This document discusses the structure of simple and complex tissues. Simple tissues are composed of a single cell type with a common origin and function. There are three types of simple tissues: parenchyma, collenchyma, and sclerenchyma. Parenchyma cells have thin cell walls, are living with large central vacuoles, and have intercellular spaces. They provide support, store food, and facilitate gas exchange. Collenchyma cells are elongated and living with small intercellular spaces. Their cell walls contain cellulose and pectin. Collenchyma provides flexibility to plant parts without breaking.

1. Topic
STRUCTURE OF SIMPLE AND COMPLEX TISSUES
RELATION

2. Complex and Simple Tissues
SIMPLE TISSUES:
A simple tissue is made up of similar type of cells
which have common origin and function.
TYPES:
There are 3 types of tissues.
1.Parenchyma
2.Collenchyma
3.Sclerenchyma

3. 1.PARENCHYMA
It is composed of living
cells which are variable in
their morphology and
physiology.
OCCURANCE:
It occurs in pith,
mesophyll of leaf, endosperm
of seed , pulp of fruit.

4. STRUCTURE
 It consists of unspecialized
cells with thin cell wall.
 These are living with large
central vacuole.
 Have intercellular spaces
between them.
 They are oval , rounded,
polygonal in shapes.

5. FUNCTIONS
It provides support to plants and also
stores food in the form of starch grains ,
fats and oils.
Air spaces in parenchyma also facilitates
exchange of gases.

6. 2. COLLENCHYMA
 They are elongated living cells with small
intercellular spaces. Their cell walls are made of
cellulose and pectin.
 It occurs in peripheral regions of stems and
leaves.
 It allows easy bending in various parts of a plant,
without breaking.
 Mature collenchyma are living and contain
protoplast.

7. TYPES:
There are three types of
collenchyma tissues on the
basis of cell enlargement .
1.Angular
2.Lamellar
3.Tubular