Question

ive the order for the life cycle of the hydrozoan, Obelia, starting with the polyp form.

Answers Growth into mature polyp Cells grow into Planula. Reproductive polyps form. Medusa buds. Meiosis occurs. Fertilization occurs. This question has already been posted but the given answer was wrong, I only have one more attempt plz help

Answer 1

Answer-

According to the given question-

Hydrozoa or hydrozoans are a division of class of phylum cnidaria that includes organisms which are small in size, have solitory as well as colony, salt loving , predatory animals.

Obelia is also called sea fur belongs to class Hydrozoa of phylum cidaria is a marine animal but some species lived in freshwater also and have characteristics features such as have both polyp as well as medusa stages in their life cycle.

Life cycle-

Reproduction in colony of polyp is asexual.During asexual reproduction the Obelia attaches to the surfaca of any substrate. mature colony have gastrozooids which helps in growth while the colony also have gonozooids which is called  reproductive polyp and have blastostyle and gonotheca.

When the medusae released from the gonozooids they are responsible for producing male medusae which are free swimming have velum with gonads, a mouth, as well as tentacles. now here sexual reproduction occur where the sperm as well as eggs are released after meiosis and later fertilized to form zygote which later converted into blastula. blastula is changes into swimming larva which have cilia are called planula. after some times the planula attaches with solid surface and changes into one feeding polyp. after some times the development polyps grow and produces other brances and form a new polyps through asexual budding.

so the correct order of the sequence will be as follow-

Reproductive polyps form---->>Medusa buds---->>Meiosis occurs---->>>Fertilization occurs---->>Cells grow into Planula------>>Growth into mature polyp