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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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The phenomenon of delay of senescence by cytokinins is known as

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A natural occurring class of plant hormones cytokinins has been found to help increase cotton yields during drought conditions. It has been observed that young cotton seedlings have small root system, making it difficult for them to reach available soil water. Cytokinins assists the young plants in water stress defences, promoting the plant to quickly build a bigger root system to access deep soil mosture. To be effective this phytohormone should be at an early stage of development. Which hormone is synthesized at the shoot - tip of plant body ?

A natural occurring class of plant hormones cytokinins has been found to help increase cotton yields during drought conditions. It has been observed that young cotton seedlings have small root system, making it difficult for them to reach available soil water. Cytokinins assists the young plants in water stress defences, promoting the plant to quickly build a bigger root system to access deep soil mosture. To be effective this phytohormone should be at an early stage of development. "Plant hormones help to co - ordinate growth." Justify the statement by giving three examples.

A natural occurring class of plant hormones cytokinins has been found to help increase cotton yields during drought conditions. It has been observed that young cotton seedlings have small root system, making it difficult for them to reach available soil water. Cytokinins assists the young plants in water stress defenses, promoting the plant to quickly build a bigger root system to access deep soil moisture. To be effective this phytohormone should be at an early stage of development. What are phytohormones ?

Senescence of leaves can be delayed and shelf life of fruits can be increased by the spray of

[A]: Root system in hydrophytes is poorly de- veloped. [R]: The condition helps hydrophytes to avoid maximum water absorption

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 CO3^(-) & HCO3^(-3) [R...

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  15. [A]: The evolution of molecular oxygen is concerned with photosystem-1...

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  16. [A]: Antitranspirants are material applied to plants for retarding tra...

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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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