Question

For each of the three types of life cycles what is the respective ploidy of the individual that represents the adult or lasting form?

Answer 1

In the haplontic haplobiontic life cycle the single and lasting form is haploid. In the diplontic haplobiontic life cycle it is diploid. In the diplobiontic life cycle the lasting individual that alternates with the intermediate form may be the haploid gametophyte (as in bryophytes) or the diploid sporophyte (as in pteridophytes)