321.
By which porcess absorbed water reaches up to the leaves
A
Transpiration
B
Guttation
C
Root pressure
D
Ascent of sap
Answer :
Ascent of sap
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322.
Presence of thick cuticle, hairs , scales & fewer sunken stomata are found in the leaces of xerophyte it is to
A
Stop transpiration
B
Facilitate transpiration
C
Store water
D
Check excessive transpiration
Answer :
Check excessive transpiration
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323.
When the water potential of a cell become zero. It is said to be in
A
Fully turgid state
B
Flaccid state
C
Incipiently plasmolysed state
D
Completely plasmolysed state
Answer :
Fully turgid state
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324.
Stomata of a plant open due to
A
influx of calcium ions
B
influx of potassium ions
C
efflux of potassium ions
D
influx of hydrogen ions
Answer :
influx of potassium ions
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325.
When the concentration of the soil solutes is low, the absorption of water is
A
Retarded
B
Increase
C
Remains normal
D
Stopped
Answer :
Increase
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326.
Non-symbiotic N2 foxer is
A
Anabaena
B
Rhizobium
C
Azotobactor
D
Azolla
Answer :
Azotobactor
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327.
Which one of the following is not a synthetic auxin
A
2, 4-D
B
2-4-5T
C
NAA
D
IAA
Answer :
IAA
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328.
Water rises in the stem due to
A
Cohesion and transpiration
B
Turgor pressure
C
Osmotic pressure
D
None of the above
Answer :
Cohesion and transpiration
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329.
Phenyl mercuric acetate (PMA) results in
A
reduced photosynthesis
B
reduced transpiration
C
reduced respiration
D
killing of plants
Answer :
reduced transpiration
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330.
In poorly soil , the rate of water absorption will
A
Increase
B
Decrease
C
Remains the same
D
None of the above
Answer :
Decrease
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