Free worked solutions · 2026 Edition

Worked solutions: Photon Biology: Study Guide for the IB Diploma (SL & HL)

Full worked solutions to every practice question in Photon Biology: Study Guide for the IB Diploma (SL & HL), one page per topic. Free, no sign-up.

40 syllabus topics
Tools, inquiry and the exam
1125 questions
Full worked solutions
Free, no sign-up

Start at A1.1 Water About the book

Choose a topic

Scan the QR code in any topic of the book, or pick the topic here. Try each question first, then open its solution and compare your working line by line, marks included.

Unity and diversity

Theme A · Topics A1 to A4

Form and function

Theme B · Topics B1 to B4

Interaction and interdependence

Theme C · Topics C1 to C4

Continuity and change

Theme D · Topics D1 to D4

Tools, inquiry and the exam

Skills across the course

How to use the solutions

Mark your own work like an examiner

Each solution is written as an IB mark scheme: M1 for a method mark, A1 for an answer mark that depends on the method, R1 for reasoning and AG where the answer is given in the question. Where your method differs, check that each of your lines would earn the same marks.

The questions are in Photon Biology: Study Guide for the IB Diploma (SL & HL). Work through Basic practice, Tutorial practice and Advanced practice, following the order in the book.