T5L2 Succesion

Question 1

Name the three types of succession

Answer 1

Primary
Secondary
Deflected

Question 2

Describe the differences between the three types of succession

Answer 2

PS occurs when pioneer species colonise bare rock
SS occurs when an existing climax community has been cleared by a disturbance and the land is once again colonised
Deflected succession is when anthropogenic factors such as agriculture pause succession forming a plagioclimax

Question 3

Give an example of deflected succession in the UK

Answer 3

If all farming in the UK ceased secondary succession would continue and the rest of the wild land in the UK would be re-established as coniferous forest

Question 4

Give an example of primary succession

Answer 4

Sand dunes

Question 5

In the past 200 years an iceberg melted from end A to end B to release bare rock. Explain why over the length of the rock from end A to B, the species present are different

Answer 5

M1/End A melted first so bare rock was colonised first
M2/By lichens and mosses
Which were then
M3/replaced by larger grasses and shrubs and then larger trees
M4/As you go from end B to A the species present become older and more permanent
M5/No species is found through the whole rock

Question 6

Give an example of secondary succession

Answer 6

Colonisation of volcanic rock

Question 7

Explain the term climax community

Answer 7

The last stage of succession where all organisms in the ecosystems balance with eachother in a STABLE community where there s ONE DOMINANT SPECIES

Question 8

What has to start off sucession

Answer 8

a disturbance

Question 9

Describe conditions of secondary succesion

Answer 9

Seeds left in soil
Soil may be fertile
Root systems may be pre existing