Question

Which of the following types of algae shows a distinct alternation of generations?Select one of the options below as your answer:A. Chlorophytes B. PhaeophytesC. Chrysophytes

Answer 1

Help

Answer 2

Eh, doesnt this bring sweet memories of Botany 101 :)
So, Chlorophyta is green algae, Phaeophyta is brown algae and Chrysophytes - golden algae.
So, Chrysophytes are out they dont have distinct alternation.

What is this alternation of generations anyway ? Alternation of generations refers specifically to the alternation between multicellular haploid life stages and multicellular diploid life stages. The key feature is that both the diploid and haploid stages are multicellular. Diploid forms (sporophytes) produce haploid spores, which divide and develop directly into multicellular haploid structures (gametophytes). Gametophytes then produce haploid gametes, which join with other gametes to form diploid sporophytes once again. In other words, the diploid and haploid generations alternate, over and over. In some organisms the diploid stage is the dominant form that is responsible for the majority of growth and resource acquisition, whereas in others (e.g., fungi) the haploid stage is dominant.
I bet that sound confusing. This is most typical of phaeophytes (remember the brown algae Laminaria if you ever stepped into a botany lab).
Chlorophytes also exhibit alternation of generation (some of them), in Ulva (the sea lettuce) it is however isomorphic alternation - haploid and diploid forms that are structurally similar.

Answer 3

thanks