171.
Plants die from prolonged water-logging because
A
soil nutrients become very dilute
B
root respiration stops
C
cell sap in the plants becomes too dilute
D
nutrients leach down due to excess water
Answer :
root respiration stops
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172.
Guttation takes place through
A
Lenticels
B
Pneumatophores
C
Stomata
D
Hydahodes
Answer :
Hydahodes
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173.
The closure of lid of pitcher in a pitcher plant, is due to
A
turgor movement
B
tropic movement
C
paratonic movement
D
autonomous movement
Answer :
paratonic movement
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174.
Maximum transpiration is taking place through the
A
Stomata
B
Lenticel
C
Hydathode
D
Cuticle
Answer :
Stomata
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175.
Relay pump theory of ascent of sap was proposed by
A
Bose
B
Godlewsky
C
Westermaier
D
Von sachs
Answer :
Godlewsky
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176.
Osmotic potential (ΨS) of a solution is always
A
Positive
B
Negative
C
Zero
D
Variable
Answer :
Negative
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177.
Hydroponics is a technique in which plants are grown in
A
Green house
B
Water saturated sand
C
Balanced nutriednt solution
D
Purified distilles water
Answer :
Balanced nutriednt solution
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178.
Which of the following is produced during water stress condition
A
Cytoknin
B
ABA
C
Phytochrome
D
ATPase
Answer :
ABA
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179.
Which of the plants can absorb water in the form of vapour from its atmosphere
A
All xerophytes
B
Low transpiring cacti
C
Succulents plants
D
Epiphytes & Lichen
Answer :
Epiphytes & Lichen
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180.
Pulsation theory to explain ascent of sap in Desmodium was proposed by
A
Dixxon and Jolly
B
Curits
C
J.C.Bose
D
None of the above
Answer :
J.C.Bose
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