111.
Sieve tubes are characterized by
A
Absence of septa
B
Simple oblique septa
C
Perforated longitudinal walls
D
Perforated oblique septa
Answer :
Perforated oblique septa
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112.
In the T.S. of root
A
Protoxylem and metaxylem are not present on same radius
B
Protoxylem is absent
C
Protoxylem towards inside and metaxylem towards outside
D
Metaxylem is towards inside and protoxylem towards outside
Answer :
Metaxylem is towards inside and protoxylem towards outside
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113.
Bast fibres are mostly found in
A
Secondary xylem
B
Secondary phloem
C
Primary phloem
D
Primary xylem
Answer :
Secondary phloem
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114.
Rod-like elongated slereids in the seed-coats of pulses are called
A
Astroclereids
B
Macrosceleids
C
Trichosclereids
D
Branchyclereids
Answer :
Macrosceleids
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115.
Innumerable vascular bundles, lack of cambium and lack of a well demarcated pith is found in
A
Sugarcane
B
Sunflower
C
Radish
D
Pea
Answer :
Sugarcane
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116.
Transition of exarch bundles of root or endarch bundles of stem occurs in
A
Epicotyl
B
Hypocotyl
C
Apical bud
D
Coleoptile
Answer :
Hypocotyl
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117.
Amphivasal vascular bundles are found in
A
Cycas and Dryopteris
B
Dracaena and Yucca
C
Helianthus and Cucurbita
D
Maize and wheat
Answer :
Dracaena and Yucca
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118.
Tyloses occur in
A
Secondary xylem
B
Secondary phloem
C
Callus tissue
D
Cork cells
Answer :
Secondary xylem
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119.
For a critical study of secondary growth in plants, which one of the following pairs is suitable
A
Wheat and maiden hair fern
B
Sugarcane and sunflower
C
Teak and pine
D
Deodar and fern
Answer :
Teak and pine
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120.
A narrow thin - walled cells with large nucleus and lying on the side of sieve tube is absent in
A
Angiosperms
B
Pteriodophytes
C
Gymnosperms
D
Both B and C
Answer :
Both B and C
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