ALGAE

Plants thriving in water

GREEN ALGAE

SPYROGYRA

- POPULATING THE PONDS

RED ALGAE

- SOURCE OF AGAR

BROWN ALGAE

- SOURCE OF ALGIN

BLUE GREEN ALGAE

PLANTS THAT SWIM

- CHLAMYDOMONAS

OSCILLATARIA

AN EXCEPTONAL

BEAUTY

- PEDIASTRUM

THALLUS

FRAGMENTATION

FORMATION OF

DAUGHTER COLONIES

……IN VOLVOX

ZOOSPORE FORMATION

…..IN ULOTRIX

CHLAMIDOMONAS

ISOGAMY IN SPIROGYRA

DIFFERENT STAGES

• A. Resting filaments of alga cells.• B.  Formation of conjugation tubes between two

adjacent filaments.• C. Cytoplasmic contents of each cell form a

compact mass, representing an isogamete.  The isogametes from one filament migrate through the conjugation tubes into the adjacent filament.

• D. The two isogametes unite to form a zygote.  Each zygote eventually undergoes meiosis to form four haploid cells.  One haploid cell will form a new filament by mitosis, the other three degenerate.

CONJUGAL TUBES

HETEROGAMY

HETEROGAMY IN OEDOGONIUM

CHLORELLA

- YIELDS CHLORELLIN

AGAR

- MEDICINE FROM RED ALGAE

FROM BROWN ALGAE

KELP

- A RICH SOURCE OF IODINE

NOSTOC AND…

… ANABAENA

- NITROGEN FIXATION

SEA WEEDS….

….AS MANURE

CHONDRUS

- USED IN PUDDINGS AND

JELLIES

CHLORELLA

- RICH IN PROTEINS AND VITAMINS

- A CHINESE DELICACY

LAMINARIA

- FODDER