A biology lesson on
deforestation
Objectives of the lesson
Content objective:
Students should be able to define deforestation,
identify its causes, and describe and explain
its effects.
Language objective:
To write paragraphs explaining the effects of
deforestation. (Use the language form of
causal explanation.)
Teaching sequence
Activity1: Distinguish Definition, Causes and Consequences.
Activity2: Work out the causal relationship in the first
consequence:
Destruction of natural habitats in the forest.
Activity3: Work out the causal relationship in the second
consequence:
increase in carbon dioxide concentration in the atm.
Activity4: Work out the causal relationship in the third
consequence:
Soil erosion.
Activity 1
Distinguish Definition,
Causes and
Consequences.
Getting
wood to
make
paper
Building
leisure
resorts
Soil
erosion
Removing
too many Destruction
trees
of natural
from
habitats
forest
Getting
Increase in
Building
wood to
carbon
houses
make
dioxide in
and roads
furniture
atmosphere
Getting
wood to
make
paper
Soil
erosion
[consequence]
[cause]
Removing
too many Destruction
trees
of natural
from
habitats
forest
[consequence]
[definition]
Getting
Building
Building Increase in
wood to
carbon
leisure
houses
make
resorts
and roads dioxide in
furniture
atmosphere
[cause]
[cause]
[cause]
[consequence]
Activity 2
Work out the causal relationship
in the first consequence:
Destruction of natural habitats in the
forest.
Cutting
down of
trees
Loss of
home
for
wildlife
[Possible]
extinction
of wildlife
species in
forest
Destruction
of natural
habitats
Activity 3
Work out the causal relationship
in the second consequence:
Increase in carbon dioxide
concentration in the atmosphere
Fewer
plants
Concentration
Less CO2 Cutting undergo
of CO2 in
is
down
photoatmosphere
absorbed trees synthesis
rises
Activity 4
Work out the causal
relationship in the third
consequence:
Soil erosion
Cutting
down of
trees
flooding
Soil
erosion
Top soil is
washed
away to
rivers by
rain
soil is
Land
Loss of
Removal
blown
may
agricultural
of
away by become
protection
land
wind
a desert