definition properties image REDALAGE BROWNALAGE GREEN ALAGE USE OF ALAGE KEY FEATUEW

1. Algae :
An informal term for a diverse group of
photosynthetic eukaryotes
Presented by :Khushbu’s Microbiology

2. Algae :Introduction
 Algae :/ˈældʒi, ˈælɡi/
 singular alga /ˈælɡə/
 Informal term for a large and diverse group
of photosynthetic eukaryotic organisms.
 It is a polyphyletic grouping that includes
species from multiple distinct clades.
 Image of
Red Algae:

3. Algae :Definition
• No definition of algae is generally accepted.
• One definition is that algae "have chlorophyll as
their primary photosynthetic pigment and lack a
sterile covering of cells around their
reproductive cells".
• Although cyanobacteria :often referred to as
"blue-green algae", most authorities exclude
all prokaryotes from the definition of algae

4. ALGAE :KEY FEATURE
 Range from
 unicellular microalgae: such as chlorella & the diatoms,
 multicellular forms: giant kelp
 A large brown alga length :
may grow up to50 metres -160 ft
 Most are aquatic and autotrophic and lack many of the
distinct cell and tissue types :stomata, xylam & phloem
which are found in land plant.
 The largest & most complex marine algae : seaweeds
 Most complex freshwater forms : charophyta,
a division of green algae.

5. Green algae
 Green algae: examples of algae that have
primary chloroplasts
derived from endosymbiotic cyanobacteria.
 Stigeoclonium : a chlorophyte green alga genus

6. Red algae
Red algae or rhodophyta: oldest groups of eukaryotic
algae.
 One of the largest phyla of algae
 Containing over 7,000 currently recognized species
with taxonomic revisions .
 Scientific name: Rhodophyta
 Phylum: Rhodophyta; Wettstein, 1922
 Higher classification:
 Archaeplastida
 Rank: Phylum

7. Brown Algae
 Comprising the class Phaeophyceae,
 large group of multicellular algae,
 including many seaweeds located
 in colder waters within the
 Northern Hemisphere.
 Most live :
 marine environments,
 play an important role :
 as food and as a potential habitat.
 Image of Brown algae:
Giant kelp (Macrocystis pyrifera)

8. Uses of Algae :
 Agar: gelatinous substance derived from red algae
 Alginic acid or alginate: extracted from brown algae. Uses range
from gelling agents in food, to medical dressings.
 Energy source :algae fuel, biological hydrogen
production, biohydrogen, biodiesel, ethanol fuel, butanol
fuel, vegetable oil, biogasFertilizer :
 Soil conditioners
 Nutrition : Chlorella ; a green algae and the vitamin-c
supplement from dunaliella, high in beta-carotene.
 Pollution control :
 Bioremediation
 Stabilizing substances :Carrageenan and Chondrus crispus

9. THANKS