511.
Youngest layer of secondary xylem is located
A
In centre of stem
B
Just outside pith
C
Just outside vascular cambium
D
Just inside vascular cambium
Answer :
Just inside vascular cambium
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512.
Hard, lignified, thick, walled, long and pointed cells in plants are
A
Parenchyma
B
Sclerenchymatous fibre
C
Collenchyma
D
Sclereids
Answer :
Sclerenchymatous fibre
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513.
The cork cambium, cork and secondary cortex are collectively called:
A
phelloderm'
B
phellogen
C
periderm
D
phellem
Answer :
periderm
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514.
Endodermis mainly
A
Acts as water right jacket
B
Provides protection
C
Maintains rigidity
D
Help in transpiration
Answer :
Acts as water right jacket
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515.
Wood is the common name of
A
Phloem
B
Vascular bundles
C
Cambium
D
Secondary xylem
Answer :
Secondary xylem
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516.
What happens to primary phloem in stem after sec growth
A
Compresses outside and degenerates
B
Compress inside and degenerates
C
Becomes part of sec phloem
D
Modifies in sclerenchyma
Answer :
Compresses outside and degenerates
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517.
Laticifierous vessels are found in
A
Xylem tissue
B
Phloem tissue
C
Cortex
D
None of the above
Answer :
Cortex
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518.
Bicollateral vascular bundles are found in
A
Malvaceae
B
Cucurbitaceae
C
Lillaceae
D
Poaceae
Answer :
Cucurbitaceae
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519.
Stele consists of
A
Phloem
B
Xylem
C
Pericycle
D
All of the above
Answer :
All of the above
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520.
When tree grows older which increase rapidly in thickness
A
Its heart wood
B
It's sap wood
C
Cortex
D
Phloem
Answer :
Its heart wood
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