441.
Certain chemical substances having profound effect on plant growth are called
A
Catalyic
B
Phytohormones
C
Enzymes
D
Compost
Answer :
Phytohormones
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442.
Transpiration will increase with the increase of
A
Humidity
B
Temperature
C
Carbon dioxide
D
Sulphur dioxide
Answer :
Temperature
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443.
Which conditions favours "Guttation
A
High water absorption
B
High transpiration
C
Low transpiration
D
A and C both
Answer :
A and C both
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444.
When a cell is fully turgid which of the following will be zero
A
Turgor pressure
B
Wall pressure
C
Suction pressure
D
Osmotic pressure
Answer :
Suction pressure
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445.
Hormone produced during leaf fall is
A
IAA
B
ABA
C
Florige
D
Kinetin
Answer :
ABA
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446.
The principal pathway of water translocation in Angiosperms is
A
sieve cells
B
sieve tube elements
C
xylem vessel system
D
xylem and phloem
Answer :
xylem vessel system
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447.
In 0.1 M solution of a non electrolyte, ?w value will be
A
Zero bar
B
+2.3bar
C
-203 bar
D
-22.4 bar
Answer :
-203 bar
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448.
Humus in soil is necessary for plant growth because it
A
Increases aeration and water absorption capacity of soil
B
Makes soil compact
C
Makes soil sterile
D
Decreases rate of percolation
Answer :
Increases aeration and water absorption capacity of soil
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449.
Water potential is equal to
A
ψs + O.P
B
ψs = T.P
C
ψp + ψw
D
ψs + ψp
Answer :
ψs + ψp
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450.
Genetically dwarf plant can be converted into a plant of normal height with the application of
A
Ethylene
B
Gibberellins
C
Cytokinins
D
Auxin
Answer :
Gibberellins
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