LEAF PRESENTATION

start

GROUP 6

Leaf

microscopic structures

parts

modifications

Types

functions

definition

Contents

• Green, thin flattened lateral structure borne on the stem
• Develop at the node and bears buds
• Exogenous in origin
• Has limited growth
• Primary photosynthetic organs and the main site of transpiration

What is a Leaf?

LEAF

Functions of Leaf

• Photosynthesis
• Transpiration
• Gaseous exchange
• Protection of buds
• Conduction of water and dissolved solutes

Parts of a Leaf

LEAF BLADE OR LAMINA

• Expanded flat green portion of the leaf
• The seat of photosynthesis, gaseous exchange, transpiration and most of the metabolic reactions
• Traversed by the midrib from which arise numerous lateral veins and thin veinlets

Parts of a Leaf

LEAF BASE

• Attached to the node of the stem

• Protects growing buds at it’s axil

• In legume leaf, base become swollen which is known as pulvinus.

Parts of a Leaf

PETIOLE/LEAF STALK

• The bridge between lamina and stem
• Cylindrical or sub cylindrical or flattened structure of leaf which joins the lamina with stem.

Parts of a Leaf

LET'S HAVE A CLOSER LOOK..

MICROSCOPIC STRUCTURE

upper and lower epidermis

It is composed of a thin layer of small cells called epidermal cells, which form a protective layer of the cells, and guard cells that expand and contract

Microscopic Structure

stomata

the opening between two guard cells which are the venue for CO2 and O2.

Microscopic Structure

cuti(loreine)cle

a waxy substance on the top layer which protects the epidermis

Microscopic Structure

Mesophyll cells(Spongy and Palisade)

a layer of loosely arranged large cells of various shapes which contain numerous pigmented organelles call chloroplasts which are the sites of photosynthesis.

Microscopic Structure

vascular bundles

The conducting tubes for food, growth regulators, water, and nutrient elements in a network of leaf veins.

Microscopic Structure

Tubes that carry food growth regulators.

PHLOem vessels

xylem vessels

Vessels that carry water and mineral nutrients.

Microscopic Structure

One in which the main rachis bears more than one lamina surface called leaflets. There is one axillary bud in the axil of the whole compound leaf.

When the petiole bears a single lamina.

SIMPLE LEAF

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COMPOUND LEAF

TWO TYPES OF LEAF

TWO TYPES OF LEAF

TWO TYPES OF LEAF

MODIFICATION OF LEAF

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LEAF TENDRILS

A slender wiry coiled structure which helps in climbing the support.

Modification of Leaf

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LEAF HOOKS

These hooks cling to the bark of the tree and acts as an organs of support for climbing. .

Modification of Leaf

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Leaf spikes and Prickles

Leaves of certain plants develop spine sent structure. Either on the surface or on the margins as an adaption to herbivory and xeric conditions

Modification of Leaf

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STORAGE LEAVES

These succulent leaves store water mucilage or food material.

Modification of Leaf

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Leaf spikes and Prickles

Leaves of certain plants develop spine sent structure. Either on the surface or on the margins as an adaption to herbivory and xeric conditions

Modification of Leaf

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PHYLLODE

Flat, green coloured leaf-like modifications of petioles or rachis.

Modification of Leaf

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PITCHER

Apical part of the leaf as modified into a pitcher, the mouth of the pitcher is closed by a lid which is the modification of leaf apex.

Modification of Leaf

MEMBERS

ANCHETA, JADABALANAY, LOREINE YAMINAH GARVIDA, VICTOR LUMABAO, HENIE JANE LLANA, BRENN JAN MACADAEG, KHAIZEE NIÑO, CHRISTINE JOY RUIZ, JAMES PHILIP VALDEZ, HEYZEL

L eaf Team

ANY QUESTIONS?

Thanks!

1-5 IDENTIFICATION

1. IT IS A GREEN, THIN FLATTERED LATERAL STRUCTURE BORNE IN THE STEM.2. THE LEAF PRODUCES FOOD FOR THE PLANT THROUGH WHAT PROCESS? 3. IT IS THE SEAT OF PHOTOSYNTHESIS. 4-5. WHAT ARE THE TWO TYPES OF LEAF?

QUIZ

6-10 ENUMERATION

ENUMERATE 5 LEAF PARTS.

QUIZ

14.

15.

13.

12.

11.

11-15 SINGLE OR COMPOUND

QUIZ

1-5 IDENTIFICATION

1. IT IS A GREEN, THIN FLATTERED LATERAL STRUCTURE BORNE IN THE STEM. ( LEAF )2. THE LEAF PRODUCES FOOD FOR THE PLANT THROUGH WHAT PROCESS? ( PHOTOSYNTHESIS ) 3. IT IS THE SEAT OF PHOTOSYNTHESIS. ( LEAF BLADE/LAMINA ) 4-5. WHAT ARE THE TWO TYPES OF LEAF? ( SIMPLE AND COMPOUND )

QUIZ

MARGINS

VEINS

MIDRIB

STIPULE

APEX

PETIOLE

STEM

BASE

AXILLIARY BUD

6-10 ENUMERATION

ENUMERATE 5 LEAF PARTS.

QUIZ

13.COMPOUND

12.COMPOUND

14.COMPOUND

11. SIMPLE

15.SIMPLE

11-15 SIMPLE OR COMPOUND

QUIZ