question_answer 71)

  A multi cellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has (a) haploid vegetative cells and diploid gometangia (b) diploid vegetative cells and diploid gometangia (c) diploid vegetative cells and haploid gometangia (d) haploid vegetative eel Is-and haploid gometangia

Answer:

                  (d) A multicellular gametophyte (gametangia), which is haploid (n) alternates with a multicellular sporophyte, which is diploid (2n). A mature sporophyte produces spores(haploid cells) by meiosis, a process which reduces the number of chromosomes to half, from 2n to n.Gametophyte (n)