3.4.6 Biodiversity Within A Community

Question 1

What is biodiversity

Answer 1

Variety of living organisms

Question 2

What is a community

Answer 2

All populations that live in an area

Question 3

What is species richness

Answer 3

Measure of no of different species within a community

Question 4

What does index of diversity do

Answer 4

Describes relationship between
No of species in a community
No of individuals in each species

Question 5

Why is simpsons biodiversity index more useful that species richness

Answer 5

Take into account the no of individuals in each species within

May be present in high or low numbers (per species)

Question 6

Simpsons biodiversity index equation

Answer 6

N(N-1)
———-
Sum of n(n-1)

Where N is total number is of organisms for all species

Where n is total organisms of each species

Question 7

How can farming tech reduce biodiversity

Answer 7

Removal or woodland
Monoculture (1 type of crop)
Use of herbicides to kill weeds

All of those reduce Barry or plant species so less habitats and less variety of food sources

Question 8

How can biodiversity be increase in areas of agriculture

Answer 8

Introduction of hedgerows

Reduce use of pesticides

Using different crops in the same area (intercropping)