261.
The "Guttation " word was given by
A
Bergerstein
B
Sayer
C
Scarth
D
Stephen hales
Answer :
Bergerstein
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262.
Criteria for essentiality in mineral nutrition were shown firstly by
A
Arnon
B
Liebig
C
Steward
D
Levitt
Answer :
Arnon
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263.
The change in turgor pressure which causes the opening and closing of Stomata in caused by
A
Reversible starch - sugar conversions
B
Reversible absorption and loss of K-ions
C
Loss of chloride ions
D
None of the above
Answer :
Reversible absorption and loss of K-ions
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264.
According to Scarth the opening & closing of stomata is governed by
A
PH
B
Phosphorylation
C
NaDPH2
D
Enzymes
Answer :
PH
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265.
Transpiration and root pressure cause water to rise in plants by :
A
Pulling and pushing it, respectively
B
Pushing it upward
C
Pushing and pulling it, respectively
D
Pushing it upward
Answer :
Pulling and pushing it, respectively
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266.
Due to more wind velocity, the transpiration rate will be
A
Less
B
More
C
Unaffected
D
First increases then decrease
Answer :
First increases then decrease
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267.
The process involved in the formation of Toddy is
A
Guttation
B
Transpiration
C
Bleeding
D
All of the above
Answer :
Bleeding
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268.
If is possible to drop a small particle through the stomata of leaf, what will you conclude
A
It will on the earth surface
B
It will stop on lower epidermis
C
It will stop on mesophyll cells
D
It will stop on vascular tissue
Answer :
It will stop on mesophyll cells
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269.
With increase in the turgidity of a cell surrounded by water the wall pressure will
A
increase
B
decrease
C
fluctuate
D
remain unchanged
Answer :
increase
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270.
A cell increases in volume if the external medium is
A
Hypotonic
B
Slightly hypertonic
C
Isotoic
D
Much more concentrated than the protoplasm of the cell
Answer :
Hypotonic
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