161.
Cork is formed from
A
cork cambium (phellogen)
B
vascular cambium
C
phloem
D
xylem
Answer :
cork cambium (phellogen)
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162.
At maturity which of the following is enucleate?
A
Sieve cell
B
Companion cell
C
Palisade cell
D
Cortical cell
Answer :
Sieve cell
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163.
How many histogens are present in Casuarina root apex
A
Four
B
One
C
Three
D
Two
Answer :
Two
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164.
The wood of commerce is
A
Alburnum
B
Duramen
C
Spring wood
D
Autumn wood
Answer :
Duramen
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165.
Grafting is not possible in monocots because they
A
Lack cambium
B
Have scattered vascular bundles
C
Have parallel venation
D
Are herbaceous
Answer :
Lack cambium
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166.
The chief function of a vessel in a plant body is to
A
Conduct sap
B
Conduct mineral salts only
C
Eliminate excess of water at right
D
Translocate organic nutrients
Answer :
Conduct sap
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167.
Girth of dicot stem increases by the activity of
A
Apical meristem
B
Intercalary meristem
C
Lateral meristem
D
Procambium meristem
Answer :
Lateral meristem
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168.
The cells are chlorophyll us, fewer in number unique in shape and inner walls thick. The description fits into
A
Guard cells
B
Subsidiary cells
C
Passage cells
D
Bulliform cells
Answer :
Guard cells
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169.
Periderm is formed from
A
Vascular cambium
B
Phellogen
C
Fascicular cambium
D
Interfascicular cambium
Answer :
Phellogen
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170.
Tyloses thickenings are seen in
A
Phloem cells
B
Ray parenchyma only
C
Collenchyma
D
Ray parenchyma and xylem cells
Answer :
Ray parenchyma and xylem cells
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