select o5 group of multicellular algae, and describe its life cycle. select one group of multicellular...

select o5 group of multicellular algae, and describe its life cycle.

select one group of multicellular algae, and describe its life cycle.

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Expert Solution

VOLVOX LIFE CYCLE

Volvox is a multicellular algae that has a haplontic life cycle.
The dominant stage of volvox is free-living haploid (n) gametophyte and the sporophyte is represented only by the diploid zygote (2n).
Volvox shows the differentiation of both reproductive and somatic cells
The algae adopts asexual reproduction in favourable conditions and during unfavourable conditions they shift to sexual reproduction.
Asexual reproduction-The reproductive cells (gonidia) produce daughter colonies, which on maturation get released from the parent.
The gonidium then undergoes multiple division to form a colony.
Sexual reproduction is oogamous.The coenobia may be either monoecious or dioecious.
The male gamate is called spermatozoa and female gamates are known as ova.
Ova are large and non-motile and are A produced inside the oogonium.
Spermatozoa are produced inside the antheridium. The sperms have a spindle-shape and has a pair of apical cilia
Antherozoids move towards the oogonium by the chemotactic movement.
They enter the oogonia and oogonia one antherozoid fertilises the egg to form a diploid zygote
The Zygote forms a cyst .The zygote then detaches from the parent and remains dormant for a longer duration.
The zygote then undergoes meiotic cell division to form four haploid cells.
These haploid cells undergo multiple mitotic cell division to form a colony containing coenobium.

gladiator answered 1 year ago

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