💜 3.4.6 Biodiversity Within A Community

Question 1

What does biodiversity relate to?

Answer 1

A range of habitats, from a small local habitat to the Earth

Question 2

Define species richness

Answer 2

This is a measure of the number of different species in a community

Question 3

What is an index of diversity?

Answer 3

An index of diversity describes the relationship between the number of species in a community and the number of individuals in each species.

Question 4

What is the calculation of an index of diversity?

Answer 4

N (N - 1) / n (n - 1)

Question 5

What does N stand for in an index of diversity equation?

Answer 5

The total number of organisms in all species

Question 6

What does n stand for in an index of diversity equation?

Answer 6

The total number of organisms of each species

Question 7

What is the purpose of calculating the index of diversity?

Answer 7

• it can be used to compare areas of biodiversity
• The higher the number, the more biodiverse area is

Question 8

What impact does farming techniques have on biodiversity?

Answer 8

Farming techniques reduced by biodiversity.

Question 9

Give examples of how biodiversity is reduced by farming

Answer 9

• destruction of habitats
• Destruction of hedges
• monocultures have fewer associated species living on them
• they also have few variation in their alleles
• run off (leeching) of fertilisers leads to eutrophication
• pesticides kill insects
• palm oil extractions cause animals like orangutans to be displaced