411.
All the following involves osmosis except
A
Movement of water from soil to root
B
Movement of water from root hair to endodermis and pericycle
C
Movement of water between xylem elements
D
Movement of water from xylem to mesophyll cells of the leaves
Answer :
Movement of water between xylem elements
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412.
If flowers are cut and dipped in dilute NaCl solution, then
A
Transpiration is low
B
Endo osmosis occurs
C
No bacterial growth takes palce
D
Absorption of solute inside flower cell takes place
Answer :
Transpiration is low
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413.
Who is called father of plant physiologt
A
K.V.Thimann
B
Stephan Hales
C
M.Calvin
D
E.Rabinowitch
Answer :
Stephan Hales
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414.
Removal of a ring of bark from the trunk of a tree eventually kills it because
A
Water can not go up
B
Fungi & insects attack exposed parts
C
Food does not travel down & root becomes starved
D
Air blocks the xylem
Answer :
Food does not travel down & root becomes starved
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415.
The loss of water in the form of water drops is taking place through the
A
Hydathodes
B
Lenticel
C
Stomata
D
All of the above
Answer :
Hydathodes
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416.
Why hygroscopic water is not available to plants
A
Because its ?w is greatly increased
B
Because its DPD is greatly decreased
C
Because ?w becomes strongly negative
D
Because its ?w is increased and DPD is decreased
Answer :
Because ?w becomes strongly negative
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417.
Which of the following factors inhibit the absorption of water by roots
A
Low soil temperature
B
High concentration of soil solution
C
Low soil aeration
D
All of the above
Answer :
All of the above
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418.
Phytochrome is present in
A
Vascular cryptogam
B
Prokaryotes
C
Brain cell
D
Kidney cell
Answer :
Vascular cryptogam
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419.
Potassium ions concentration is more in guard cells when stomata are open but less when stomata are closed . This was repoted by
A
Hsio, Fisher
B
Fujino
C
Levitt
D
Lloyd
Answer :
Fujino
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420.
Shape of guard cells in gramineae family
A
Kidney shaped
B
Oval
C
Round
D
Dumbel shaped
Answer :
Dumbel shaped
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