Correct answer: Mucor has biflagellate zoospores
Mucor is a zygomycete that produces non-motile sporangiospores, so it does not have biflagellate zoospores. The other statements are correct: gymnosperms typically have haploid endosperm, brown algae contain chlorophyll a, c and fucoxanthin, and archegonia occur in bryophytes, pteridophytes, and gymnosperms.