Question

Water containing cavities in vascular bundles are found in?
A. Sunflower
B. Maize
C. Cycas
D. Pinus

Answer 1

Hint: In monocot stem, the vascular bundles are conjoint, collateral, and closed. This means that the lowermost protoxylem vessels and xylem parenchyma cells dissolve that forms water containing the schizolysigenous cavity known as protoxylem cavity or lacuna or lysigenous cavity.

Complete answer:
> Option A- sunflower
Sunflower also known as Helianthus annuus, is a large annual form of the genus Helianthus. It is grown as a crop for its edible oil and edible fruits.

> Option B- maize
Maize is also known as corn. Their leafy stalk produces pollen inflorescences and separate ovuliferous inflorescences known as ears that yield kernels or seeds, which are fruits.

> Option C- cycas
Cycas is a genus of plants that belongs to a very ancient lineage called the Cycadophyta. They are not closely related to palms, ferns, trees, or any other modern group of plants.

> Option D- pinus
A pine is any conifer in the genus Pinus and family Pinaceae. Pinus is the sole genus belonging to the subfamily Pinoideae.

Hence, the correct answer is option (B).

Note: In monocot stem, vascular bundles are oval-shaped in which xylem and phloem are present on the same radii, and side by side. Therefore, they are also called Collateral and Conjoint vascular bundles. In the vascular bundles, cambium is absent between xylem and phloem and is known as closed vascular bundles. In the xylem, the protoxylem is towards the center, and the metaxylem is towards the periphery and known as an endarch xylem. In the protoxylem, some of the cells disintegrate to form into the lysigenous cavity known as Protoxylem lacuna. eg: Maize.