form 2, chap 04: interdependence among living organisms and the environment (6)

Chapter4.6

The Role of Humans in Maintaining the Balance of Nature

Pollution

Environmentalissues

Deforestation

The thinning of theozone layer

Greenhouseeffect

Acid rain

1

© Amazing Tunas Enterprise (001573407-U)TRG – Science Form 2

Chapter 4 : Interdependence Among Living Organisms and the Environment

Chapter4.6 The Role of Humans in Maintaining The Balance of Nature

The greenhouse effect occurs because a layer of carbon dioxide in theatmosphere trap a portion of heat in the air from escaping to the outer space

Greenhouse effect

The accumulation of heat in the air raises the Earth’s temperature. This is alsoknown as global warming

The major cause of the greenhouse effect is deforestation

Global warming will causes the melting of icebergs and ice glaciers, resulting inthe rising of sea levels

2




The ozone layer in the atmosphere protect the Earth from the ultraviolet rays ofthe Sun

The thinning of the ozone layer

The ozone layer will absorb the ultraviolet rays before they reach the Earth

Use of chlorofluorocarbons (CFCs) in the manufacture of refrigerators andair conditioners has resulted in the depletion of the ozone layer

As a result, the ozone layer become thinned

The ultraviolet rays that reach the Earth will harms human health by causing(a) skin cancer(b) cataracts

3




Deforestation is the result of the removal of trees without sufficient reforestation

Deforestation

Cutting sown trees in the forest for farming, housing and building factories,results in the loss of biodiversity and destruction of wildlife

4




When sulphur dioxide and nitrogen dioxide dissolve in rain water, acid rain will beformed

Acid rain

Sulphur dioxide and nitrogen dioxide are gasses released from vehicles andfactories

Acid rain can(a) destroy the habitats and make it unsuitable for organisms to live(b) destroy the aquatic life in lake(c) destroy the building

5




Waste materials from residential district and industrial residential which dumpedin the river and sea pollute the water

Pollution

Effects of water pollution(a) The chemicals that added into the lake can decreases the amount of

oxygen that the aquatic organisms need to live(b) The plastic that dumped in the sea can kills the dolphin

Water pollution

Air pollution Land pollution

6




Exhausts from all forms of transportation and fuel combustion in industrialdistrict and power plants pollute the air

Pollution

Effects of air pollution(a) Lung disease(b) Asthma(c) Emphysema(d) Acid rain

Water pollution

Air pollution

Land pollution

7




Dumping of waste, spillage of chemicals and acids rain pollute the land

Pollution

Effects of land pollution(a) Flash floods and landslides

Water pollution Air pollution

Land pollution

8



Steps to be taken to reduce the environmental pollution(a) Car pool(b) Bring your own shopping bag instead of using the shopping mal

plastic(c) Limit the use of chlorofluorocarbon (CFCs)(d) Avoid open-air burning(e) Do not litter(f) Educate the public on the important of recycle(g) Tighten laws regarding the spillage of chemicals from factories

Q.R.4.6 Quick Refresh

9



Smart Review

Prey-predator, symbiosis and competition are three different types of interaction between living organisms

Commensalism, parasitism and mutualism are three types of symbiotic relationship

A pyramid of numbers shows the number of organisms at each trophic level

Photosynthesis is a process of manufacturing food, carried out by green plants

Conserving and preserving living organisms are important to prevent extinction of plants and animals species

10



form 2, chap 04: interdependence among living organisms and the environment (6)

Documents

environment chapter

u chapter

amazing tunas enterprise

living organisms commensalism

aquatic organisms

number of organisms

role of humans

environmental pollution