Scince presentation meghansh


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Scince presentation meghansh

  1. 1. The Power point presentation on ‘heterotrophic plants' Prepared by MEGHANSHGAUTAM VIII – D ROLL NO. - 16 R.D.J.P. SCHOOL, 23, RAJPUR ROAD, DELHI - 54
  2. 2.  ‘Heteron’ means (an) other ‘trophe’ means nutrition  Organisms which have heterotrophic mode of nutrition are called heterotrophs.
  3. 3. 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.
  4. 4. According to the mode of nutrition, heterotrophic plants are of the following types: 1. Parasitic plants 2. Saprophytic plants 3. Insectivorous plants 4. Symbiotic plants
  5. 5. Parasitic plants are those which absorb food from another growing green plant, called the host.
  6. 6. 1. Mistletoe has leathery green leaves, and so they can make their own food. But they depend on the host for minerals and water.
  7. 7. 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 spaghettis.
  8. 8.  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.
  9. 9.  Indian pipe is found commonly in Asia and throughout North America.
  10. 10.  Coral root are found in forest environments around the world.
  11. 11. Insectivorous plant are plants that derive some or most of their nutrients by trapping and consuming animals, mainly insects.
  12. 12.  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.
  13. 13.  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.
  14. 14.  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.
  15. 15.  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.
  16. 16.  Plants which live in association with other species for food resources are called symbiotic plants.
  17. 17.  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.
  18. 18.  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 growth.