461.
Lenticels and hydathodes are small pores with which of the following common attributes
A
They allow exchange of gases
B
Their opening and closing is not regulated
C
They always remain closed
D
They are found on the same organ
Answer :
Their opening and closing is not regulated
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462.
From which part of Cocos nucifera, coir is obtained
A
Endocarp
B
Mesocarp
C
Epicarp
D
Any part of fruit
Answer :
Mesocarp
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463.
Which of the following is not adaptation of Xerophytes
A
Spongy tissue
B
Well developed mechanical tissue
C
Well developed vascular tissue
D
Thick cuticle
Answer :
Spongy tissue
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464.
Which would do maximum harm to a tree
A
Loss of half of its leaves
B
Loss of half of its branches
C
Loss of all of its leaves
D
Loss of all its bark
Answer :
Loss of all its bark
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465.
Safranin stains which element of tissue
A
Starch
B
Lignin
C
Protein
D
Cutin
Answer :
Lignin
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466.
Vascular cambium produces
A
primary xylem and primary phloem
B
secondary xylem and secondary phloem
C
primary xylem and secondary phloem
D
secondary xylem and primary phloem
Answer :
secondary xylem and secondary phloem
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467.
The term "Leptom" refers to
A
Soft walled conducting part of the phloem
B
None conducting part of phloem
C
Conducting part of xylem
D
Non-conducting part of xylem
Answer :
Soft walled conducting part of the phloem
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468.
Outer layer of bark is
A
Epidermis
B
Rhytidome
C
Phelloderm
D
Lenticel
Answer :
Rhytidome
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469.
Thickness of stem increases due to activity of
A
Cambium
B
Xylem
C
Phloem
D
Shoot apex
Answer :
Cambium
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470.
Fibre (longest plant cell), belongs to which tissue
A
Parenchyma
B
Collenchyma
C
Scelernchyma
D
Aerenchyma
Answer :
Scelernchyma
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