Question

What is the characteristic of a vascular bundle of monocot stem?
A. Open and surrounded by a sclerenchymatous bundle sheath
B. Closed and not surrounded by bundle sheath
C. Closed and surrounded by bundle sheath
D. Open and not surrounded by a bundle sheath

Answer 1

Hint: A vascular bundle is a part of the transport system in vascular plants. The transport itself happens in vascular tissue, which exists in two forms: xylem and phloem. Monocot stems are protected by an outer layer of dermal tissue called the epidermis. The rest of the stem is made up of ground tissue and vascular tissue.

Complete answer:
-Many monocots have hollow stems.
-They have 'closed' bundles that lack the cambium.
-Monocots usually have collateral vascular bundles, a type that is also called closed.
-The vascular bundle is enclosed by a bundle sheath of parenchyma cells in the cortex region.
-Monocot stems have most of their vascular bundles near the outside edge of the stem.
-There is no pith region in monocots.
So, the answer is C. Closed and surrounded by bundle sheath
Additional information:
The bundle-sheath cells are the photosynthetic cells arranged into a tightly packed sheath around the vein of a leaf. It forms a protective covering on the leaf vein and consists of one or more cell layers, usually parenchyma. Loosely arranged mesophyll cells lie between the bundle sheath and the leaf surface. The Calvin cycle is confined to the chloroplasts of these bundle sheath cells in C4 plants.

Note: Phloem and xylem are present in a vascular bundle, which in addition includes supporting and protective tissues. Monocots usually don't have secondary growth. Some, such as bamboo and palm trees, have secondary growth. Monocot secondary growth differs from dicot secondary growth in that new bundles are formed at the edge of the stem. These new bundles are close together, providing support for the stem.