Biology · Paper 1A · SL

May 2025 TZ1

A video for every question in the Biology Paper 1A SL paper from May 2025 TZ1. Each one goes through the question and the thinking behind it, so you can see where your approach differed. Attempt the paper first, then use the grid to jump to whichever questions you need.

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16

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Question 18

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Question 26

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Question 28

Question 29

Question 30

About this paper

Biology Paper 1A at SL has 30 questions and is sat under exam conditions. It covers recall and application across the core syllabus; SL papers stay within the core.

Studying this paper

Don't work through the videos in order. Mark your attempt, then watch only the questions you missed plus the ones you got right on a guess, those are the ones most likely to cost you marks for real. If the misses cluster in one topic, go back to the theory before starting another paper.