In monocot plants,the 'girdling experiment' does not yield any results due to:

Match the following:

Column-$I$	Column-$II$
$(1)$ Monocot stem	$(a)$ Bulliform cells
$(2)$ Monocot root	$(b)$ Casparian strips
$(3)$ Monocot leaf	$(c)$ Polyarch xylem bundles
	$(d)$ Vascular bundles conjoint and closed

Find the statement that is $\text{NOT}$ correct with regard to the structure of monocot stem.

$A$ transverse section of a plant part shows the following characteristics:
$(a)$ Numerous,scattered vascular bundles,each surrounded by a bundle sheath.
$(b)$ $A$ large,conspicuous parenchymatous ground tissue.
$(c)$ Conjoint and closed vascular bundles.
$(d)$ Absence of phloem parenchyma.
Identify the type of plant and the part:

The vascular bundles in the stems of most of dicots are conjoint,collateral and open. In each of these bundles

If the protoxylem is towards the center and the metaxylem is towards the periphery,the arrangement of xylem is called $.........$.