The Power point presentation
on ‘heterotrophic plants'
VIII – D
ROLL NO. - 16
R.D.J.P. SCHOOL, 23, RAJPUR ROAD, DELHI - 54
‘Heteron’ means (an) other
‘trophe’ means nutrition
Organisms which have
heterotrophic mode of nutrition
are called heterotrophs.
The mode of nutrition in which
organisms cannot manufacture food
and have to depend upon other
plants and animals to obtain energy
is called heterophic nutrition.
According to the mode of nutrition,
heterotrophic plants are of the
1. Parasitic plants
2. Saprophytic plants
3. Insectivorous plants
4. Symbiotic plants
Parasitic plants are those
which absorb food from
another growing green plant,
called the host.
1. Mistletoe has leathery green leaves, and
so they can make their own food. But
they depend on the host for minerals
1.Cuscuta has a short root and a long, thread-
like stem. It twines around the host stem and
sends branches around neighbouring stems
giving the appearance of a mass of noodles or
Saprophytic plants are usually
whitish, but can have brightly
coloured flowers. These plants
have no green leaves; often
they even have on leaves at all.
Indian pipe is found commonly in
Asia and throughout North
Coral root are found in forest
environments around the world.
Insectivorous plant are
plants that derive some or
most of their nutrients by
trapping and consuming
animals, mainly insects.
In the pitcher plant the leaves is modified to from a tubular pitcher-like
structure.The inside of the pitcher is lined with downward pointing
hairs.These hairs do not allow any insect to climb back up and escape.
The fluid at the bottom of the pitcher contains digestive juices that
digest the insect.
Among the carnivorous plants the biggest, and the most amazing, are
the vines known as the tropical pitcher plants.They have been known
to capture and eat not only insects but also frogs and rarely even
rodents.They are mainly found in southeast Asia, the majority of them
in the island of Borneo.
The slender leaves of bladderworts bear a
large number of very small , pear-shaped
bladders . this opens a prey is sucked in
within one-thousandth of a second.
The leaves of sundew have tentacles with
drops of a sticky substance called mucilage
at the ends; insects get stuck in this
substance and become entangled.The
helpless insect then gets digested.
The trap of the Venus flytrap is a highly
modified leaf. On the inner surface (reddish
here to attract insects) there are sort, stiff
hairs. When anything touches these hairs,
the two lobes of the leaves snap shut in less
than a second.
Plants which live in association
with other species for food
resources are called symbiotic
Lichens are an association between a fungus and a
microscopic plant-green algae. The fungus obtains
nutrients from the algae, and the fungus in turn
provides shelter to the algae, so that it can grow in
harsh condition like rock surface where it would
otherwise not survive.
Roots of certain plants such as peas contain
bacteria called Rhizobium. Rhizobium
converts atmospheric nitrogen into plant-
usable forms, e.g., ammonia. The plant in
turn provides nutrient for the bacteria’s