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Question 18M.2.SL.TZ2.c

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Date May 2018 Marks available [Maximum mark: 3] Reference code 18M.2.SL.TZ2.c
Level SL Paper 2 Time zone TZ2
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 3]
18M.2.SL.TZ2.c

Explain how energy and nutrients are transferred in ecosystems.

[3]

Markscheme

a. energy enters ecosystems from the Sun / continuous supply from the Sun 

b. light energy is converted into chemical energy and lost with movement along food chains
OR
energy needs to be «constantly» added «to ecosystem» as lost with movement along food chains / energy lost as heat with movement along food chains 

c. nutrients are recycled within ecosystems / nutrients in an ecosystem are finite and limited 

d. nutrients not lost but transformed into different compounds 

e. nutrients «carbon compounds»/energy flow through food chains by means of feeding

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