1.
MOHAMMED VALIKARIMWALA
FERGUSSON COLLEGE, PUNE

2.
Algae
Introduction:
Algaeare mostly aquatic plants (they can be present in marine or fresh
water), some being terrestrial also.
The study of algae is known as Phycology/Algalogy.
They have a vegetative structure (thalloidal).
Most of them are free-living while some are symbiotic.

3.
Algae…
• Most live in water attached to rocks
for free floating.
• Use sunlight for photosynthesis
• Main food producers in the oceans.
• Important suppliers of oxygen.
Diatoms – used in
detergents, paint
removers, toothpaste
Golden algae

4.
Characteristics of Algae
They maybe small, unicellular, microscopic like Chlorella (non-
motile), Chlamydomonas (motile), or multicellular unbranched
filamentous like Spirogyra, or branched filamentous like Chara or
huge macroscopic such as sea weeds like Sargassum measure
more than 60 meters in length.

5.
Classification ofAlgae
• The four algal phyla are:
Phaeophyta (Brown algae) - Eg: Fucus,
Sargassum,etc.
Chlorophyta (Green Algae) - Eg: volvox, spirogyra,etc.
Cyanophyta (Blue-Green Algae) –Eg: Nostoc,
anabeana,etc.
Rhodophyta (Red Algae)- Eg: gelidium, Porphyra,etc.

6.
SEXUAL AND ASEXUAL REPRODUCTION IN ALGAE
(CHLAMYDOMONAS)

7.
Spirogyra reproduce sexually by
conjugation

8.
BIOFUEL PRODUCTION
FROM ALGAE

9.
• “Green” Buildings
• Biofuel Vehicles
Future Aspects
How It Works
To be specific, it’s actually microalgae.
Though it looks like green scum or strands
of hair floating on the water, microalgae is
actually made up of microscopic, single-
celled organisms capable of
photosynthesis, like plants. They slurp in
sunlight, and convert it to energy. They’re
also able to suck up carbon dioxide
emitted by power plants and cars, turning it
into oxygen. This is better for the
environment than fossil fuels, because it’s
carbon neutral: The plants draw down as

10.
Economic Importance: Algae

11.
Agar-Agar
• It is dried, jellylike, non-nitrogenious.
• It is used as a base of culture media in laboratory for culturing
microorganisms
• Its food value and ability to afford good range of temperature for
culturing
Alginates:
• The alginates are used in Rubber-tyre industry, Paints, ice-creams, and
in presentation of flame-proof fabrics and plasticparticles

12.
Antibiotics and Medicines
• Some algae yield antibiotics e-g, Chlorellin Is
obtained from green alga Chlorella, that
inhibits the growth of certainbacteria.
• Brown algae is used in manufacture of
various goiter madicines

13.
• Treat the illness:
• with a multi-drug called Coartem.
• It contains sweet wormwood which is an important natural herb.
• It is unfortunately quite expensive.
• It is a 3 day course.
• Kill the mosquitoes:
• insecticide-treated mosquito nets act as a physical barrier and actively kill the
mosquitoes.
• Spraying with DDT, a repellent. This is, however, harmful to the
environment.

14.
Harmful Aspects of algae
• Water blooms
• Death of living
organisms
• Diseases in human beings
Parasitic Activities

15.
Thank you…