Q. Which culture spread Dioscorea alata across Pacific Islands?
Answer: Austronesian
Notes: Austronesian voyagers spread Dioscorea alata (purple yam) across the Pacific, New Zealand, Madagascar, and Comoros. Domesticated in New Guinea over 10,000 years ago and expanded during the Lapita cultural period, this yam is a key crop in Island Southeast Asia and Oceania.
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