281.
Fusiform initial forms
A
Vascular rays
B
Rays parenchyma
C
Tracheary elements
D
Primary phloem
Answer :
Tracheary elements
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282.
Which exposed wood will decay faster?
A
Sapwood
B
Softwood
C
Wood with lot of fibres
D
Heartwood
Answer :
Sapwood
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283.
Passage cells are found in
A
Monocot root
B
Monocot stem
C
Aerial root
D
Dicot stem
Answer :
Monocot root
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284.
Amount of secondary xylem as compared to secondary phloem formed every year is
A
Equal
B
8-10 times
C
Half
D
4-5 times
Answer :
8-10 times
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285.
Pith is produced by
A
Ground meristem
B
Procambium
C
Periblem
D
Dermatogen
Answer :
Ground meristem
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286.
Abnormal secondary growth is observed in
A
Dracaena
B
Wheat
C
Ginger
D
Rice
Answer :
Dracaena
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287.
Identify the incorrect statement.
A
Sapwood is involved in conduction of water and minerals from root to leaf
B
Sapwood is the innermost secondary xylem and is lighter in colour
C
Due to deposition of tannins, resins, oils etc., heart wood is dark in colour
D
Heart wood does not conduct water but gives mechanical support
Answer :
Sapwood is the innermost secondary xylem and is lighter in colour
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288.
Leaf primordium grows by
A
Apical meristem
B
Intercalary meristem
C
Mass meristem
D
Both A and B
Answer :
Both A and B
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289.
Extrastelar secondary growth takes place by
A
Vascular cambium
B
Phellogen
C
Phellogem
D
Phelloderm
Answer :
Phellogen
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290.
Which one of the following comprises only simple tissues
A
Parenchyma, Collenchyma and Sclerenchyma
B
Parenchyma, Xylem and Collenchyma
C
Parenchyma, Xylem and Sclerenchyma
D
Parenchyma, Xylem and Phloem
Answer :
Parenchyma, Collenchyma and Sclerenchyma
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