261.
Normal secondary growth takes place in
A
Dicots & Monocots
B
Gymnosperms & Monocots
C
Dicots & Gymnosperms
D
Only in dicots
Answer :
Dicots & Gymnosperms
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262.
Sieve tubes differ from sieve cells in
A
Being shorter
B
Being dead
C
Lacking nuclei
D
Having seive pores at end walls
Answer :
Having seive pores at end walls
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263.
Each annual ring consists of two strips of
A
Autumn & spring wood
B
Heart wood & sap wood
C
Xylem and phloem
D
Cork & cortex
Answer :
Autumn & spring wood
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264.
Collenchymatous hypodermis is characteristic feature of
A
Dicot stem
B
Monocot stem
C
Monocot as well as dicot stem
D
Hydrophytes
Answer :
Dicot stem
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265.
In which of the following ways parenchyma is the basic or fundamental type of tissue
A
Morphologically
B
Physiologically
C
Phylogenetically
D
All of the above
Answer :
All of the above
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266.
Casparian strip is found in
A
Epidermis
B
Endodermis
C
Endothecium
D
Endothelium
Answer :
Endodermis
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267.
Dendrochronology is the study of
A
Height of a tree
B
Diameter of a tree
C
Age of a tree with the help of annual rings
D
Counting of the number of branches
Answer :
Age of a tree with the help of annual rings
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268.
Which is not correct about heartwood
A
It is formed of living cells
B
It contains resins, tannin and other organic contents
C
It is of dark colour
D
It lies in the centre region
Answer :
It is formed of living cells
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269.
Secondary growth is absent in
A
Hydrophytes
B
Mesophytes
C
Halophytes
D
Xerophytes
Answer :
Hydrophytes
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270.
Tunica-corpus theory was given by
A
Schmidt
B
Hanstein
C
Karl Nageli
D
Schuepp
Answer :
Schmidt
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