Question

Name the anatomical layer in the root from which the lateral branch of root arises.

Answer 1

The pericycle is parenchyma in shape of cylinder or sclerenchyma cells which are present inner to the endodermis and is also the outermost section of the stele.

Complete answer:
The pericycle is an anatomical layer present in the root which gives rise to lateral branches of root. It is the cell which consists of parenchyma or sclerenchyma. It is present inside the region of endodermis and outer section of the stele part. The lateral roots are produced when the cells of the pericycle start to divide and form an additional layer of cells. There is a push through outer cell layers present in the primary root, and this ultimately organises to form a root meristem. As the lateral roots are initiated in pericycle and then grow out through the epidermis and cortex, they have an internal or endogenous origin, while in contrast to the external, or exogenous, origin of leaves and the apical meristem of stems.
The pith or medulla is a tissue present inside the stems of the vascular plants. The pith is composed of parenchyma cells that are known to store and transport the nutrients to different plant parts. In case of dicotyledons, the pith is present in the centre of the stem. While in case of the monocotyledons pith extends into flowering stems as well as roots.

Note: The pericycle is a type of primary tissue which maintains meristematic activity and is known to be involved in lateral root development and in secondary root growth activity.