TOPIC 4 - BIODIVERSITY AND NATURAL RESOURCES
,
,4.1 KNOW THAT OVER TIME THE VARIETY OF LIFE HAS BECOME EXTENSIVE BUT IS NOW BEING
THREATENED BY HUMAN ACTIVITY
, HOW CAN VARIETY OF LIFE BE THREATENED BY HUMAN ACTIVITY?
THREAT EXAMPLE
Habitat loss Deforestation
Farming
Housing
Roads
Water pollution Sewage
Oil
Pesticides
Air pollution Acid rain
Carbon dioxide
Over exploitation Overfishing
Over farming
Hunting
4.2 i) UNDERSTAND THE TERMS BIODIVERSITY AND ENDEMISM
BIODIVERSITY WITHIN A SPECIES
KEY TERM DEFINITION EXAMPLE
Biodiversity Variety of life on earth.
It is the variety within and between all species of
plants, animals, fungi and microorganisms
Endemism Described the situation where a species is found Ring-tailed lemurs are only found
ONLY in one particular area in madagascar
THEREFORE…
Ring-tailed lemurs are ENDEMIC
to madagascar
Individuals within a species DIFFER from one another
- They show VARIATION (genetic variation)
Explain why GENETIC DIVERSITY is important in a species
- Allows a population to ADAPT
- To changing conditions
- Therefore maintaining the population
List the sources of genetic variation (link to topic 3)
- Mutations
,
,4.1 KNOW THAT OVER TIME THE VARIETY OF LIFE HAS BECOME EXTENSIVE BUT IS NOW BEING
THREATENED BY HUMAN ACTIVITY
, HOW CAN VARIETY OF LIFE BE THREATENED BY HUMAN ACTIVITY?
THREAT EXAMPLE
Habitat loss Deforestation
Farming
Housing
Roads
Water pollution Sewage
Oil
Pesticides
Air pollution Acid rain
Carbon dioxide
Over exploitation Overfishing
Over farming
Hunting
4.2 i) UNDERSTAND THE TERMS BIODIVERSITY AND ENDEMISM
BIODIVERSITY WITHIN A SPECIES
KEY TERM DEFINITION EXAMPLE
Biodiversity Variety of life on earth.
It is the variety within and between all species of
plants, animals, fungi and microorganisms
Endemism Described the situation where a species is found Ring-tailed lemurs are only found
ONLY in one particular area in madagascar
THEREFORE…
Ring-tailed lemurs are ENDEMIC
to madagascar
Individuals within a species DIFFER from one another
- They show VARIATION (genetic variation)
Explain why GENETIC DIVERSITY is important in a species
- Allows a population to ADAPT
- To changing conditions
- Therefore maintaining the population
List the sources of genetic variation (link to topic 3)
- Mutations
