Biodiversity

Question 1

Explain why destroying heathland to grow wheat would decrease animal biodiversity.

Answer 1

Reduction in the number of plant species
:Less VARIETY of food sources
Greater competition for resources
Fewer habitats

Question 2

What information is needed to calculate index of diversity for a community?

Answer 2

Total number of species present

Total number of each species

Question 3

What is species richness?

Answer 3

The number of different species in a particular area at a given time

Question 4

What is biodiversity?

Answer 4

The variety of living organisms in an area

Question 5

Which is a better indicator of biodiversity - index of diversity or species richness?

Answer 5

Index of diversity

Question 6

Give 3 ways in which human activity can reduce biodiversity

Answer 6

Removing trees
Remove hedgerows
Use pesticides
Use herbicides
Monoculture

Question 7

What is a species?

Answer 7

A group of similar organisms that can reproduce and produce fertile offspring

Question 8

How is the index of diversity calculated?

Answer 8

d = N (N-1)
     --------------
     Sum of (n)

Question 9

Name the metal frame used when sampling an ecosystem

Answer 9

Quadrate

Question 10

How can a random sample be achieved?

Answer 10

Place tape measures perpendicular to each other (to make the axes of a graph)
Use a random number generator to produce coordinates
Use the coordinates to place the quadrat down

Question 11

What is sampling?

Answer 11

Selecting a group of individuals to measure that will represent the whole target population