DP Biology (first assessment 2025)

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Question 20N.2.SL.TZ0.4c

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Date November 2020 Marks available [Maximum mark: 3] Reference code 20N.2.SL.TZ0.4c
Level SL Paper 2 Time zone TZ0
Command term Describe Question number c Adapted from N/A
c.
[Maximum mark: 3]
20N.2.SL.TZ0.4c
(c)

Describe how autotrophs absorb light energy

[3]

Markscheme

a. light absorbed by (photosynthetic) pigments;

b. chlorophyll absorbs blue and red / drawing of absorption spectrum for chlorophyll;

c. photosystems are groups of pigment molecules/are light harvesting complexes;

d. photosystems are located in thylakoid membranes;

e. electrons excited/raised to higher energy level;

Examiners report

As this question was near the end of Section A, the mark scheme was constructed so as to reward stronger answers, rather than simple ideas such as ‘light is absorbed by chlorophyll’. Answers were very varied. Few candidates including any ideas about photosystems.

Syllabus sections