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Assertion . Senescence is the time when ...

Assertion . Senescence is the time when age associated defects are manifested
Reason . Certain genes may be undergoing sequential switching on and off during one's life

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

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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] : 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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