In a haplodiplontic life cycle (like mosses and ferns), the two multicellular phases are:
AHaploid only (the diploid is a brief zygote)
BBoth haploid gametophyte and diploid sporophyte
CDiploid only (the haploid is brief, just the gametes)
DTriploid + diploid alternation always
Answer & Solution
Correct answer: B. Both haploid gametophyte and diploid sporophyte
Haplodiplontic = BOTH gametophyte (n) AND sporophyte (2n) are multicellular. In mosses, gametophyte dominates; in ferns, sporophyte dominates. Spirogyra is haplontic; humans/seed plants are diplontic.
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