The leaf is the broad, flat, green part of the shoot that grows laterally from nodes. It has several key structures - a petiole or leaf stalk that attaches to the stem, a lamina or flat blade, and veins that provide structure and transport water and nutrients. Leaves come in different shapes, margins, arrangements, and venation patterns. They are either simple, with one undivided lamina, or compound, divided into smaller leaflets. Students are assigned to complete a form with questions and draw and label the structure of a leaf.

1. The leaf

2. Introduction
Leaf is also flat, green and
broad part of the shoot grows
laterally from the node.
A node is a point on the stem
from where leaves and branches
originate.
Leaves do not continuously grow
like the stem. It stops growing
on attaining full size

3. Structure of
a leaf

4. Petiole  The basal part of a leaf is a stalk
called petiole.
 It is attached to the stem at the
node.
 An axillary bud is present in the
axil of the leaf.
 The axil is the angel between the
leaf and the stem.
 Some leaves are directly attached
to the stem without a leaf stalk
and are called sessile leaves

5. Lamina/Leaf
blade
The green, flat,
and broad part
of the leaf.
Its outer edge is
called leaf
margin.

6. Midrib
Petiole continues into the lamina as
midrib.
This laterally gives out fine branches
called veins.
Petiole, midrib, veins and veinlets
conduct water and food.
Veins also provide a skeleton or a
supportive framework to the leaves.

7. Types of leaves
Simple leaf Compound leaf
In this, the leaf lamina is
undivided and is a single
piece.
In this, the lamina is
divided into smaller units
called leaflets.
Examples: Mango, banyan,
and banana
Example : rose

8. Leaves can
be classified
based on
the
following
Shape – Example: Circular, Oval and
oblong shaped leaf
Margin – Example : Toothed /Wavy /
Spinous margin
Arrangement – Alternate / opposite /
whorled
Venation – Recticulate / Parallel

9. Homework
COMPLETE THE
GOOGLE FORM WHICH
IS SENT.
DRAW AND PRACTICE
THE STRUCTURE OF A
LEAF WITH ITS PARTS