341.
Casparian strips occur in
A
Longitudinal and radial walls of epidermal cells
B
Longitudinal walls of xylem
C
All walls of endodermis
D
Radial and tangential walls of endodermis
Answer :
Radial and tangential walls of endodermis
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342.
When protoxylem faces pericycle, it is called
A
Endarch
B
Mesarch
C
Exarch
D
Polyarch
Answer :
Exarch
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343.
Gymnosperm wood is non porous because it
A
Lacks vessels
B
Contains tracheae
C
Has abundant fibres
D
Contains no fibres
Answer :
Lacks vessels
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344.
Leaves of grasses roll and unroll due to
A
Hormonal change
B
Change in temperature
C
Change in turgor pressure
D
Presence of bulliform apparatus
Answer :
Presence of bulliform apparatus
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345.
Complementary cells of lenticels are
A
Compact and suberised
B
Loose and non suberised
C
Compact and lignified
D
Loose and lignified
Answer :
Loose and non suberised
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346.
In plants, which of the following would most likely show totipotency
A
Xylem Vessels
B
Meristem
C
Cork
D
Sieve tube
Answer :
Meristem
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347.
A mature sieve tube differs from a vessel
A
In lacking a functional nucleus
B
Absence of lignified walls
C
Being nearly dead
D
Lacking cytoplasm
Answer :
Absence of lignified walls
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348.
As compared to a dicot root, a monocot root has
A
many xylem bundles
B
relatively thicker periderm
C
inconspicuous annual rings
D
more abundant secondary xylem
Answer :
many xylem bundles
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349.
The function of vessel is
A
Conduction of food
B
Conduction of water and minerals
C
To help in transpiration
D
To help in respiration
Answer :
Conduction of water and minerals
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350.
A nectar-secreting gland cell characteristically contains
A
Granular cytoplasm filling the cell and a small nucleus
B
Granular cytoplasm living a central vacuole and a small nucleus
C
Granular cytoplasm filling the cell and a large conspicuous nucleus
D
Vacuolated cytoplasm but with a large nucleus
Answer :
Granular cytoplasm filling the cell and a large conspicuous nucleus
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