91影视

Roots are the axis of the plant that grows in the opposite direction from the stem, maintaining the plant's position and absorbing nutrients. The root hairs are carried by the piliferous stratum, a group of cells on the outer layer. The pith is protected by the cortex, which is a component of the root.

The sclerenchyma cells are the bundles or strands found in a tree's roots, leaves, and stems. Sclerenchyma cells are stiff, thick-walled cells with no protoplasm, closely packed with no intercellular space observed in the root cortex during the cross-section of roots.

Thus, sclerenchyma cells are seen in a cross-section of the woody part of the roots.

Therefore, the given option is incorrect.

The parenchyma cells form the pith region in the innermost layers of the roots. The parenchyma cells are oval or spherical; these cells are large and not packed closely. The intercellular spaces between the cells are present.

Thus, the parenchyma cells are present when the cross-section of the woody roots is observed.

Therefore, the given option is incorrect.

The sieve tube elements are the phloem components, the vascular tissue that carries food from leaves to all the plant parts. In roots, the sieve tube elements are connected in vertical rows to the sieve tube.

A phloem part is observed in the cross-section of roots that includes the sieve tubes and sieve tube elements.

Thus, sieve tube elements are seen in the cross-section of the woody root.

Therefore, the given option is incorrect.

The root hairs are long extensions on the plant roots that grow as an extension of the epidermal cell of a root. These are the lateral extensions and are rarely branched.

The main role of the root hairs is to absorb the nutrients and minerals from water and soil. Thus these are the external appendages and are very minute in size.

Thus, root hairs are not seen in the cross-section of a woody root.

Therefore, the given option is correct.