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Phycology(BMIC 362)
Prof Dr. Zakaria A.
Mohamed
Classification of
Chlorophyta (green algae)
10/5/2023 2
Order: Volvocales
General features
1. Forms are unicellular or colonies.
2. Forms are motile.
3. Most species are freshwater
Family: Chlamydomondaceae
e.g. Chlamydomonas
Habit: motile Unicellular
Asexual Reproduction;
Zoospores & Aplanospores
Sexual Reproduction:
isogamy & anisogamy
Life cycle: Haplontic
-
10/5/2023 3
Life cycle of Chlamydomonas
10/5/2023 4
Family Volvocaceae
Pandorina
Habit: motile colony
Asexual Reproduction: Daughter colonies
Sexual reproduction: Anisogamy
Life cycle: Haplontic
Eudorina
Habit: motile colony
Asexual reproduction: daughter colonies -
Sexual Reproduction: Anisogamy
Life Cycle: Haplontic
10/5/2023 5
Volvox
Habit: motile colony
Asexual Reproduction: daughter colonies
Sexual reproduction: Advanced Oogamy
Life cycle: haplontic
- Volvox contains different kinds of cells:
1. Vegetative cells (Movement & photosynthesis)
2. Asexual cells (Asexual Reproduction).
3. Sexual cells (Sexual reproduction).
10/5/2023 6
Order Chlorococcales
General features
The forms are unicellular or colonies
- the forms are nonmotile
-Family Chlorellaceae
Chlorella
Habit: nonmotile unicellular
Asexual reproduction: Autospores
Sexual reproduction: absent
10/5/2023 7
Life cycle of Chlorella
- During the formation of autospores, 4 important
phases in the life cycle of chlorella are recognized:
1. Growth phase
- the autospores increased in the size.
2. Early ripening phase
- The cells prepare themselves for undergoing cell
division
3. Post ripening phase
-the cells divide twice in light or darkness
4. Division phase
The wall of parent cell is ruptured and the autospores
liberate
10/5/2023 8
Life cycle of Chlorella
Da = Dark active cells
Dn = Dark nascent cells
D-L= dark to light transitional cells
L1= large cells with DNA
L2 = Dividing cells
L3 = Tetranucleate cells
L4=
Tetranucleate autospore
mother cells
10/5/2023 9
Family Hydrodictyaceae
Pediastrum
Habit: nonmotile colony
Asexual reproduction: zoospores
Sexual reproduction: isogamy, and the formation of
Polyhedron
Life cycle: haplontic
10/5/2023 10
Sexual reproduction in Pediastrum
10/5/2023 11
Hydrodictyon
Habit: nonmotile colony
Asexual reproduction: zoospores
Sexual reproduction: isogamy, and the formation of
Polyhedron
10/5/2023 12
Sexual reproduction in Hydrodictyon
10/5/2023 13
Polyhedron
This is a polyhedral structure formed during
the sexual reproduction by the metamorphism
of a zoospore.-
Metamorphism
The arrangement of zoospores in the form of a parent
alga.
10/5/2023 14

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Lecture 5.pptx

  • 1. Phycology(BMIC 362) Prof Dr. Zakaria A. Mohamed
  • 3. Order: Volvocales General features 1. Forms are unicellular or colonies. 2. Forms are motile. 3. Most species are freshwater Family: Chlamydomondaceae e.g. Chlamydomonas Habit: motile Unicellular Asexual Reproduction; Zoospores & Aplanospores Sexual Reproduction: isogamy & anisogamy Life cycle: Haplontic - 10/5/2023 3
  • 4. Life cycle of Chlamydomonas 10/5/2023 4
  • 5. Family Volvocaceae Pandorina Habit: motile colony Asexual Reproduction: Daughter colonies Sexual reproduction: Anisogamy Life cycle: Haplontic Eudorina Habit: motile colony Asexual reproduction: daughter colonies - Sexual Reproduction: Anisogamy Life Cycle: Haplontic 10/5/2023 5
  • 6. Volvox Habit: motile colony Asexual Reproduction: daughter colonies Sexual reproduction: Advanced Oogamy Life cycle: haplontic - Volvox contains different kinds of cells: 1. Vegetative cells (Movement & photosynthesis) 2. Asexual cells (Asexual Reproduction). 3. Sexual cells (Sexual reproduction). 10/5/2023 6
  • 7. Order Chlorococcales General features The forms are unicellular or colonies - the forms are nonmotile -Family Chlorellaceae Chlorella Habit: nonmotile unicellular Asexual reproduction: Autospores Sexual reproduction: absent 10/5/2023 7
  • 8. Life cycle of Chlorella - During the formation of autospores, 4 important phases in the life cycle of chlorella are recognized: 1. Growth phase - the autospores increased in the size. 2. Early ripening phase - The cells prepare themselves for undergoing cell division 3. Post ripening phase -the cells divide twice in light or darkness 4. Division phase The wall of parent cell is ruptured and the autospores liberate 10/5/2023 8
  • 9. Life cycle of Chlorella Da = Dark active cells Dn = Dark nascent cells D-L= dark to light transitional cells L1= large cells with DNA L2 = Dividing cells L3 = Tetranucleate cells L4= Tetranucleate autospore mother cells 10/5/2023 9
  • 10. Family Hydrodictyaceae Pediastrum Habit: nonmotile colony Asexual reproduction: zoospores Sexual reproduction: isogamy, and the formation of Polyhedron Life cycle: haplontic 10/5/2023 10
  • 11. Sexual reproduction in Pediastrum 10/5/2023 11
  • 12. Hydrodictyon Habit: nonmotile colony Asexual reproduction: zoospores Sexual reproduction: isogamy, and the formation of Polyhedron 10/5/2023 12
  • 13. Sexual reproduction in Hydrodictyon 10/5/2023 13
  • 14. Polyhedron This is a polyhedral structure formed during the sexual reproduction by the metamorphism of a zoospore.- Metamorphism The arrangement of zoospores in the form of a parent alga. 10/5/2023 14