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[A]: Stomata open when guard cells have ...

[A]: Stomata open when guard cells have more `H^+` .
[R]: Increased `K^+` concentrations results in exo-osmosis in guard cells.

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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TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
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  2. Assertion : Water and mineral uptake by root hairs from the soil occur...

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  4. [A]: In washed beet root cylinders, betacyanin pigment does not come o...

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  5. [A]: The rate of transpiration is indirectly proportional to RH. [R]...

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  6. [A]: Root cells have lower OP than leaf cells. [R]: Root cells have...

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  7. [A]: Root pressure is largely responsible for ascent of sap in herbace...

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  8. [A]: The nodulated bacteria fix nitrogen in the presence of leg Hb. ...

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  9. [A]: Plants growing under trees show less photosynthesis. [R]: Gree...

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

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

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

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

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

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

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

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

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

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

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

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