Are able to synthesize their
own organic food from
inorganic substances
They use CO2 for obtaing
carbon and utilise some
substances as the resource
oh hydrogen to reduce
carbon
this
subtances
could be
hidrogen
sulphide (H2S)
ammonia
(NH3)
There are two types
Photoautotrophic
Posses photosynthetic
pigments in membrane
and utilise solar energy
CO2 + H2S ---- sugar + sulphur + water
Chemosyntethic
Manofacture organic
compounds from inorganic
raw materials utilising
energy liberated from the
oxidation of inorganic
substances
could
be
nitrifying
sulphur
iron
HETEROTROPHIC
Are unable to manufacture
their own organic food and
hence are dependent on
external source
Saprophytic Bacteria
These bacteria obtain
their nutritional
requirements from
dead organic matter
These bacteria have a
significant role in the
ecosystem, functioning as
decomposers.
symbiotic bacteria
bacteria which live in
a mutually beneficial association
with other organisms.
bacteria derive
nutrients from their host
and in that process
help the host through of
their biological activities
parasitic bacteria
These are bacteria which occur in the body
of animals and plants, obtaining their
organic food from there. Most of these
bacteria are pathogenic, causing serious
diseases in the host organisms either by
exploiting them or by releasing poisonous
secretions called toxins.