No. | Tissue system | Tissues present |
---|---|---|
1. | Epidermal tissue system | Epidermis, trichomes, hairs, stomata |
2. | Ground tissue system | Parenchyma, collenchyma, sclerenchyma, mesophyll |
3. | Vascular tissue system | Xylem, phloem, cambium |
List - I | List – II | ||
A. | Squamous Epithelium | i. | Goblet cells of alimentary canal |
B. | Ciliated Epithelium | ii. | Inner lining of pancreatic ducts |
C. | Glandular Epithelium | iii. | Walls of blood vessels |
D. | Compound Epithelium | iv. | Inner surface of Fallopian tubes |
Figures 9.20(a) and (b) refer to the steady flow of a (non-viscous) liquid. Which of the two figures is incorrect ? Why ?
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.
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.
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.
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