Question

Vascular bundles of the root are described as

• A. radial and exarch
• B. conjoint and endarch
• C. radial and endarch
• D. conjoint and exarch

Answer 1

The correct option is A radial and exarch

Vascular bundles in the root are radial and exarch.
In radial arrangement, xylem and phloem are present in an alternate manner along different radii.
In exarch condition, the protoxylem is towards the periphery and the metaxylem is towards the centre. It is found in roots.

The xylem formed during primary growth in plants is called primary xylem. It includes protoxylem and metaxylem.
The first formed primary xylem with narrow vessels is called protoxylem.
The later formed primary xylem with wide vessels is called metaxylem.

Conjoint and endarch condition is seen in stems.
When xylem and phloem are present on the same radius, it is called conjoint.
In endarch condition, the protoxylem is towards the centre and metaxylem is towards the periphery.