heterotrotropic nutrition

The Power point presentation on ‘heterotrophic nutrition 'Prepared byRishabh jainVII – AROLL NO. - 32LITTLE FLOWERS INTERNATIONAL SCHOOL, KABIR NAGAR, DELHI

‘Heteron’ means (an) other‘trophe’ means nutrition

Organisms which haveheterotrophic mode of nutritionare called heterotrophs.

The mode of nutrition in whichorganisms cannot manufacture foodand have to depend upon otherplants and animals to obtain energyis called heterophic nutrition.

According to the mode of nutrition, heterotrophic plants are of the following types:

1. Parasitic plants2. Saprophytic plants3. Insectivorous plants4. Symbiotic plants

Parasitic plants are thosewhich absorb food fromanother growing green plant,called the host.

1. Mistletoe has leathery green leaves, andso they can make their own food. Butthey depend on the host for mineralsand water.

1.Cuscuta has a short root and a long, thread-like stem. It twines around the host stem andsends branches around neighbouring stemsgiving the appearance of a mass of noodles orspaghettis.

Saprophytic plants are usuallywhitish, but can have brightlycoloured flowers. These plantshave no green leaves; oftenthey even have on leaves at all.

Indian pipe is found commonly inAsia and throughout NorthAmerica.

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 alarge number of very small , pear-shapedbladders . this opens a prey is sucked inwithin 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 highlymodified leaf. On the inner surface (reddishhere to attract insects) there are sort, stiffhairs. When anything touches these hairs,the two lobes of the leaves snap shut in lessthan a second.

Plants which live in associationwith other species for foodresources are called symbioticplants.

Lichens are an association between a fungus and amicroscopic plant-green algae. The fungus obtainsnutrients from the algae, and the fungus in turnprovides shelter to the algae, so that it can grow inharsh condition like rock surface where it wouldotherwise not survive.

Roots of certain plants such as peas containbacteria called Rhizobium. Rhizobiumconverts atmospheric nitrogen into plant-usable forms, e.g., ammonia. The plant inturn provides nutrient for the bacteria’sgrowth.