291.
Heartwood differs from sapwood in:
A
presence of rays and fibres
B
absence of vessels and parenchyma
C
having dead and non-conducting elements
D
being susceptible to pests and pathogens
Answer :
having dead and non-conducting elements
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292.
Periderm is produced by
A
Vascular cambium
B
Fascicular cambium
C
Phellogen
D
Intrafascicular cambium
Answer :
Phellogen
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293.
Lenticels do not occur on
A
Stem
B
Root
C
Leaf
D
Fruit
Answer :
Leaf
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294.
Hard, lignified, thick-walled, long and pointed cells constitut
A
Parenchyma
B
Collenchyma
C
Sceleids
D
Sclerenchyma
Answer :
Sclerenchyma
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295.
The apical meristem of the root is present
A
in all the roots
B
only in radicals
C
only in tap roots
D
only in adventitious roots
Answer :
in all the roots
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296.
Meristems are
A
Permanent cells
B
Dividing cells
C
Mechanical cells
D
None of the above
Answer :
Dividing cells
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297.
Totipotency is present in
A
Meristem
B
Xylem
C
Phloem
D
Cork
Answer :
Meristem
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298.
Which of the following provide maximum mechanical strength to a tree trunk
A
Heart wood
B
Sap wood
C
Cork
D
Late wood
Answer :
Heart wood
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299.
In monocots, roots cap is formed by
A
Dermatogen
B
Calyptrogen
C
Wound cambium
D
Vascularcambium
Answer :
Calyptrogen
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300.
In older woody tissue, the gaseous exchange takes place through
A
Lenticel
B
Hydathode
C
Stomata
D
Aerenchyma
Answer :
Lenticel
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