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Date May 2017 Marks available 3 Reference code 17M.2.HL.TZ2.4
Level Higher level Paper Paper 2 Time zone Time zone 2
Command term Outline Question number 4 Adapted from N/A

Question

The image shows a food web.

Using the food web, identify a detritivore.

[1]
a.i.

Using the food web, identify a saprotroph.

[1]
a.ii.

State the name of the domain to which birds, such as the Elf owl, belong.

[1]
b.

Outline the energy flow through this food web.

[3]
c.

Markscheme

earthworm/woodlouse

a.i.

bacteria/fungi

Do not accept protozoans or nematodes as they are consumers.

a.ii.

eukaryote/eukaryota/eukarya

 

b.

a. light energy of Sun is converted by plant/autotroph to chemical energy «in carbon compounds through photosynthesis» 

b. detritivores/saprotrophs decay plant material «that accumulates in the soil» to obtain energy  OWTTE

c. consumers release energy from the carbon compounds by cell respiration energy lost as heat 

d. energy is used by organisms for metabolism 

e. energy is transferred between organisms/trophic levels through the food chains/web  
For mp e, accept specific example such as energy is transferred from primary to secondary consumer etc.

f. energy is lost at each trophic level «so lengths of food chains/web are restricted»
OR
approximately 80/90 % of energy is lost «between trophic levels»
Vice versa

Award mark points that refer to the specific organisms from this food web.

 

c.

Examiners report

[N/A]
a.i.
[N/A]
a.ii.
[N/A]
b.
[N/A]
c.

Syllabus sections

Core » Topic 4: Ecology » 4.2 Energy flow
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