Leaf structures

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Lesson Plan BIOLOGY

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Concept

Study of the Leaf structure & Phyllotaxy in plants.

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Purpose

Awareness about the structure of a typical leaf & the types of Phyllotaxy in plants for their mode of arrangement

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Category & Time

Medium

40-45 minutes

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Learning Outcomes

Student’s awareness about the –

* Typical leaf structure

* Essentiality of various leaf parts in a plant

* Familiarity about Phyllotaxy in plants

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Question session

Q. Give the definition of leaf.

Q. What do you call the structure by which leaf is attached at plant?

Q. Give the technical term for the mode of arrangement of leaves on plant.

Q. How many types of arrangement of leaves in plants are there/

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Definition of Leaf

Leaf is the flattened outgrowth of Stem or a branch that develops at node & has a bud in it’s axil. These are the dissimilar organs & are meant primarily for Photosynthesis, Respiration & Transpiration.

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Parts of the Leaf

1. Leaf Base2. Petiole3. Lamina

more

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Leaf Base

The part of leaf attached to the stem or branch is called- Leaf base. It protects a Bud in it’s axil.

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Petiole

The part of leaf that connects the lamina with stem, is called leaf petiole. Some time a leaf may not have a petiole, such leaves are called – Sessile otherwise the leaf is called Petiolate.

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Lamina

It is the flat, expended & broad part of leaf with framework of veins & veinlets. The lamina is the most important part of the leaf as it is the seat of food manufacturing in plant.