O Levels Biology (5090)•5090/12/M/J/19

Explanation
Seed germination mass transfers support all statements
Steps:
- Whole seed mass decreases from 205 mg to 148 mg, showing overall mass loss during germination.
- Cotyledon mass drops from 180 mg to 115 mg while radicle/plumule mass rises from 2 mg to 21 mg, indicating nutrient transfer.
- The difference between whole seed and (cotyledons + embryo) masses suggests minimal other structures, as data focuses on these components.
- Mass loss in whole seeds implies respiration, where stored food provides energy and releases CO2.
Why A is correct:
- Data shows cotyledon depletion fueling embryo growth (statement 1), accounts only for listed structures in whole seeds (statement 2), and total mass loss requires food for energy/CO2 production via respiration (statement 3).
Why the others are wrong:
- B omits statement 3, but mass loss supports energy/CO2 role.
- C omits statement 2, but data implies no significant other structures.
- D omits statement 1, but cotyledon-embryo mass shift directly supports it.
Final answer: A
Topic: Sexual reproduction in plants
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