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Plant Tissues
• Highlight or underline• New cells formed in the meristems of a
plant are similar in appearance and function
• Some must remain meristematic
• Most mature and become other tissues
Plant Tissues
• Highlight or underline- Tissues may be classified
• I Meristems
• II Permanent
– A Dermal- surface
– B Ground
• Parenchyma
• Collenchyma
• Sclerenchyma
C Vascular
• Xylem
• Phloem
Plant Tissues
• Highlight or underline• A simple tissue is composed of only one
cell type.
• Complex tissues contain more than one cell
type
Meristematic Tissue
Highlight or underlineApical meristems are located at the tips of stems and roots.
The activity of these meristems results in an increase in
plant length.
This is primary growth
The resulting tissues are called primary tissues
Meristematic Tissue
Highlight or underlineLateral meristems are found near the periphery of stems and
roots and are responsible for increase in diameter.
This is know as secondary growth and secondary tissues
Questions 4a and b
Guard Cells
Others?
Bean shaped
Surface Tissues
Observe and answer questions 4 a and b.
Observe and answer Question 5a and b
Other epidermal cells
Questions 6 and 7
6. Protects against __?__
loss
7. The guard cells regulate
the size of stomata. As a
result they control gas
exchange and water loss
Question 8
Clue: how
many kinds of
cells are
present?
Figure 2.9 Lower Epidermis
Epidermal
Periderm or cork
Highlight or underline –
Periderm replaces the epidermis on plants with active lateral
meristems.
Cork cells fit tightly together and are dead at maturity.
Simple Fundamental Tissue
Collenchyma
Highlight or underlineCollenchyma is a simple tissue with
irregularly thickened cell walls
Collenchyma
Answer
Question 9
Parenchyma
Highlight or underline
Parenchyma is the most common kind
of simple tissue. It makes up the bulk
of the herbaceous (non woody) plant
body.
Parenchyma
Sclerenchyma
Highlight or underline-
Sclerenchyma cells have thick secondary
cell walls and are dead at maturity
In contrast to collenchyma has evenly
thickened walls
Question 11
Sclerenchyma
Very thick walls
Sclerenchyma
Sclerenchyma Fibers
Figure 2.11
Question 12
Sclerenchyma
Figure 2.12
Parenchyma
Collenchyma
Important Note:
Highlight or underlineParenchyma, collenchyma and sclerenchyma are basic cell
types that often form simple tissues. Frequent references will
be made of these three tissues. Know their characteristics and
main functions.