Which of the following characters are not applicable to the anatomy of dicot stem?
(a) Collenchymatous hypodermis
(b) Polyarch xylem
(c) Presence of casparian strips on endodermis
(d) Open vascular bundle
(e) Presence of medullary rays.
Which of the following characters are not applicable to the anatomy of dicot stem?
(a) Collenchymatous hypodermis
(b) Polyarch xylem
(c) Presence of casparian strips on endodermis
(d) Open vascular bundle
(e) Presence of medullary rays.
The correct option is E b and c only
a) Collenchymatous hypodermis -applicable because hypodermis is made up of collenchyma.
b) Polyarch xylem – not applicable, because, xylem and phloem are present on the same radius and side by side. It is found in monocot roots.
c) Presence of Casparian strips on endodermis – not applicable, because Casparian strips appear on the radial and tangential walls of the endodermis of roots.
d) Open vascular bundle – applicable, because, cambium is present between the xylem and phloem in the vascular bundles.
e) Presence of medullary rays – applicable – because, these are the extensions of medulla between the vascular bundles.
So, the correct option is ‘b and c’.
a) Collenchymatous hypodermis -applicable because hypodermis is made up of collenchyma.
b) Polyarch xylem – not applicable, because, xylem and phloem are present on the same radius and side by side. It is found in monocot roots.
c) Presence of Casparian strips on endodermis – not applicable, because Casparian strips appear on the radial and tangential walls of the endodermis of roots.
d) Open vascular bundle – applicable, because, cambium is present between the xylem and phloem in the vascular bundles.
e) Presence of medullary rays – applicable – because, these are the extensions of medulla between the vascular bundles.
So, the correct option is ‘b and c’.
