TYPES OF FOOD CHAIN

1.GRAZING OR PREDACTORY FOOD CHAIN:
(a) THESE ARE DIRECTLY DEPENDS UPON SOLAR RADIATION AS THE PRIMARY SOURCE OF ENERGY.
(b) GREEN PLANTS OR PRODUCERS FORM THE FIRST TROPHIC LEVEL OF FOOD CHAIN . THEY SYNTHETHIS THEIR FOOD BY THE PROCESS OF PHOTOSYNETHETIS.
(c) HERBIVOROUS Or PRIMARY CONSUMERS EAT UPON THE PRODUCERS AND FORM THE SECOND TROPHIC LEVEL.
(d) HERBIVOROUS ARE EATEN BY CARNIVOROUS THESE ARE LONGER FOOD CHAIN.
eg. AUTOTROPHS - HERBIVORE - PRIMARY CONSUMERS - SECONDARY CONSUMERS .

2 .DETRITUS / SAPROPHYTIC FOOD CHAIN :
PRIMARY SOURCE OF DETRITUS FOOD CHAIN IS DEAD ORGANIC MATTER WHICH IS KNOWN AS DETRITUS . MAIN SOURCE OF DEAD ORGANIC MATTER ARE FALLEN LEAVES OR DEAD ANIMAL BODIES .PRIMARY CONSUMERS ARE DETRITIVORES. THESE INCLUDES BACTERIA , FUNGI  THESE ARE SHORTER THAN GRAZING FOOD CHAIN THEY INTURN PRAYED UPON BY SEVERAL SMALL INSECT 

eg . LEAF LITLER - ALGAE - CRABS - SMALL CARNIVOROUS - FISH - LARGE CARNIVOROUS FISH

3. PARASITIC FOOD CHAIN : THESE FOOD CHAIN STARTS FROM HERBIVOROUS BUT FOOD ENERGY PASSES FROM LARGE TO SMALL ORGANISM . LARGE ANIMAL IS CONSIDERED AS HOST SMALLER ORGANISM IS CONSIDERED AS PARASTIC 

eg . COW- WORM - PROTOZOA