Botany lecture notes

Nodal Anatomy of Angiosperms: Unilacunar, Trilacunar and Multilacunar Node with Examples


Classification of Nodes in Plants

Nodal Anatomy of Plants with Diagram
(Leaf Gap, Leaf Trace: Unilacunar, Trilacunar and Multilacunar Nodes in Angiosperms)

Anatomy of Nodal and Inter-nodal Region are Different:

The stem of plants is differentiated into nodes and internodes. The anatomical features of the nodal region are quite different from that of the inter-nodal region. This anatomical difference is due to the presence of Vascular Supply to the leaves and branches from the main vascular cylinder of the stem.

Nodal Region of Higher Plants Posses Leaf Gaps and Leaf Traces

Each leaf that originates from the node, of higher plants possesses vascular tissue and these vascular tissues of the leaves are connected to that of the stem. A vascular strand that extends between the vascular cylinder of stem and the base of the leaf is called Leaf Trace or Foliar Trace. Even if the leaf trace possesses both xylem and phloem, the relative amount of xylem will be more in the leaf trace than phloem. Moreover, the proximal portion, (portion near the vascular cylinder of the stem) contains only the xylem. Whereas, the distal end of the leaf trace (near to the leaf base) contains both xylem and phloem. Leaf trace helps to transport water and minerals from the xylem to the leaf lamina for photosynthesis. The circulation of photosynthetic products from the leaf lamina to the phloem of the stem is also facilitated by the phloem strands in the leaf traces.

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Botany lecture notes

Structure and Composition of Xylem PPT


Plant Science PPT

Vascular Tissue System 1: Xylem PPT
(Structure, Composition & Classification of Primary and Secondary Phloem PPT)

What is vascular tissue system? What is xylem? What are the components / elements of xylem? Tracheids, Vessels, Xylem Fibres and Xylem Parenchyma, Classification of xylem, Primary xylem, Protoxylem, Metaxylem, Secondary xylem, What are Tyloses?

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Botany lecture notes

Vascular Bundles PPT (Structure and Classification)


Plant Science PPT

Vascular Bundles PPT
(Structure and Classification of Vascular Bundles PPT)

What are vascular bundles (VB)? How vascular bundles originate? Different types of vascular bundles in plants: Conjoint Vascular Bundles, Collateral Vascular Bundles, Bi-collateral Vascular Bundles, Open and Closed Vascular Bundles, Radial Vascular Tissue, Concentric Vascular Bundles, Amphicribral Vascular Bundle and Amphivasal Vascular Bundles. Functions of Vascular Bundles

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Botany lecture notes

Simple Permanent Tissue 3: Sclerenchyma PPT


Plant Science PPT

Sclerenchyma PPT
(Structure, Classification and Functions of Sclerenchyma Cells PPT)

What are sclerenchymatous cells? How sclerenchymatous tissue is classified in plants? What are sclereids and fibres? Brachysclereids, Macrosclereids and Osteosclereids, Asterosclereids and trichosclereids, What are xylary and extraxylary fibres? What are libriform fibres? What are gelatinous fibres? What are phloeic or phloem fibres? What are perivascular fibres? What are hard and soft fibres? What are the functions of sclerenchyma?

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Botany lecture notes

Structure and Composition of Phloem PPT


Plant Science PPT

Vascular Tissue System 2: Phloem PPT
(Structure, Composition & Classification of Primary and Secondary Phloem PPT)

What is Phloem? What are the components of Phloem? Sieve elements, Companion Cells, Phloem Fibres, Phloem Parenchyma, How Phloem is Classified? Primary and Secondary Phloem, Protophloem and Metaphloem

Learn more: Lecture Note in Phloem

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