Question

Why we say that Ulva has isomorphic alternation of generation ?

Answer 1

Because Ulva perform both sexual and asexual reproduction that's why it has isomorphic alternation of generation

Answer 2

Alternation of generations (also known as metagenesis) is the type of life cycle that occurs in those plants and algae in the Archaeplastida and the Heterokontophyta that have distinct sexual haploid and asexual diploid stages. In these groups, a multicellular gametophyte, which is haploid with nchromosomes, alternates with a multicellular sporophyte, which is diploid with 2nchromosomes, made up of n pairs. A mature sporophyte produces spores by meiosis, a process which reduces the number of chromosomes to half, from 2n to n.