food chain &food web

1. 1
Prayer

2. I know that you have an idea with
regards on how the energy flow
through an ecosystem and
maintain its stability.
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3. 3copyright cmassengale

4. 4
Energy Flow in
an Ecosystem
(Food Chains, Food Webs,(Food Chains, Food Webs,
Energy Pyramids)Energy Pyramids)
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5. What is the source of energy
for almost all ecosystem?
•SUNSUN
•PhotosynthesisPhotosynthesis
•Chemical reaction whereChemical reaction where
green plants use water &green plants use water &
carbon dioxide to store thecarbon dioxide to store the
sun’s energy in glucosesun’s energy in glucose
•ENERGY is stored in glucoseENERGY is stored in glucose
•Glucose is stored as starch inGlucose is stored as starch in
plantsplants
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6. Trophic Levels
 Organisms that canOrganisms that can
make glucose duringmake glucose during
photosynthesis arephotosynthesis are
calledcalled PRODUCERS
 Producers use mostProducers use most
of the energy theyof the energy they
make formake for
themselves.themselves.
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 Producers useProducers use
cellularcellular
respiration torespiration to
supply thesupply the
energy they needenergy they need
to live.to live.
 CELLULARCELLULAR
RESPIRATION isRESPIRATION is
the chemicalthe chemical
reaction thatreaction that
releases thereleases the
energy inenergy in
glucose.glucose.

7.  The energy that isThe energy that is
not used bynot used by
producers can beproducers can be
passed on topassed on to
organisms thatorganisms that
cannot make theircannot make their
own energyown energy
 Organisms thatOrganisms that
cannot make theircannot make their
own energy areown energy are
called CONSUMERS.called CONSUMERS.
Consumers that eatConsumers that eat
producers to getproducers to get
energy:energy:
•Are first order (1st
)
or primary consumers
•Are herbivores
(plant-eaters)
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8.  MostMost of theof the
energy the primaryenergy the primary
consumer getsconsumer gets
from the producerfrom the producer
is used by theis used by the
consumer.consumer.
 SomeSome of theof the
energy moves intoenergy moves into
the atmosphere asthe atmosphere as
heatheat
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9. 9
Some energy in theSome energy in the
primary consumer isprimary consumer is
STOREDSTORED && not lostnot lost
to the atmosphere orto the atmosphere or
used by theused by the
consumer itself.consumer itself.
This energy isThis energy is
availableavailable for anotherfor another
consumerconsumer (predator).(predator).copyright cmassengale

10. 10
A Consumer that Eats AnotherA Consumer that Eats Another
Consumer for Energy:Consumer for Energy:
•Is called a secondary orIs called a secondary or
2nd order consumer2nd order consumer
•May be a carnivore or aMay be a carnivore or a
omnivoreomnivore
•May be a predatorMay be a predator
•May be a scavengerMay be a scavenger
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11. 11
Consumers that eatConsumers that eat
other dead consumersother dead consumers
are calledare called scavengersscavengers
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12. 12
MostMost of theof the
energy theenergy the
secondarysecondary
consumer getsconsumer gets
from the primaryfrom the primary
consumer is usedconsumer is used
by the secondaryby the secondary
consumer.consumer.
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13. 13
SomeSome of theof the
energy is lost asenergy is lost as
heat, but someheat, but some
energy is storedenergy is stored
and can passedand can passed
on to anotheron to another
consumer.consumer.
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14. 14
A consumer that eats aA consumer that eats a
consumer that already ate aconsumer that already ate a
consumer:consumer:
•Is called a 3rd orderIs called a 3rd order
or tertiary consumeror tertiary consumer
•May be a carnivore orMay be a carnivore or
a omnivorea omnivore
•May be a predatorMay be a predator
•May be a scavengerMay be a scavenger
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15. 15
Food Chains Show Available EnergyFood Chains Show Available Energy
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16. 16
Another way ofAnother way of
showing theshowing the
transfer oftransfer of
energy in anenergy in an
ecosystem isecosystem is
thethe
ENERGYENERGY
PYRAMIDPYRAMID
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17. 17
Energy Pyramids ShowEnergy Pyramids Show
•The producer has theThe producer has the
greater amount ofgreater amount of
energy.energy.
•At the consumersAt the consumers
level, only 10% oflevel, only 10% of
absorbed nutrient areabsorbed nutrient are
used to make bodyused to make body
tissue.tissue.
•The rest of energyThe rest of energy
lost as heat.lost as heat.
•The amount of usableThe amount of usable
energy per unit massenergy per unit mass
decreases as thedecreases as the
feeding level increases.feeding level increases.
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18. 18
Food WebsFood Webs
•Are interconnectedAre interconnected
food chainsfood chains
•They show theThey show the
feeding relationshipsfeeding relationships
in an ecosystemin an ecosystem
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19. Application
As a student, how can you integrate
your learning in your community as one
ecosystem in maintaining normal
energy flow in every living component
for their growth and survival?
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20. Evaluation
1.Organism that break down organic waste
and remains of organisms
2.Production of organic matter in the
absence of light
3.Interconnecting food chains
4.Units of energy nutrients taken in by the
body
5.Organisms that eat plants only
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Decomposers food webs chemosynthesis
Calories herbivores food chain

21. Are the vegetarian that get all
their energy from the plants? Do
they follow the 10% law of
available energy? Explain your
answer.
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22. References
• Dynamic Science (pp. 359-363)
• Science and Technology of the Modern World (pp. 97-99)
• http://kids.britannica.com/comptons/art-90132/The-
amount-of-energy-at-each-trophic-level-decreases-
asfeb20,2017
• https://www.slideshare.net/quinndaily/food-chains-food-
webs-1767191feb24,2017
• https://sciencebob.com/what-is-the-difference-between-
food-chain-and-a-food-web/feb24,2017
• http://www.dictionary.com/browse/food-chainfeb24,2017
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23. copyright cmassengale 23