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Leaf structures
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Lesson Plan BIOLOGY

Lesson Plan BIOLOGY

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Concept

Concept

Study of the Leaf structure & Phyllotaxy in plants.

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Purpose

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

Category & Time

Medium

40-45 minutes

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Learning Outcomes

Learning Outcomes

Students awareness about the

* Typical leaf structure

* Essentiality of various leaf parts in a plant

* Familiarity about Phyllotaxy in plants

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Learning Outcomes

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Learning Outcomes

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Learning Outcomes

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Question session

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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Learning Outcomes

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Definition of Leaf

Definition of Leaf

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

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Parts of the Leaf

Parts of the Leaf

1. Leaf Base2. Petiole3. Lamina

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Leaf Base

Leaf Base

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

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Petiole

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

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.

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