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[A]: Stomata remain open during day [R...

[A]: Stomata remain open during day
[R]: Stomata help in gaseous exchange.

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:
B
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TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. [A]: The water is absorbed by the root and moves into the stem. [R]...

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  2. [A]: Sulphur stabilizes protein structure. [R]: It does not partici...

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  3. [A]: Stomata remain open during day [R]: Stomata help in gaseous exc...

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  4. [A]: The nitrogen content of the plant cannot be detected accurately b...

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  5. [A]: Submerged plants, get CO2 in-the form of CO3^(-) & HCO3^(-3) [R...

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

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

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  8. Assertion. Calcium deficiency symptoms first appear in the apical regi...

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  9. Assertion: Deficiency of sulpur causes chlorosis in plants Reason : ...

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  10. Assertion : Water and mineral uptake by root hairs from the soil occur...

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  11. [A]: Stomata open when guard cells have more H^+ . [R]: Increased K^+...

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

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

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

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

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

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

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

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

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

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