IB BIOLOGY CLASSIFICATION KEY ACTUAL EXAM PAPER 2026 QUESTIONS WITH SOLUTIONS GRADED A+

IB BIOLOGY CLASSIFICATION KEY
EXAMINATION TEST 2026 QUESTIONS WITH
ANSWERS GRADED A+


◉ Mammals. Answer: Internal fertilization; give birth to live young;
mammary glands


◉ Mammals. Answer: Hair grows from skin; teeth including living
tissue


◉ Birds. Answer: Lungs with parabronchial tubes


◉ Birds. Answer: Internal fertilization; Hard shells around the eggs


◉ Birds. Answer: Feathers grow from skin; beak but no teeth


◉ Reptiles. Answer: Lungs with extensive folding


◉ Reptiles. Answer: Internal fertilization; soft shells around eggs

, ◉ Reptiles. Answer: Dry scaly impermeable skin; simple teeth - no
living tissue


◉ Amphibians. Answer: Simple lungs with small internal folds and
moist surfaces


◉ Amphibians. Answer: External fertilization in water; protective jelly
around eggs; larval stage lives in water


◉ Amphibians. Answer: Soft moist permeable skin


◉ Fish. Answer: Gills


◉ Fish. Answer: External fertilization in most species


◉ Fish. Answer: Scales grow from skin; single gill slit; swim bladder for
buoyancy


◉ Bryophytes. Answer: Mosses, hornworts & liverworts


◉ Bryophytes. Answer: No true roots, stems or leaves; Non-vascular
plants