Biodiversity within a community

Question 1

Biodiversity can relate to a range of what

Answer 1

Biodiversity can relate to a range of habitats, from a small local habitats to the earth

Question 2

species richness def

Answer 2

a measure of the different number of species in a community

Question 3

How to calculate index of diversity?

Answer 3

N(N-1)
d=———————
Σn(n-1)

n = total no. of organisms for a single species in the community
N = total no. of organisms in the community
Σ = sum of

Question 4

What are the units for index of diversity ?

Answer 4

N = total number of organisms of all species
n = total number of organisms of each species

Question 5

What can reduce biodiversity + examples

Answer 5

Farming
- removal of hedge rows for larger fields
- lack of intercropping
- pesticides and inorganic fertilisers
- draining ponds
- monocultures

Question 6

What is an example of something a farmer can do to have a balance between farming and biodiversity

Answer 6

-keep verges in fields
- crop rotation to increase fertility
- natural meadows
- maintain ponds
- use organic fertilisers
- don’t cut edges of field until seed dispersal

Question 7

Investigating diversity - a/a sequence

Answer 7

more similar seq of proteins = more closely related

Question 8

Investigating diversity - observable characteristics

Answer 8

Fast but unreliable
- can be influenced by the environment
- observations are coded by more than 1 gene so may be hard to determine evolution

Question 9

Investigating diversity - base sequence of DNA

Answer 9

DNA is processed then analysed to get the base sequence
more similar = more closely related

Question 10

Investigating diversity - mRNA base sequence

Answer 10

More similar = more closely related