161.
Which element essential for stability of chromosome structure
A
Zn
B
Ca
C
Mo
D
Fe
Answer :
Ca
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162.
The most powerful imbibant is
A
Agar-agar
B
Proteins
C
Cellulose
D
Lignin
Answer :
Agar-agar
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163.
The water potential of pure water is :
A
Less than zero
B
More than zero but less than one
C
More than one
D
Zero
Answer :
Zero
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164.
Minerals absorbed by roots move to the leaf through
A
xylem
B
phloem
C
sieve tubes
D
none of the above
Answer :
xylem
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165.
The main difference between active and passive transport across cell membrane is :
A
active transport occurs more rapidly than passive transport
B
passive transport is non-selective whereas active transport is selective
C
passive transport requires a concentration gradient across a biological membrane whereas active transport requires energy to move solutes
D
passive transport is confined to anionic carrier proteins whereas active transport is confined to cationic channel proteins
Answer :
passive transport requires a concentration gradient across a biological membrane whereas active transport requires energy to move solutes
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166.
Water is actively absorbed by root when
A
Soil solution is hypotonic
B
Soil solution is hypertonic
C
Transpiration rates are high
D
Shoot pressure is high
Answer :
Soil solution is hypertonic
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167.
Radial micellation of cellulose occurs at
A
Outer wall of guard cells
B
Inner wall of guaed cells
C
Inner wall of subsidiary cells
D
None of the above
Answer :
Inner wall of guaed cells
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168.
Osmotic pressure of a cell is zero when
A
T.P. is maximum
B
DPD is maximum
C
T.P. is zero
D
Not possible
Answer :
Not possible
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169.
Cuticular transpiration is observed mainly in
A
Xeropytes
B
Herbaceous plants
C
Trees
D
Shrubs
Answer :
Herbaceous plants
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170.
Highest concentration of auxin is found in
A
Root and Shoot tips
B
Leaves and Fruits
C
Mid stem portion
D
None of the above
Answer :
Root and Shoot tips
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