21.
Loading of phloem is related to
A
Increase of sugar in phloem
B
Elongation of phloem cell
C
Separation of phloem parenchyma
D
Strengthening of phloem fiber
Answer :
Increase of sugar in phloem
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22.
Leaves of victoria regia are rigid due to
A
Stellate parenchyma
B
Stellate sclerenchyma
C
Osteosclereids
D
Macro sclereids
Answer :
Stellate sclerenchyma
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23.
In the dicot root the vascular cambium originates from:
A
Intrafascicular and interfascicular tissue in a ring
B
Tissue located below the phloem bundles and a portion of pericycle tissue above protoxylem
C
Cortical region
D
Parenchyma between endodermis and pericycle
Answer :
Tissue located below the phloem bundles and a portion of pericycle tissue above protoxylem
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24.
Polyarch and exarch vascular bundles are the characteristic of
A
Dicot stem
B
Dicot root
C
Monocot stem
D
Monocot root
Answer :
Monocot root
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25.
The chief water conducting elements of xylem in gymnosperms are:
A
vessels
B
fibres
C
transfusion tissue
D
tracheids
Answer :
tracheids
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26.
Which of the following is not a characteristics of the anatomy of dicotyledonous roots
A
Presence of little pith or absent
B
Radial vascular bundles
C
Presence of 15-20 vascular bundles
D
Secondary growth
Answer :
Presence of 15-20 vascular bundles
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27.
Which of the following statements is not true for stomatal apparatus?
A
Inner walls of guard cells are thick
B
Guard cells invariably possess chloroplasts and mitochondria
C
Guard cells are always surrounded by subsidiary cells
D
Stomata are involved in gaseous exchange
Answer :
Guard cells are always surrounded by subsidiary cells
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28.
Which of the following in secondary meristem
A
Protoderm
B
Procambium
C
Cork cambium
D
All of the above
Answer :
Cork cambium
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29.
Type of vascular bundles in fern roots
A
Hadrocentric
B
Lepotcentric
C
Conjoint collateral
D
Radial
Answer :
Radial
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30.
Formation of vascular rays occurs in which order
A
Centripetal
B
Centrifugal
C
Acropetal order
D
A and B both
Answer :
A and B both
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