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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 ttJ_e tissue due to_ transpiration pull.

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:
C
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[A]: The water is absorbed by the root and moves into the stem. [R]: From root hair cell, water directly moves to xylem cells

[A]: Due to excessive use of fertilizers, the available water to the plants becomes hypo- tonic in relation to cell sap. [R]: The water molecules, as a result, diffuse out of the cells due to endosmosis.

[A]: In washed beet root cylinders, betacyanin pigment does not come out when placed in cold water. [R]: Because cell membrane is impermeable to betacyanin

Read the following statements, (i-v) regarding transpiration and answer the question which follows them (i) It creates transpiration pull for absorption and transport of plants. (ii) It supplies water for photosynthesis (iii) It transports minerals from the soil to all parts of the plants (iv) It heats leaf surfaces, sometimes 10 to 15 degrees (v) It maintains the shape and structure of the plants cells turgid Which of the above statement (s) is are correct?

Which of the following statements is /are true? (i) The apoplastic movement of water occurs exclusively through the cell wall without crossing any membranes. (ii) The apoplastic movement occurs from cell to cell through the plasmodesmata (iii) endodermis, is impervious to water because of a band of suberised matrix. (iv) Symplastic movement may be aided by cytoplasmic streaming which occurs in hydrilla leaf and chloroplast.

[A]: The rate of transpiration is indirectly proportional to RH. [R]: If the outer air is humid, it will reduce the diffusion of water vapour from intercellular spaces of leaf to the outer atmosphere.

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 occurs from its lower to higher...

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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 proportional to RH. [R]...

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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 capture insects to get nitrog...

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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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