DP Biology (first assessment 2025)

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Question 19N.2.SL.TZ0.c

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Date November 2019 Marks available [Maximum mark: 7] Reference code 19N.2.SL.TZ0.c
Level SL Paper 2 Time zone TZ0
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 7]
19N.2.SL.TZ0.c

Explain the movement of energy and inorganic nutrients in an ecosystem.

[7]

Markscheme

a. autotrophs/producers/plants obtain inorganic nutrients from the «abiotic» environment ✔

b. energy provided «mainly» by sunlight ✔

c. light energy converted «to chemical energy» through photosynthesis ✔

d. photosynthesis/producers/autotrophs convert inorganic carbon/carbon dioxide and water into carbon/organic compounds ✔

e. «these» carbon compounds/foods contain/are a source of «useable» energy «for life» ✔

f. carbon compounds/energy are transferred along food chains when eaten by consumers/heterotrophs ✔ Allow OWTTE for mpf for passed up trophic levels.

g. respiration returns carbon «dioxide» to the environment ✔

h. respiration releases stored/chemical energy as ATP/heat ✔

i. energy/ATP is used to carry out life functions/synthesis/growth/movement ✔

j. energy is lost/not recycled ✔

k. nutrients are recycled / example of recycled nutrient e.g. carbon ✔

l. decomposers recycle minerals/inorganic nutrients ✔

Syllabus sections