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What does a biennial weed do?

  1. Grows and dies in one year

  2. Seeds the second summer and dies in the winter

  3. Remains vegetative indefinitely

  4. Flowers and seeds in its first year

The correct answer is: Seeds the second summer and dies in the winter

Biennial weeds are plants that take two years to complete their life cycle. During the first year, biennials grow vegetatively and store food in their roots. During the second year, biennials use their stored food to produce flowers and seeds before dying in the winter. This means that A, C, and D are incorrect because those are not the characteristics of a biennial weed. A is incorrect because biennial weeds do not die in one year - they need two years to complete their life cycle. C is incorrect because biennials eventually produce flowers and seeds in their second year, rather than staying vegetative indefinitely. And D is incorrect because biennials do not flower and seed in their first year, but rather in their second year.