71.
Guttation usually occurs in a well watered herbaceous plant and well drained soil only in
A
Morning hours
B
Evening hours
C
None hours
D
Day hours
Answer :
Morning hours
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72.
The spray of PMA causes
A
Decrease in transpiration
B
Increase in transpiration
C
Increase in absorption
D
Increase in guttation
Answer :
Decrease in transpiration
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73.
The pulsation theory is related with
A
Guttation
B
Bleeding
C
Vital theory for ascent of sap
D
Physical theory for ascent of sap
Answer :
Vital theory for ascent of sap
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74.
If the molar concentration of given sugar solution is 0.3 M, find out the osmotic pressure of this solution
A
6.72 atm
B
67.2 atm
C
2.24 atm
D
5.60 atm
Answer :
6.72 atm
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75.
If temperature remains constant then with increasing altitude , the transpiration will
A
Increases
B
Decreases
C
First increases then decreases
D
Unaffected
Answer :
Increases
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76.
The absorption of waterdue to expenditure of energy is called
A
Non osmatic absorption
B
Oamotic active absorption
C
Paddive aborption
D
All of the above
Answer :
Non osmatic absorption
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77.
Sap ascends in woody stem because of
A
Trnspirtion pull
B
Capillarity
C
Moleculra adhesion
D
Photsynthesis
Answer :
Trnspirtion pull
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78.
Osmotic pressure is highest in
A
Xerophytes
B
Lithophytes
C
Halophytes
D
Mesophytes
Answer :
Halophytes
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79.
The amino acid having S in its composition is
A
Cystine
B
Cysteine
C
Methionie
D
All of the above
Answer :
All of the above
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80.
Which plant hormone help in active absorption of water
A
Auxin
B
GA
C
Cytokinin
D
ABA
Answer :
Auxin
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