- Xanthophyceae – Oil
- Chrysophyceae -Fat and leucosin
- Mannitol and laminarin-Phaeophyceae
- Bacillariophyceae -Fat and volutin
Thallus Structure in Algae
—–
- Many
Rhodophyceae members
can achieve high degree of thallus development. But some of them are
unicellular. - Unicellular red algae : Porphyridium and Chroothece
- Algal group containing oil, lipid and lucosin
as the reserved food materials:
Xanthophycophyta - Laminarin-
Reserve food in Phaeophyceae - MOP
Iyengar – Fampous Indian Phcologist - Sea
lettuce: Ulva - Reticulate
Chloroplast: Oedogonium,
Spirogyra , Hydrodictyon. - Mitochondria are absent in Blue
green algae - Alga with unbranched thallus: Zygnema
- Pandorina belongs Volvocales
- Palmella stage – Volvox
- Gongrosira-Vaucheria
- Chantansia- Bactrachospermum
- Zygotic meiosis:Algae
- In Euglena
the effective stroke and the recovery stroke results in Forward movement
associated with rotation around its axis - The mode of
nutrition in Vorticella is Holozoic - Bioluminescence is usually associated with Pyrrophyta
- Cyanobacteria
form a variety of associations with bryophytes ranging from the almost
accidental to close symbioses. Anthoceros ,the bryophyte that possesses this
property - The exact
role of the hetercysts in blue green algae? Nitrogen fixation - Green algal
life cycle, where the somatic phase (plant) is haploid (gametophyte) while the
diploid phase (sporophyte) is represented by zygote is called Haplontic, found in.
Ulothrix - algal
division never produces motile, flagellated cells among any of its members: Rhodophyta
Classification of Algae by Fritsch
- Source of salad -Ulva
- Source of iodine – Laminaria
- Material for photosynthesis research –
Chlorella - To study nuclecytoplasmic interactions
– Acetabularia - Carrageenin is obtained from the cell walls of
algae: Chondrus
crispus (Irish moss) - Chlorella
will fulfill the
need of all vitamins except Ascorbic
acid - Laminaria
algae gives iodine - Agar-Gelidium, Graciliaria, Gigartina
Chlamydomonas
- Isogamy, Anisogamy and Oogamy are
found in different species of Chlamydomonas. - Antheridia
and archaegonia are Sexual microgametes of Chlamydomonas.
Oedogonium
- Asexual reproduction takes place by
multi- flagellate zoospore, where flagella are arranged around the beak-like
apical region. - Nannandrous species are always
dioecious (heterothallic) i.e., antheridia and oogonia are borne on different
filaments. In this type the antheridia develop on a very small filament termed
as dwarf male or nannandrium. - The androspores, antherozoids and zoospores
are morphologically alike but differ in their size and numbers
Polysiphonia
- Polysiphonia, a red algae possess
highly branched filaments each with a central axial filament supporting
pericentral cells. The number of pericentral cells is 4–24. - The diploid zygote develops to become
the carposporophyte, this is a separate phase of the life-cycle and is entirely
parasitic on the female - The tetrasporophyte is diploid and
produced spores in fours after meiosis - Branches of limited growth are called trichoblasts,
spirally arranged, dichotomously branched, colourless and may develop both from
main axis and long branches. - The diploid part of the cystocarp
represents the carposporophyte. The carposporangium develops single
diploid carpospores. - The non motile male spermatia are
carried to the female by means of water currents in Polysiphonia
