271.
Water of guttation is
A
Pure water
B
Water with dissolved salts
C
Solution of organic food
D
Condensed water vapour
Answer :
Water with dissolved salts
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272.
Excessive loss of water causes wilting of leaves , it can be prevented by
A
Keeping the plant in bright light
B
Spraying the plant with alcohol
C
Applying vaseline on the leaf surface
D
Adding high amounts of fertilizers to the soil
Answer :
Applying vaseline on the leaf surface
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273.
Osmosis involces diffusion of
A
Suspended particles from higer to lower concentration
B
Suspended particles from lower to higher concentration
C
Water from more to less concentrated solution
D
Water from less to more concentrated solution
Answer :
Water from less to more concentrated solution
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274.
Capillary force theory to explain ascent of sap was proposed by
A
Boehm
B
Sachs
C
Jamin
D
Priestlay
Answer :
Boehm
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275.
The rate of transpiration will be high when there is
A
Rainy season
B
Winter season
C
Summer season
D
None of the above
Answer :
Summer season
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276.
Gibberellins promotes cell division and elongation in
A
Leaves
B
Roots
C
Shoots
D
All of the above
Answer :
All of the above
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277.
Ringing experiment is to show
A
Path of sacent of sap
B
Comparision of transpiration
C
Passive absorption
D
Stomatal opening & closing
Answer :
Path of sacent of sap
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278.
A column of water within xylem vessels of tall trees does not break under its weight because of:
A
Tensile strength of water
B
Lignification of xylem vessels
C
Positive root pressure
D
Dissolved sugars in water
Answer :
Tensile strength of water
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279.
Significance of transpiration lies in
A
Circulation of water
B
Absorption and distribution of water
C
Regulating the temperature of the plant body
D
All of the above
Answer :
All of the above
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280.
Active absorption of water from the soil by the root is mainly effected by
A
Typical tissue organisation
B
Respiratory activity of root
C
Tension on cell sap due to transpiration
D
None of the above
Answer :
Respiratory activity of root
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