Answer:
(a) Exarch Protoxylem
EndarchProtoxylem
When the protoxylem is
present towards the periphery and metaxylem towards centre in vascular bundle
as it is found in roots.
If the protoxylem is present
towards the centre and metaxylem towards periphery in the vascular bundle as
it is found in stem.
(b) Stele
Vascular Bundle
Stele refers to conducting
tissue or the central part of root or stem in plants. It comprises of
vascular tissue, ground tissue and pith and limiting boundaries, i.e.,
endodermis and pericycle.
Vascular bundle comprises of
vascular/conducting tissues xylem and phloem. Some times cambium is also
included as in dicots.
(c) Protoxylem
Metaxylem
It is the first or earlier
formed xylem. Matures before the growth and differentiation of plant organs.
Protoxylem elements are smaller in diameter. Tyioses absent in protoxylem
vessels. Fibres are absent.
It is the later formed xylem.
Matures after the growth and differentiation of plant organs. Metaxylemd elements
are broader and greater in diameter. Tyioses are generally present. Fibres
may be present.
(d) Intra fascicular
Cambium
Inter fascicular Cambium
Cambium present in between
the primary xylem and primary phloem is called-intra fascicular cambium, as
in dicot stems.
The cambium present in
between the two vascular bundles making the cambium continuous and forming a
complete ring of cambium is called interfascicularconbium.
(e) Open Vascular Bundle
Closed Vascular Bundle
Cambium present in between
the phloem tissue.
Intra fascicular cambium
between the present.
Occur in the stems of nd
gymnosperms.
May be al or bicolateral.
Xylem and not in direct
contact with her due to cambial string.
Intra fascicular cambium
results in secondary growth.
Cambial activity secondary
phloem and secondary xylem that push primary phloem and primary xylem away
from each other.
Cambium is not present in
between the xylem and phloem tissue.
Intrafascicular cambium
absent. Occur in leaves and monocot stems.
May be collateral or
concentric.
Xylem and phloem are in
direct contact due to back of cambial string. No such activity found.
No such activity found.
(f)Root Hair
Stem Hair
Root hairs are unicellular
It increase the
surface area of root for absorption of
water and minerals.
Stem hairs are
multicellular
They are epidermal outgrowths known as trichomes.
They help in preventing water loss due to
transpiration.
You need to login to perform this action.
You will be redirected in
3 sec