A bicollateral vascular bundle has the following arrangement of tissues .................
- Outer Phloem - Outer Cambium - Middle Xylem - Inner Cambium - Inner Phloem
- Outer Xylem - Outer Cambium - Middle Phloem - Inner Cambium - Inner Xylem
- Outer Phloem - Outer Xylem - Middle Cambium - Inner Xylem - Inner Phloem
- Outer Cambium - Outer Phloem - Middle Xylem - Inner Phloem - Inner Cambium
The Correct Option is A
Approach Solution - 1
Approach Solution -2
Explanation:
A bicollateral bundle is a vascular bundle that has a phloem on both the inner and peripheral sides of the xylem.
- Between the peripheral phloem and xylem is a strip of cambium known as the outer cambium.
- Between the inner phloem and xylem is another strip of cambium known as the inner cambium.
- The term "internal" refers to the phloem, whereas "peripheral" refers to the interior or peripheral phloem.
- The bicollateral bundles' vascular tissues are arranged as follows: outer phloem, outer cambium, xylem, inner cambium, and inner phloem, going from periphery to center.
Examples: Cucurbitaceae and Solanaceae.
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Concepts Used:
The Tissue System
Epidermal Tissue System:
The epidermal tissue system forms the outer-most covering of the whole plant body and comprises epidermal cells, stomata, and the epidermal appendages – the trichomes and hairs. The epidermis is the outermost layer of the primary plant body. It is made up of elongated, compactly arranged cells, which form a continuous layer. The epidermis is usually single-layered.
Ground Tissue System:
All tissues except the epidermis and vascular bundles constitute the ground tissue. It consists of simple tissues such as parenchyma, collenchyma, and sclerenchyma. Parenchymatous cells are usually present in the cortex, pericycle, pith, and medullary rays, in the primary stems and roots. In leaves, the ground tissue consists of thin-walled chloroplast-containing cells and is called mesophyll.
Vascular Tissue System:
The vascular system consists of complex tissues, the phloem, and the xylem. The xylem and phloem together constitute vascular bundles. In dicotyledonous stems, cambium is present between phloem and xylem. Such vascular bundles because of the presence of cambium possess the ability to form secondary xylem and phloem tissues and hence are called open vascular bundles. In the monocotyledons, the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissues they are referred to as closed.
Read More: Plant Tissue