Introduction to heat waves and Heatwaves in Bangladesh.pptx
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Food chain and Food Web
1.
2.
3. FOOD CHAIN
The sequence of the eaters being eaten is called
food chain
OR
The transfer of food energy from producers,
through a series of organisms
(herbivores to carnivores to decomposers )
with repeated eating and being eaten, is
known as a food chain
6. PRODUCERS
The organisms which carry out photosynthesis constitute
the producers of an ecosystem.
E.g. Plants , algae and bacteria
CONSUMER
Consumers are organisms which eat other organisms.
All animals are consumer.
DECOMPOSERS
The decomposers are organisms that break up
the dead bodies of plants and their waste
products.
The decomposers are fungi and certain
bacteria.
7. FOOD CHAIN
TROPIC LEVEL
The various steps in a food chain is
called TROPIC LEVEL
ENERGY FLOW
The energy is transferred from one
trophic level to another trophic
level is called energy flow.
11. In predator food chain ,one animal capture and devours
another animal .
The animal which is eaten is called PRAY.
Some omnivores and carnivores are also pray to other
animals.
13. The plants and animals of the grazing food chain are
infected by parasites.
The parasites derive their energy form their hosts.
Thus the parasitic chain is formed within the grazing
food chain
FOOD CHAINN IN A GRASS LAND
14. Certain groups of organisms which feed exclusively on the
dead bodies of animals and plants. These organisms are
called DETRITIVOURES.
The detritivoures include algae , bacteria, fungi, protozoan,
insects, millipedes, centipedes ,etc .
Some amount of energy trapped and the reminded is
excreted in the from of simple organic compounds.
15. These are again used by another set of detritivores until
the organic compounds are converted into CO2 and
water.
DEAD ORGANIC MATTER DETRITIVOURES
CO2+ H2O
16. The various food chain are interconnected with each other to form a network
called food web
OR
The interlocking of many food chain is called food web
17. Simple food chain are very rare in nature. This is be cause each
organisms may obtain food from more than one trophic level .
FALLEN LEAVES LIVING LEAVES GRASS SEEDS
SNAILS WOODLICE WORMS RATS MICE SQUIRRELS
HAWK
STARLING OWL
TERTIARY
CONSUMER
SECONDARY
CONSUMER
PRIMARY
CONSUMER
PRODUCER
