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[A]: The water molecules are held togeth...

[A]: The water molecules are held together from cells of leaf to root because of cohesive force.
[R]: Water does not ascend in the tissue due to transpiration pull.

A

1)If both A and R are true and R is the correct explanation of A

B

2)If both A and R are true but R is not the correct explanation of A

C

3)If A is true and R is false

D

4)If both A and R are false

Text Solution

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The correct Answer is:
C
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TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. [A]: The driving force for passive absorption is non metabolic in orig...

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  2. [A]: The movement of ions from endodermis to xylem elements is an acti...

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  3. [A]: The water molecules are held together from cells of leaf to root ...

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  4. [A]: Passive absorption of a substance oc- curs from its lower to high...

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  5. [A]: Xylem transports sap from root to shoot. [R]: Phloem transloca...

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  6. [A]: Maximum transpiration occurs in meso- phytes than xerophytes. ...

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  7. Assertion : Thick cuticle is mostly present in disease resistant pla...

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  8. Assertion. Submerged plants get carbon dioxide in the form of carbona...

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  9. [A]: Phloem is the main conducting tissue. [R]: Phloem does the· fu...

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  10. [A]: Antitranspirants are used to retard tran- spiration. [R]: AbA ...

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  11. [A]: Rate of transpiration is high in low wind velocity. [R]: Wind r...

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  12. [A]: The rate of transpiration is indirectly pro- portional to RH. [...

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  13. [A]: High pH in guard cells activate phosphorylase to convert starch i...

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  14. [A]: Daily periodicity of stomata movement is not the characteristic o...

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  15. [A]: In Nepenthes, lamina is modified to cap- ture insects to get nitr...

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  16. [A]: The downward· movement of minerals through soil is effected by qu...

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  17. [A]: Auxins are found in large amounts in the apical Meristem of shoot...

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  18. [A]: In C4 plants, CO2 fixation occurs at three sites. [R]: CO2 is f...

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  19. [A]: Oxidation of H2O takes place during pho- tosynthesis. [R]: Ph...

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  20. [A]: The rate of photosynthesis is determined in terms of the rate of ...

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