A biology lesson on A biology lesson on deforestationdeforestation

Objectives of the lessonObjectives of the lesson

Content objective:Content objective:Students should be able to define deforestation, Students should be able to define deforestation,

identify its causes, and identify its causes, and describe and explain describe and explain its effects.its effects.

Language objective:Language objective:To write paragraphs explaining the effects of To write paragraphs explaining the effects of

deforestation. (Use the language form of deforestation. (Use the language form of causal explanation.causal explanation.))

Teaching sequenceTeaching sequence

Activity1Activity1: Distinguish : Distinguish DefinitionDefinition, , CausesCauses and and Consequences.Consequences.

Activity2Activity2:: Work out the Work out the causal relationship causal relationship in the first in the first consequence: consequence: Destruction of natural habitats in the forestDestruction of natural habitats in the forest ..

Activity3Activity3:: Work out the Work out the causal relationshipcausal relationship in the second in the second consequence: consequence: increase in carbon dioxide concentration in the atm.increase in carbon dioxide concentration in the atm.

Activity4Activity4:: Work out the Work out the causal relationshipcausal relationship in the third in the third consequence: consequence: Soil erosion.Soil erosion.

Activity 1Activity 1

Distinguish Definition, Distinguish Definition,

Causes and Causes and

Consequences.Consequences.

Getting Getting wood to wood to

make make paperpaper

Soil Soil erosionerosion

Removing Removing too many too many

trees trees from from

forestforest

Destruction Destruction of natural of natural habitatshabitats

Building Building leisure leisure resortsresorts

Getting Getting wood to wood to

make make furniturefurniture

Building Building houses houses

and roadsand roads

Increase in Increase in carbon carbon

dioxide in dioxide in atmosphereatmosphere

Getting Getting wood to wood to

make make paperpaper

[cause][cause]

Soil Soil erosionerosion

[consequence[consequence]]

Removing Removing too many too many

trees trees from from

forestforest

[definition][definition]

Destruction Destruction of natural of natural habitatshabitats

[consequence][consequence]

Building Building leisure releisure re

sortssorts

[cause][cause]

Getting woGetting wood to make od to make furniturefurniture

[cause][cause]

Building hoBuilding houses and rouses and ro

adsads

[cause][cause]

Increase in Increase in carbon carbon

dioxide in dioxide in atmosphereatmosphere

[consequence][consequence]

Activity 2Activity 2

Work out the Work out the causal relationshipcausal relationship in the first consequence: in the first consequence:

Destruction of natural habitats in the Destruction of natural habitats in the forest.forest.

CuttingCutting down of down of treestrees

LossLoss of of home home

for for wildlifewildlife

[Possible][Possible]

extinctionextinction of wildlife of wildlife species in species in

forestforest

DestructionDestruction of natural of natural habitatshabitats

Activity 3Activity 3

Work out the Work out the causal relationshipcausal relationship in the second consequence: in the second consequence:

Increase in carbon dioxide Increase in carbon dioxide concentration in the atmosphereconcentration in the atmosphere

Less COLess CO22 is is

absorbedabsorbed

Cutting Cutting down down treestrees

Fewer Fewer plants plants

undergo undergo photo-photo-

synthesissynthesis

Concentration Concentration of COof CO22 in in

atmosphere atmosphere risesrises

Activity 4Activity 4

Work out the Work out the causal causal relationshiprelationship in the third in the third

consequence: consequence:

Soil erosionSoil erosion

Cutting Cutting down of down of

treestreesfloodingflooding Soil Soil

erosionerosion

Top soil is waTop soil is washed away to shed away to rivers by rainrivers by rain

Removal Removal of of

protectionprotection

soil is soil is blown blown

away by away by windwind

Land Land may may

become become a a

desertdesert

Loss of Loss of agriculturalagricultural

landland