Question

Are vascular bundles closed in Monocotyledons?

Answer 1

In vascular plants, a vascular bundle is a component of the transport system. The transport occurs in the stem, which is divided into two types: xylem and phloem.

Complete answer:
Xylem and phloem are two types of xylem. Both of these issues can be found in a vascular bundle, which also contains supporting and protective tissues. In addition, there is a tissue called the cambium that lies between the xylem and the phloem.
The xylem usually runs parallel to the axis (adaxial), while the phloem runs perpendicular to the axis (abaxial). This means that in a stem or root, the xylem is closer to the center, while the phloem is closer to the outside. The upper side of a leaf is usually the adaxial surface, while the lower side is the abaxial surface.
The phloem, which is closer to the lower surface, transports the sugars synthesized by the plant with the help of sunlight. By tapping into the phloem, aphids and leafhoppers can feed on these sugars. This explains why aphids and leafhoppers prefer to live on the underside of leaves rather than the top.

Thus, Yes. Monocotyledons have closed vascular bundles due to the lack of cambium in their vascular bundles. As a result, they don't produce secondary tissues.

Note:
Photosynthetic cells arranged in a tightly packed sheath around a leaf vein are known as bundle-sheath cells. It is made up of one or more cell layers, usually parenchyma, and forms a protective covering on leaf veins. Between the bundle sheath and the leaf surface are loosely arranged mesophyll cells.