51.
When stomata opan , the pH of guard cells
A
Increases
B
Decreases
C
Remains same
D
Both A and B
Answer :
Increases
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52.
Guard cells differ from other epidermal cells in having
A
Large vacuoles
B
Secondary walls
C
Chloroplast with PEP- carboxylase enzyme
D
Absence of mitochondria
Answer :
Chloroplast with PEP- carboxylase enzyme
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53.
The translocation of organic solutes in sieve tube members is supported by
A
P-proteins
B
mess flow involving a carrier and ATP
C
cytoplasmic streaming
D
root pressure and transpiration pull
Answer :
P-proteins
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54.
The real foresee responsible for the movement of water from cell to cell is
A
OP
B
TP
C
DPD
D
WP
Answer :
DPD
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55.
The pigment sensitive for red far red light is
A
Chlorophyll
B
Phytochrom
C
Cytochrome
D
Carotene
Answer :
Phytochrom
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56.
Opening os stomata is due to
A
Turgidity of guard cells
B
Size of guard cells
C
Number of guard cells
D
Amount of CO2 in the atmosphere
Answer :
Turgidity of guard cells
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57.
Plants absorb carbon dioxide from
A
Millets
B
Cereals
C
Carbohydrates present in the soil
D
Atmosphere
Answer :
Atmosphere
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58.
In fully cell
A
DPD=WP
B
DPD=OP
C
DPD=OP-TP
D
DPD=0
Answer :
DPD=0
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59.
The right sequence for imbibition is
A
Agar agar > cellulose >protein
B
Protein >cellulose >agar agar
C
Agar agar> protein <>cellulose
D
Agar agar < protein < cellulose
Answer :
Agar agar> protein <>cellulose
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60.
Passive absorption ot water takes place by
A
Osmosis
B
The presence of energy
C
Root pressure
D
Transpiration pull
Answer :
Transpiration pull
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