DP Biology (first assessment 2025)

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Question 19M.2.SL.TZ2.8a

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Date May 2019 Marks available [Maximum mark: 4] Reference code 19M.2.SL.TZ2.8a
Level SL Paper 2 Time zone TZ2
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 4]
19M.2.SL.TZ2.8a
(a)

Outline energy flow through a food chain.

[4]

Markscheme

a. energy from the sun/light energy is converted to chemical energy by photosynthesis ✔

b. «chemical» energy flows through the food chains by feeding ✔

c. energy is released «from carbon compounds» by respiration
OR
energy from respiration is used by living organisms and converted to heat ✔

d. heat is not recyclable / heat is lost from food chains
OR
heat cannot be converted to other forms of energy ✔

e. energy is lost in excretion/uneaten material/egestion/feces ✔

f. energy losses between trophic levels limits the length of food chains
OR
energy transfer is only 10 % between trophic levels ✔

Examiners report

Was well answered with most students being knowledgeable about ecology.