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FOOD CHAIN 
A food chain is a linear sequence of links in a food 
web starting from a species that are called producers in 
the web and ends at a species that is called 
decomposers species in the web. A food chain also 
shows how the organisms are related with each other 
by the food they eat. 
Food chains were first introduced by the African-Arab 
scientist and philosopher Al-Jahiz in the 9th century 
and later popularized in a book published in 1927 
by Charles Elton, which also introduced the food web 
concept.
Characteristics of a Food Chain 
In a food chain, 
a) there is repeated eating in which each group eats the 
smaller one and is eaten by the larger one. Thus, it 
involves a nutritive interaction between the biotic 
components of an ecosystem. 
b) the plants and animals which depend successively on 
one another form the limbs of a food chain. 
c) there is unidirectional flow of energy from sun to 
producers and then to a series of consumers of various 
types. Thus, a food chain is always straight and 
proceeds in a progressing straight line.
d) usually 80 to 90% of potential energy is lost as heat at 
each transfer on the basis of second law of 
thermodynamics (transformation of energy involves 
loss of unavailable energy). 
e) usually there are 4 or 5 trophic levels. Shorter food 
chains provide greater available energy and vice - 
versa. 
f ) omnivores occupy more than one trophic level and, 
some organisms occupy different trophic positions in 
different food chains.
FOOD CHAINS IN THE ECOSYSTEM SACRED GROVE
 Grass Grasshopper Frog Snake 
Grass Grasshopper Cock 
Vanda Worms Crow 
Grass Grasshopper Chameleon Owl 
Grass Grasshopper Rat Snake Eagle
Climbers Worms Frog Snake 
 
Mango Tree Squirrels Snake Eagle 
Grass Beetle Rat Snake

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FOOD CHAIN

  • 1.
  • 2. FOOD CHAIN A food chain is a linear sequence of links in a food web starting from a species that are called producers in the web and ends at a species that is called decomposers species in the web. A food chain also shows how the organisms are related with each other by the food they eat. Food chains were first introduced by the African-Arab scientist and philosopher Al-Jahiz in the 9th century and later popularized in a book published in 1927 by Charles Elton, which also introduced the food web concept.
  • 3. Characteristics of a Food Chain In a food chain, a) there is repeated eating in which each group eats the smaller one and is eaten by the larger one. Thus, it involves a nutritive interaction between the biotic components of an ecosystem. b) the plants and animals which depend successively on one another form the limbs of a food chain. c) there is unidirectional flow of energy from sun to producers and then to a series of consumers of various types. Thus, a food chain is always straight and proceeds in a progressing straight line.
  • 4. d) usually 80 to 90% of potential energy is lost as heat at each transfer on the basis of second law of thermodynamics (transformation of energy involves loss of unavailable energy). e) usually there are 4 or 5 trophic levels. Shorter food chains provide greater available energy and vice - versa. f ) omnivores occupy more than one trophic level and, some organisms occupy different trophic positions in different food chains.
  • 5. FOOD CHAINS IN THE ECOSYSTEM SACRED GROVE
  • 6.  Grass Grasshopper Frog Snake Grass Grasshopper Cock Vanda Worms Crow Grass Grasshopper Chameleon Owl Grass Grasshopper Rat Snake Eagle
  • 7. Climbers Worms Frog Snake  Mango Tree Squirrels Snake Eagle Grass Beetle Rat Snake