Question

Refer to the given figure which represents a section of vascular bundle as seen in T.S. of a monocot stem and select the option that correctly labels A,B,C and D.

• A. A-Protoxylem vessel, B-Metaxylem vessel, C-Protoxylem cavity, D-Phloem
• B. A-Protoxylem vessel, B-Metaxylem vessel, C-Metaxylem cavity, D-Phloem
• C. A-Metaxylem vessel, B-Protoxylem vessel, C-Protoxylem cavity, D-Phloem
• D. A-Metaxylem vessel, B-Protoxylem vessel, C-Protoxylem cavity, D-Sclerenchyma

Answer 1

The correct option is C A-Metaxylem vessel, B-Protoxylem vessel, C-Protoxylem cavity, D-Phloem

The given image is a transverse section of monocot stem.

Monocot stem is characterized by presence of collateral, closed scattered vascular bundles with well developed sclerenchymatous sheath outside and no pith at the center. The sheath is termed as bundle sheath.

The vascular bundles of monocot stem have xylem towards centre and phloem towards periphery. (D- Phloem)

The xylem formed first is present near the center and is termed as protoxylem, while metaxylem is present towards the periphery. (A - Metaxylem and B- Protoxylem )

Protoxylemt cavities are present on outer side of protoxylem, which are the result of crushed outer protoxylem.( C - Protoxylem cavity).

So, the correct option is (C).