Leaf structure

1.

LEAF STRUCTURE

2.

Lesson objectives
To describe internal structure of leaf and
relationship between its function.

3.

Why all plants have leaves? What
happens if we remove them?

4.

Plant nutrition types
1) getting minerals and water from soil
2) phosynthesis:
6CO2+6H2O=C6H12O6+6O2

5.

Leaf function
Site of photosynthesis (making food)
Site of gas exchange (respiration)
Site of transpiration (water vaporization
through leaves)

6.

Leaf structure
1.
2.
3.
Epidermis
Mesophyll
Vascular tissue

7.

Upper
epidermis
Vascular
tissue

8.

1. Epidermis:
Covers leaves on both sites (upper and
lower epidermis)
Colorless
Transparent
Protects
Has stomata for gas exchange and
transpiration
Wax layer on upper epidermis

9.

10.

11.

2. Mesophyll
Types: palisade and spongy
Contains chlorophyll which gives green
color
Photosynthesis

12.

3.Veins (vascular tissue)
Types: xylem and phloem
Transports materials

13.

Let’s do the activity on p. 57

14.

Homework
Read p.56-57
Literacy on p. 57
New words