Question

Transverse section of a part of a typical monocotyledonous root has been shown in the figure. Identify the different parts.
A: A –Root hair, B- Epiblema, C: Cortex, D- Endodermis, E- Pericycle, F- Pith, G- Phloem, H- Metaxylem, I- Protoxylem.
B: A – Root hair, B- Epiblema, C-Cortex, D – Pericycle, F – Pith, G – Phloem, H- metaxylem, I – protoxylem.
C: A- Root hair, B- Epiblema, C- cortex, D- Pericycle, F- Pith, G – Phloem, H- metaxylem, I- protoxylem.
D : A –Root hair, B- Cortex, C –Epiblema, D – Pericycle, E – Endodermis, F – Passage cell, G- protoxylem, H –Phloem, I- Metaxylem.

Answer 1

Monocotyledons are the seeds that typically contain one embryonic cotyledon. All grains, daffodils, and bananas are few examples of monocot root. The internal structure includes from root hair to metaxylem. Root hair – Epiblema- cortex- endodermis- pericycle- pith-phloem-metaxylem- protoxylem.

Complete answer:
Root hair is the single celled structure developed from epidermis or epiblema cell.
Epiblema is the outermost layer with no intercellular spaces. Epiblema and root hairs are without cuticles. It absorbs water and mineral salt. Just below epiblema lies the cortex, it is thin walled multilayered parenchymal cells.
Cortex helps in the storage of food and protection of endodermis.
Endodermis is the innermost layer of the cortex. It is a barrel shaped compact cell without spaces. It regulates flow both water inwards and outward.
Pericycle is just below endodermis and composed of single layered sclerenchymatous cells.
The central parenchymatous tissue includes the pith. Xylem and phloem include the vascular system.
After pith, phloem, metaxylem, protoxylem respectively. It helps in storage of food and mechanical support.
The alternating strends of xylem and phloem contains the vascular tissue. The vascular is more than six hence, it is known as polyarch and exarch.

Hence, the correct answer is option (A).

Note: Monocot is the roots that typically contain one embryonic cotyledon. It helps in the absorption of water and organic compounds. The transverse section of monocotyledon is Root hairs –Epiblema – cortex- endodermis – pericycle- pith – phloem-metaxylem –protoxylem.