biodiversity

Question 1

species

Answer 1

a group of organisms with similar morphological, physiological, biochemical
and behavioural features, which can breed together naturally to produce fertile offspring,
and are reproductively isolated from other species

Question 2

ecosystem

Answer 2

a relatively self-contained, interacting community of organisms, and the
environment in which they live and with which they interact

Question 3

niche

Answer 3

the role of an organism in an ecosystem

Question 4

Biodiversity

Answer 4

can be defined as the degree of variation of life forms in an ecosystem,
considered at three different levels:

Question 5

biodiversity at 3 different levels

Answer 5

-The variation in ecosystems or habitats
The number of different species in the –ecosystem and their relative abundance
The genetic variation within each species

Question 6

The number of different species in the ecosystem and their relative abundance

Answer 6

 Species diversity takes species richness (number of species in a community)
and a measure of the evenness of the abundance of the different species
 Ecosystems with high species diversity tend to be more stable than ones
with limited diversity (more able to resist change)

Question 7

The genetic variation within each species

Answer 7

 Genetic diversity is the diversity of alleles within the genes in the genome of
a single species
 Important in providing populations with the ability to adapt to changes in
biotic (caused by living organisms) and abiotic (physical characteristic of a
habitat) factors

Question 8

Sampling can be

Answer 8

random or systematic

Question 9

Random sampling using

Answer 9

frame quadrats:

Question 10

A quadrat is

Answer 10

a square frame that marks off an area of ground, or water

Question 11

Samples must use

Answer 11

random sampling technique to avoid any bias

Question 12

Results can be used to

Answer 12

calculate species frequency (measure of the chance of a
particular species being found in a particular quadrat) and species density (measure
of how many individuals per unit area)