Ecosystems and Biodiversity

Question 1

Define these 4 words:
1) Habitat
2) Population
3) Community
4) Ecosystem

Answer 1

1) Place where a organism lives
2) All organisms of one species in a habitat
3) All different species in a habitat
4) All organisms living in a particular area and non-living abiotic conditions

Question 2

Define Biodiversity

Answer 2

The variety of different species of organisms on Earth or within an ecosystem

Question 3

Why is high biodiversity important?

Answer 3

It makes sure that ecosystems are stable because different species depend on each other for thing like food and shelter. Different species also help to maintain the physical environment for each other.

Question 4

What human action reduce biodiversity?

Answer 4

1) Deforestation
2) Pollution
3) Global warming

Question 5

Name the Abiotic factors which affect communites

Answer 5

1) Environmental changes
2) Toxic chemicals - Chemical pesticides or fertilisers. Excess fertilisers released into lakes and ponds cause eutrophication which leads to death of organisms (fish).

Question 6

Name Biotic factors which affect communites

Answer 6

1) Availability of food - In a bumper uear for berries, population of blackbirds might increase because there’s enough food for them all, therefore they’re more likely to survive + reproduce.

2) Number of predators - If number of lions decrease, number of gazelles might increase since fewer lions to eat them.

3) Competition - Organisms compete with other species for the same resources. Animals compete for things like spcae, shelter, food, water and mates. Plants compete for things likle light, space, water and minerals from the soil.