561.
Vascular cambium forms xylem on inner side and phloem on outer side due to
A
Effect of gravity
B
Shearing force of wind
C
Intrafascicular nature
D
Differential action of hormones
Answer :
Differential action of hormones
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562.
Quiescent centre is found on
A
Root tip
B
Shoot tip
C
Floral tip
D
Leaf tip
Answer :
Root tip
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563.
Monocot root is differ from dicot root in having
A
Open vascular bundle
B
Scattered vascular bundle
C
Large pith
D
Radial vascular bundle
Answer :
Large pith
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564.
Root apex is subterminal because it is
A
Covered by root hairs
B
Covered by root cap
C
Covered by epidermis
D
Under the soil
Answer :
Covered by root cap
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565.
Which type of fibres mainly occur in phloem
A
Libriform
B
Fibre tracheids
C
Sclereids
D
Wood fibres
Answer :
Libriform
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566.
Monocot leaves possess
A
intercalary meristem
B
lateral meristem
C
apical meristem
D
mass meristem
Answer :
intercalary meristem
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567.
Procambium forms
A
only primary vascular bundles
B
only vascular cambium
C
only cork cambium
D
primary vascular bundles and vascular cambium
Answer :
only primary vascular bundles
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568.
Who proposed the 'tunica-corpus' theory
A
Hanstein
B
Nageli
C
Hofmeister
D
Schmidt
Answer :
Schmidt
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569.
Vascular bundles in Cucurbita stem are
A
Bicollateral & open
B
Bicollateral & closed
C
Collateral & open
D
Amphivasal
Answer :
Bicollateral & open
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570.
If all the lenticels of stem are blocked, the first of die will be
A
Leaves
B
Shots tips
C
Roots
D
None of the above
Answer :
Roots
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