Home / IB DP Biology- A2.1 Origins of cells- IB Style Questions For HL Paper 1A

IB DP Biology- A2.1 Origins of cells- IB Style Questions For HL Paper 1A -FA 2025

IBDP Biology HL Paper 1 -FA 2025- All Chapters

Question

Which planet in the table falls within the “Goldilocks zone” and may be capable of sustaining extraterrestrial life?

PlanetTemperature / °CAtmosphereGravity / g
Kepler-22b−11 to 16unknown2.4
WASP-39b750hydrogen, helium and other elements25.0
Gliese 876d50 to 80high levels of toxic gases20.0
Kepler-16b−100unknown0.9
(A) Kepler-22b
(B) WASP-39b
(C) Gliese 876d
(D) Kepler-16b
▶️ Answer/Explanation
The “Goldilocks zone” implies temperatures where liquid water can exist. Kepler-22b shows a moderate range (−11 to 16 °C), while the others are either extremely hot (WASP-39b, Gliese 876d) or very cold (Kepler-16b).
✅ Answer: (A)

Question

The Miller–Urey experiment carried out in 1952 tested the hypothesis of the chemical origin of life. What were the key findings?

(A) Living cells could be produced from a mixture of chemicals.
(B) Complex organic molecules could form under simulated primordial conditions.
(C) Life could spontaneously emerge without external influence.
(D) DNA and RNA could self-replicate in a prebiotic environment.

▶️ Answer/Explanation
The Miller–Urey experiment simulated early Earth conditions using water vapor, methane, ammonia, and hydrogen gases exposed to electric sparks to mimic lightning. The experiment produced amino acids and other simple organic compounds, demonstrating that complex organic molecules could form naturally under prebiotic conditions.
✅ Answer: (B)
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