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Asserion : Long distance flows of photo...

Asserion : Long distance flows of photoassimilates in plants occurs through seive tubes
Reason : Mature seive tubes have parietal cytoplasm and prforated seive plates

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:
A
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TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. [A]: Plants growing under trees show less photosynthesis. [R]: Gree...

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  2. [A]: Chlorophylls usually show red fluorescence though they absorb blu...

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  3. Asserion : Long distance flows of photoassimilates in plants occurs t...

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  4. [A]: Rhoea discolor leaves contain anthocya-nin in epidermal cells [...

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  5. [A]: Ringing/Girdling experiments involved removal of all tissues outs...

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  6. [A]: Action spectra for photosynthesis help to identify the pigments i...

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  7. [A] : C3 & C4 cycle can not occur in the same plant [R] : C3 cycle ...

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  8. [A]: Photosynthesis is an oxidation reduction process. [R]: Electron...

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  9. Assertion. Nitrogen deficiency induced purplish colouration in stems, ...

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  10. Asserotion: C(4) photosynthetic pathway is more efficient than the C(3...

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  11. Assertion. The atmospheric concentration of CO(2) at which photosynthe...

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  12. Assertion: Sigmoid growth curve consists of four parts. Reason : La...

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

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

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

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

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

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

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

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

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