure in leaves.

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TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. [A]: Fundamental factor in the vernalization is low temperature. [R...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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