human impact

Question 1

what is biodiversity

Answer 1

• the number of species and number of individuals in each species in a specified region.

Question 2

what are endangered species

Answer 2

• any species at risk of extinction

Question 3

what is extinction

Answer 3

• no longer in existence

Question 4

why does natural selection lead to species becoming endangered and name some species that are extinct because of this

Answer 4

• species do not have the ability to survive the changing environment.
• sabretooth tiger
• wooly mammoth
• cave bear

Question 5

why does deforestation leas to animals becoming extinct and name some of the animals

Answer 5

• natural habitats are destroyed, this can also contribute to climate change.
• golden toad

Question 6

why is habitat destruction leading to extinction and name some animals that are extinct because of this.

Answer 6

• organisms can no longer live there, meaning they die or move which decreases biodiversity.

Question 7

why are loss of hedgerows contributing to extinction and name some animals that are extinct because of this.

Answer 7

• will disrupt the natural ecosystems, and can reduce the availability of certain food sources
• dormice
• house sparrows

Question 8

how is pollution contributing to extinction and name some animals that are extinct

Answer 8

• can lead to habitat destruction and alter the ecosystem function
• golden toad.

Question 9

how does hunting and collecting contribute to extinction and name some animals that are extinct

Answer 9

• leads to the decline of animal species
• Tasmanian tiger
• wooly mammoth

Question 10

how does competition from domestic animals lead to extinction and name some animals that are extinct

Answer 10

• one species could get an advantage and kill the other animals.
• many species of ancient dogs.

Question 11

define conservation

Answer 11

• preservation, protection or restoration of the natural environment and of wildlife.

Question 12

how do nature reserves improve biodiversity

Answer 12

• the natural habitats can be safeguarded and can start to repopulate under supervision.

Question 13

how do restrictions to trade improve biodiversity

Answer 13

• can prevent the introduction of invasive species and can regulate import of things that can e invasive to the environment

Question 14

how does zoo breeding increase biodiversity

Answer 14

• they increase population numbers and preserve genetic diversity

Question 15

how do sperm/seed banks increase biodiversity

Answer 15

• preserve genetic variation, can reintroduce certain features to the population

Question 16

how does reintroductions increase biodiversity

Answer 16

• restores ecosystems to their natural states and restores natural processes

Question 17

why is conservation of species important

Answer 17

• sustains life on earth
• provides essential ecosystems
• can lead to climate regulation

Question 18

list the reasons for deforestation

Answer 18

• agriculture
• logging
• infrastructure
• livestock
• grazing
• population growth
• intensive crop cultivation

Question 19

what is copping

Answer 19

• cutting trees at the base to encourage new shoots to grow and create diverse woodland structures

Question 20

what is selective cutting

Answer 20

• removal of specific trees, leaving others intact which allows the forest to regenerate naturally

Question 21

what is long rotation time

Answer 21

• delaying logging, growing a forest past a short life

Question 22

what steps can be taken to improve the efficiency of forestry

Answer 22

• investing in good quality crops
• make good choices when it comes to management
• encourage the local government
• create nature reserve parks

Question 23

why are diseases common on fish farms

Answer 23

• they have poor water quality
• overcrowding
• inadequate diets
• can be hard to treat because pathogens can become resistant

Question 24

negative impacts of fish farming

Answer 24

• pollution of water
• contamination of the area
• transfer of disease and pathogens
• nutrient build up creating alegar blooms

Question 25

positive impacts of fish farming

Answer 25

- food security - environmental sustainability - economic growth - job creation - ecosystem restoration - biodiversity preservation