Anatomy of Flowering Plants Test - 87

In the vascular bundles, xylem and phloem are present on different radii are called radial vascular bundles. These are found in dicot roots and monocot roots.

A.Bast fibres – produced from the vascular cambium towards outerside

B.Sieve tubes – produced from procambium towards outerside.

C.Wood fibres – produced from the vascular cambium towards innerside.

D.Companion cell – produced from procambium towards outerside.

A.Endodermis - Inner most layer of cortex

B.Epidermis – outer layer of organs.

C.Exodermis – outer most layer of mature monocot root.

D.Hypodermis – it is present inner to the epidermis in stems.

• Dicot stem – collateral, conjoint, endarch, open vascular bundles present in the form of rings.
• Monocot stem – collateral, conjoint, endarch, closed vascular bundles present in the form of the scattered manner in a ground tissue.
• Dicot root – radial vascular bundles are present.
• Monocot root – radial vascular bundles are present.

In dicot root, radial vascular bundles, with little pith appears, secondary growth also takes place.

Monocot root vascular bundles are radial in the arrangement. There are eight types of bundles each of xylem and phloem. Thus the condition is described as the polyarch. Xylem is detailed as an exarch.

Monocot stem vascular bundles are many in number and the xylem is the endarch.

Dicot stem vascular bundles are also eight in number but arranged in the form of a broken ring. The vascular bundles are conjoint, collateral and open. Xylem is on the inner surface and phloem on the outer surface. Xylem is described as an endarch.

Dicot root vascular bundles are described as radial and tetrarch. There are four bundles each of xylem and phloem occurring alternately. Xylem is described as an exarch.

So, the correct answer is 'Monocot root'

So, the correct answer is B.

A. Epiblema – root epidermis with root hairs is called epiblema

B. Pericycle – outer most part of the stele in roots and dicot stem, produces lateral branches

C. Cortex – middle of root and dicot stem internally

D. Endodermis – inner most part of the cortex

Development of xylem from the periphery to the centre is called centripetal xylem. It is found in roots.

A.Bicollateral closed vascular bundles – Not present in any plants

B.Bicollateral open vascular bundles – found in the stems of Cucurbitaceae members

C.Collateral open vascular bundles – found in the dicotyledonous stems.

D.Collateral closed vascular bundles – found in the monocotyledonous stems.