141.
Which one is not related to transpiration
A
Regulation of plant body temperature
B
Absorption and distribution of mineral salts
C
Circulation of water
D
Bleeding
Answer :
Bleeding
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142.
Guttation take place during night when
A
Root pressure is positive
B
Root pressure is negative
C
Always take place
D
It does not takes place at all
Answer :
Root pressure is positive
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143.
Water potential of actively absorbing cells is
A
always + ve
B
always - ve
C
always 0
D
always > 1
Answer :
always - ve
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144.
Which of the following may be the substitute of photoperiodism
A
Humidity
B
Temperature
C
Mineral nutrients
D
Soil moisture
Answer :
Temperature
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145.
In CAM plant stomata are
A
Closed at night and open during the day
B
Closed during the day and open at night
C
Never
D
Never opens
Answer :
Closed during the day and open at night
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146.
What is the value of DPD of a cell
A
DPD = OP × TP
B
DPD = OP + TP
C
DPD = OP - TP
D
DPD = OP ÷ TP
Answer :
DPD = OP - TP
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147.
When the cell is placed in water, it takes water this is due to
A
Osmotic pressure
B
Srctionpressure
C
Diffusion
D
Water potential and TP
Answer :
Srctionpressure
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148.
Water enters into the root hair from the soil its normal condition because the pressure of the soil solution
A
Remains lesser than that of root hair sap
B
Remains equal to that of root hair sap
C
Remains higher than that of root hair sap
D
And that of root hair sap remains zero
Answer :
Remains lesser than that of root hair sap
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149.
Which of the following is a rapid type of absorption
A
Passive absorption
B
Active absorption
C
Salt absorption
D
Root absorption
Answer :
Passive absorption
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150.
Halophytes can grow on physiologically dry due to
A
Dry soil
B
Excessive humidity outside
C
Excessive salts in plants
D
Excessive salts in water ASCENT OF SAP
Answer :
Excessive salts in plants
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