Question

What are 3 important steps observed during the progression from simple to more complex organisms within the Chlorophytes? Include details (morphology, reproduction, etc) and an example of a Chlorophyte genus in which each step can be observed going from simple to intermediate and then most complex.

Answer 1

Morphology

• Morphological diversity of the green algae ranges from tiny flagellates to multicellular macroscopic organisms.
• I think all known cell types and life forms are present in the green algae: unicellular flagellates, non-flagellate unicells .motile colonies, nonmotile colonies, colonies of regular size and shape known as coenobia, un- branched filaments, branched filaments like.
• Non motile-Palmella
• Motile-eudoria
• Colonial- pediastrum
• Filamentous-spirogyra
• Multicellular - ulva
• So there is lot of variation from simple to complex chlorophytes from non motile to multicellular complex like ulva.

There is lot of variation in reproduction of chlorophytes.

• Unicellular alga reproduce by asexual means by aplanospore formation in simple chlorophytes
• Motile algae reproduce by zoospore formation.
• Nonmotile by aplanospore.
• Colonial type by colony fragmentation.
• In higher chlorophytes such as spirogyra chlorochets sexual reproduction ocxure by isogamous, unisogamous and oogamous by forming gametes in gametangia.or by the process of conjugation.

Origins of simple and complex plastids via primary and secondary endosymbioses.

Uniceullar to colonial to multicellular are three stages of progression in chlorophytes drom simple to complex.