A plant root is an example of

A plant root is an example of an ORGAN.

Explanation:

Organ consist of specialized cells that come together to perform similar function.

Plants have different organs which are leaves, stems, and reproductive organs which perform specialized functions.

Leaves, stems and roots are vegetative organs of the plants while flowers,seeds and fruits are reproduce structures.

Roots help to anchor the plant to the soil, they absorb nutrients and water and transport them to the stem.

it has one origin of replication, but it proceeds in two directions - d)