421.
Annual rings are the bands of
A
Secondary cortex and cork
B
All secondary vascular tissue
C
Secondary xylem and xylem rays
D
Secondary phloem and medullary rays
Answer :
Secondary xylem and xylem rays
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422.
An organised and differentiated cellular structure having cytoplasm but no nucleus is
A
Vessels
B
Xylem parenchyma
C
Sieve tubes
D
Tracheids
Answer :
Sieve tubes
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423.
Tissue which develops more due to scarcity of water
A
Scelenchyma
B
Collenchyma
C
Parenchyma
D
Meristem
Answer :
Scelenchyma
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424.
In dicot Root
A
Vascular bundles are scattered with cambium
B
Vascular bundles are open and arranged in a ring
C
Xylem and phloem are radial
D
Xylem is always endarch
Answer :
Xylem and phloem are radial
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425.
What is true about a monocot leaf?
A
Reticulate venation
B
Absence of bulliform cells from epidermis
C
Mesophyll not differentiated into palisade and spongy tissues
D
Well differentiated mesophyll
Answer :
Mesophyll not differentiated into palisade and spongy tissues
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426.
Meristematic tissue in vascular bundle is
A
Phellem
B
Procambium
C
Interfascicular cambium
D
Fascicular cambium
Answer :
Fascicular cambium
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427.
A common structural feature of vessel elements and sieve tube elements are
A
pores on lateral walls
B
presence of p-protein
C
enucleate condition
D
thick secondary walls
Answer :
enucleate condition
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428.
A tissue is a group of cells which are
A
Similar in origin, but dissimilar in form and function.
B
Dissimilar in origin, form and function.
C
Dissimilar in origin, but similar in form and function.
D
Similar in origin, form and function
Answer :
Similar in origin, form and function
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429.
In a hollow stem, what is most affected
A
Conduction of food
B
Conduction of water
C
Storage of food
D
None of the above
Answer :
None of the above
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430.
Quiescent centre is found in
A
Leaf tip
B
Shoot tip
C
Root tip
D
Flower
Answer :
Root tip
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