281.
The deteriorative processes in plants, that naturally terminate their functional life, are collectively called A
Wilting
B
Abscission
C
Olasmolysis
D
Senescence
Answer :
Senescence
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282.
A bottle filled with previously moistened mustard seeds and water was screw capped tightly and kept in a corner. It blew up suddenly after about half an hour. The phenomenon involved is A
diffusion
B
imbibition
C
osmosis
D
d.P.D
Answer :
imbibition
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283.
Wilting in plant occurs when A
Xylem is blocked
B
Epidermis is pealed off
C
Pith is removed
D
Phloem is blocked
Answer :
Xylem is blocked
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284.
Which is free ion present in a cell A
P
B
K
C
Fe
D
B
Answer :
K
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285.
The physical process involved in the release of molecular oxygen from leaves is A
Diffusion
B
Transpiration
C
Osmosis
D
Capillarity
Answer :
Diffusion
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286.
Nitrogenase enzyme is found in Nostoc in the cell of A
Vegetative
B
Heterocyst
C
Both vegetative and heterocyst
D
None of the above
Answer :
Heterocyst
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287.
Basis of stomatal opening is A
Exosmsis
B
Endosmosis
C
Decrease in cell sap concentration
D
Plsdmolysis of guard cells
Answer :
Endosmosis
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288.
Which of the folowing substance sere as an anti-transpirant in plant A
Phenyl mercuric acetate
B
Asprin
C
Silcon oil
D
All of the above
Answer :
All of the above
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289.
Richmond-Land effect is shown by A
Auxins
B
Sugar
C
Kinetin
D
Gibberellins
Answer :
Kinetin
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290.
Osmosis is the phenomenon expressed by A
Solutes present in the solution
B
Solution
C
Semi-permeable membrane
D
O2
Answer :
Semi-permeable membrane
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