Free Printable AQA A Level Biology Section 7.4 Ecology

1.

The number of individuals of one species is:

a)

a community

b)

a population

c)

a niche

d)

an ecosystem

2.

All the populations in a habitat is:

a)

an ecosystem

b)

a niche

c)

a community

d)

a succession

3.

The living factors which affect populations sizes are (a) factors

4.

The non-living/physical factors which affect a population size are (a) factors

5.

What is indicated by the yellow line on the graph?

(a)

6.

Which of the following are abiotic factors?

a)

temperature

b)

soil pH

c)

predation

d)

light intensity

7.

Which of the following are biotic factors?

a)

competition

b)

salinity

c)

predation

d)

carbon dioxide concentration

8.

Using a grid with coordinates to place quadrats is an example of:

a)

random sampling

b)

systematic sampling

9.

Using a transect to place quadrats is an example of:

a)

systematic sampling

b)

random sampling

10.

Which is the correct formula for estimating populations using the mark-release-recapture method?

a)

$\frac{number\ in\ 1st\ sample\ \ x\ \ number\ in\ 2nd\ sample}{number\ recaptured\ \left(marked\right)\ in\ 2nd\ sample}$

b)

$\frac{number\ recaptured\ \left(marked\right)\ \ x\ \ number\ in\ 2nd\ sample}{number\ in\ 1st\ sample}$

c)

$\frac{number\ recpatured\ \left(marked\right)\ \ x\ \ number\ in\ 1st\ sample}{number\ in\ 2nd\ sample}$

11.

What are the first species to colonise a bare area known as?

a)

sere

b)

climax community

c)

pioneer

12.

At which point are the pioneer species found?

a)

I

b)

II

c)

VI

d)

VII

13.

At which stage is the climax community?

a)

III

b)

V

c)

II

d)

VII

AQA A Level Biology Section 7.4 Ecology

Total questions: 13

Worksheet time: 5mins

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