- b
- (d) Tissues are classified based on the structure
and position/location. - (b) 39. (a)
- (b) Cambium has the ability to differentiate and
helps in secondary growth. - (b)Suberin is a waterproofing waxy substance
found in higher plants. Suberin is a main
constituent of cork, and is named after the cork
oak. - (c)Actively dividing cells are made up of dense
protoplasm and no lacuna. - (b)Companion cells of gymnosperms are called
as albuminous cells, which is present associated
with the sieve tube cell. - (d) Intussusception is the expansion of the cell
wall in plants as a result of the introduction of
new molecules of cellulose and protopectin into
the already formed wall. - (b)
46. (b) Vessels of xylem are devoid of nucleus.
47. (b) 48. (a) 49.(b)
50. (b)
51. (d) Submerged hydrophytes are completely
present inside water hence they do not have
stomata.
52. (d) Cambium-interfascicular and intrafascicular
cambium bring about the secondary growth
helpful in increasing the growth of the girth of the
plant.
53. (d) 54. (d) 55. (c)
56. (d) For the successful union of the two plants
in grafting is the production of secondary xylem
and phloem for the new vascular cambium in the
callus bridge. Callus plays an important role in
uniting stock and scion.
57. (d) 58. (d) 59. (c)
60. (a) 61. (d)
ff
(ff)
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