Explore BrainMass
Share

Role of Chlorophyta in evolution of multicellular forms

1. What is the evolutionary significance of the Chlorophyta? Why is Chlamydomonas an important member of this group?

2.Describe and give examples of two separate paths by which multicellular organisms evolved from unicellular organisms.

3.Would you classify the Prostists as chemotrophs or phototrophs. Explain you answer.

4.What organism causes malaria? Describe its life cycle. Indicate which stage of the life cycle would be the easiest and most cost efficient to disrupt in order to control the spread of the disease.

5.List five differences between procaryotic cells and eucaryotic cells.

Solution Preview

1. What is the evolutionary significance of the Chlorophyta? Why is Chlamydomonas an important member of this group?
Ans : All algal group except red algae has evolved from chlorophyta. Chlamydomanas is important member of chlorophyta as it is believed that it act as algal stock for the evolution of rest of algae.

2.Describe and give examples of two separate paths by which multicellular organisms evolved from unicellular organisms.
Ans : Multicellular organism has evolved through following paths :-
a. Chlorococcine line : It evolved through Chlamydomonas by loss of flagella. The simplest chlorococcoid forms evolve along two lines, azoosporic and zoosporic. The former multiply by autospores (Chlorella) and later by zoospores (Chlorococcum). Apparantely the chlorococcine line proceeded in more than one direction. The series starts with Scenedesmus and culminates into multicellular Hydrodictyon. This line has led to evolution of coenocytic forms which reaches its climax in order siphonales.
b. Tetrasporine line : It evolved through ...

Solution Summary

All algal group except red algae has evolved from chlorophyta. Chlamydomanas is important member of chlorophyta as it is believed that it act as algal stock for the evolution of rest of algae.

$2.19