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[A]: Senescence is induced by the applic...

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

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

[A]: Senescence effect can be reversed by cytokinin. [R]: The loss of liquid from leaves of intact plant is termed as guttation.

Go through the following matches (i) Abcisic acid - Delays senescence (ii) Auxins - Control xylem (iii) Gibberellins -Cause fruits like apple to elongate and improve its shape (iv) Cytokinins - Promotes apical domiance caused by auxins Which of these are correct :

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 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 ?

TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. Assertion: Sigmoid growth curve consists of four parts. Reason : La...

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  2. [A] : 2,4-D is a herbicide [R] : It is not used during showing of cr...

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  3. [A] : Nastic movements occur in the directions of stimuls [R] : "Tou...

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  4. [A] : Germinating seeds which store fats as reserve food material are ...

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

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  6. [A] : When apical bud is removed, the next axial bud begins to grow ou...

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  7. [A]: Xanthium will not flower if the long dark period is interrupted b...

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  8. [A]: Senescence is induced by the applica- tion of cytokinin in plants...

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  9. Assertion : A correct concentration of auxin and cytokinin is required...

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  10. [A]: The endogenous level of plant hormones is measured by Bioassay te...

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  11. [A] : Bolting of rosette plants is caused by Gibberellins. [R]: Gibb...

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

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  13. [A]: Plants hormones are called phytohormones [R]: They increase ra...

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  14. [A] : Senescence occurs in all non meristematic cells. [B]: Meristem...

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  15. Assertion . Senescence is the time when age associated defects are man...

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  16. Assertion: Photosynthetically C(4) plants are less efficient than C(3)...

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  17. [A]: The atmospheric concentration of CO2 at which photosynthesis just...

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  18. [A]: C4 pathway is more efficient that n C3 pathway. [R]: Photorespi...

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  19. Assertion : Photomorphogenetic responses are controlled by the pigment...

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  20. [A] : Some plants flower only in summers & some only in winters. [R]...

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