10.1.3 - Abiotic factors

Question 1

What are abiotic factors?

Answer 1

These are non-living factors that control different ecological niches.

Question 2

What two ways of sampling can be used to get an estimate for the population in a larger area?

Answer 2

Random sampling
Systemic sampling

Question 3

When is random sampling used?

Answer 3

Used when the area under study is very large and uniform.

A number of samples are taken from different positions within the habitat

Question 4

How do you know where to sample when using random sampling?

Answer 4

Place a numbered grid over area and use a random number generator.

Random walk - compass bearing and number of steps are both randomised.

Question 5

When is systemic sampling used?

and what does it involve?

Answer 5

Used when there is a change in species from one area of a habitat to another.

Lay a line (a transect) across an area and record species at regular intervals.

Question 6

How long should the transect be when using systemic sampling?

Answer 6

When there is no further change, stop

Question 7

What adaptation may plants living in low light intensity areas have?

Answer 7

More chlorophyll to absorb more light.