AP Biology · Free-response questions 2023

6 questions, each with its course unit and the official scoring guidelines.

Official paper (PDF) · QuestionsAll AP Bio papers→

Question 2

Open answer
Question 2 — 2. Elevated levels of CO2 increase the rate of photosynthesis and growth in plants. Scientists studying the mechanisms involved in these increases examined a variety of species and found that when plants are exposed to…

Source: College Board — AP Biology, Free-response questions, 2023

Question 3

Open answer
Question 3 — __________________________________________________________ 3. Sand lances of the genus Ammodytes are small fish that function as keystone organisms in several coastal ecosystems. These sand lances are prey fish that…

Source: College Board — AP Biology, Free-response questions, 2023

Question 4

Open answer
Question 4 — __________________________________________________________ 4. Noncyclic electron flow and cyclic electron flow are two major pathways of the light-dependent reactions of photosynthesis. In noncyclic electron flow,…

Source: College Board — AP Biology, Free-response questions, 2023

Question 5

Open answer
Question 5 — 5. Ruminants are hoofed animals, including cattle and sheep, that have a unique four-chambered stomach specialized to digest tough, fiber-filled grasses. Researchers studying ruminants are investigating the…

Source: College Board — AP Biology, Free-response questions, 2023

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