Because the talk about "multiple items," thus the plural. But: The potato is a vegetable. A potato is a vegetable.
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Nona The BritNo, broccoli is not a plural - 'broccoli are vegetables' is incorrect.I see your point.
Yoong LiatIf I'm not mistaken, Believer's question has not been answered.IMO:
He wants to know why, according to the Collin's Dictionary, 'Potatoes are vegetables with brown or red skins and white insides' and not 'Potatoes are a vegetable with brown or red skins and white insides'