3. Outline
Introduction to food chain
Types of food chain
Tropic levels in food chain
Introduction to food webs
Ecological pyramids
Types of pyramids
4. Introduction to food chain
FOODCHAIN
A food chain is
the path by
which energy
in the form of
food, passes
from one living
thing to
another within
the ecosystem
5. Types of food chain
Mainly two types of food chain
A] Grazing food chain
B] Detritus food chain
A.Grazing food chain
grass→rabbit→fox→lion
B. Detritus food chain
soil→earth worm→rat→snake→eagle
6. Tropic levels in the food chain
Mainly three tropic levels in food chain
Producers
Consumers
Decomposers
7. Producers
Producers make
their own food.
Green plants use
energy from the
sun to prepare
food.
Producers are on
the bottom of the
food chain.
8. Consumers
Organisms that do not make their own food.
Another term for heterotroph is consumer
because they consume other organisms in order
to live.
9. Mainly three types of consumers
i. Herbivores
ii. Carnivores
iii. Omnivores
13. Decomposers
Microorganisms that are able to break down large
molecules into smaller parts.
Decomposers return the nutrients that are in a
living thing to the soil.
ex. Bacteria
Fungi
14. Introduction to food webs
A number of food
chains form a
interlinking
pattern forming a
web like
arrangement
known as food
web.
15. Ecological pyramids
The pyramidal representation of tropic levels
different organisms based on their ecological
position [producer to final consumer] is called
as an ecological pyramids.
16. Types of pyramids
Mainly three types of pyramids
1) Pyramid of number
2) Pyramid of biomass
3) Pyramid of energy
describes how energy and nutrients move through an ecosystem.
grazing food chain is a type of food chain in which energy at the lowest trophic level is acquired via photosynthesis.
Detritus food chain is the type of food chain that starts with dead organic materials. The dead organic substances are decomposed by microorganisms Decomposers recycle nutrients from dead plant or animal matter back into the soil in terrestrial environments
They use the process of photosynthesis to transform water, sunlight, and carbon dioxide into oxygen,
An herbivore is an organism that mostly feeds on plants. tiny insects
A carnivore is an organism that mostly eats meat, or the flesh of animals. . Sometimes carnivores are called predators
an animal that is naturally able to eat both plants and meat.
organism that breaks down dead organic material; detrivores because they break down the detritus
graphical representation that shows the number of organisms at each trophic level.
A pyramid of biomass is a graphical portrayal of biomass present in a unit of the territory of different trophic levels.
a graphical representation of the energy found within the trophic levels of an ecosystem.
