241.
Lysigenous cavity & Y-shaped xylem occurs in
A
Dicot stem
B
Monocot root
C
Monocot stem
D
Dicot root
Answer :
Monocot stem
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242.
Which of following plant cells are without vacuoles and without nuclei
A
Cambium cells
B
Xylem vessels
C
Root hairs
D
Companion cells
Answer :
Xylem vessels
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243.
In which stem, lateral meristem is absent
A
Palm
B
Bougainvillea
C
Boerhaavia
D
Mirabilis
Answer :
Palm
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244.
Xylem translocates:
A
Water only
B
Water and mineral salts only
C
Water, mineral salts and some organic nitrogen only
D
Water, mineral salts, some organic nitrogen and hormones
Answer :
Water, mineral salts, some organic nitrogen and hormones
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245.
Duramen is
A
Sapwood
B
Heartwood
C
Bark
D
Periderm
Answer :
Heartwood
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246.
Growth of leaf primordia is
A
First apical then marginal
B
Only apical
C
Only marginal
D
Lateral
Answer :
First apical then marginal
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247.
As the secondary growth takes place (proceeds) in a tree, thickness of
A
heart wood increases
B
sap-wood increases
C
both increase
D
both remain the same
Answer :
heart wood increases
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248.
The fibres associated with phloem are known as
A
Wood fibres
B
Surface fibres
C
Bast fibres
D
Hard fibres
Answer :
Bast fibres
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249.
A tissue with spiral thickening in the cell wall capable of absorbing water from air is known as
A
Cork
B
Velamen
C
Epiblema
D
Hypodermis
Answer :
Velamen
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250.
Polyarch condition so found in
A
Monocot root
B
Dicot root
C
Monocot stem
D
Dicot stem
Answer :
Monocot root
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