43 terms

7th Grade Science - ENERGY FLOW THRU ECOSYSTEMS

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Photosynthesis
Process by which plants use carbon dioxide, water and light energy in the presence of chlorophyll to make glucose and oxygen
Autotrophs
Organisms which make their own food
Heterotrophs
An organism that obtains food by eating other organisms
Photosynthesis Chemical Equation
6CO2 + 6H20 --> C6H12O6 + 6O2
Beginning Materials/Raw Materials/Reactants of Photosynthesis
Carbon dioxide and Water (+Light Energy)
End Materials/Products of Photosynthesis
Glucose and oxygen (+Water vapor)
Needed in order to help plants absorb the light energy necessary for photosynthesis; a pigment
Chlorophyll
Leaf
General area of a plant where most photosynthesis takes place
Palisade layer
Layer in the leaf where most photosynthesis takes place and food is produced
Chloroplast
Where photosynthesis takes place in the plant cell (at a cellular level)
In the photosynthesis equation, what part is the "food" for plant that is used for growth and plant structure?
Glucose (C6H12O6)
Photosynthesis Simple Equation
Carbon Dioxide + Water + (light/chlorophyll) YIELDS Glucose + Oxygen + (water vapor)
Where does gas exchange occur in a plant?
Stomata
When a stoma is open, what happens?
It takes in raw materials (carbon dioxide, water & light) and turns it into food
These cells act as "gate keepers" at the Stomata, allowing it to open and close
Guard cells
Animals breathe out __________________ which plants in turn absorb.
Carbon Dioxide
Plants absorb Carbon Dioxide and combine it with water, then turn it into _________________ which animals breathe in.
Oxygen
Why do plants need so much water?
Because 90% of the water they take in through their roots is lost through the stoma
Define respiration
the process of breaking down glucose into energy
2 functions of photosynthesis
-directly or indirectly produces food for almost all organisms
-removes CO2 from the atmosphere and adds O2 to the atmosphere
Define composting
The process used to speed up the decay process; a mixture of decaying substances such as dead leaves and manure used to fertilize soil
Any living or once living thing that contains mass is called _______________
Biomass
Examples of biomass
Bacteria, plants, animals
__________________make their own food from sunlight and are eaten by Primary Consumers
Primary Producers
___________________eat the producers
Primary Consumers (plant eaters)
_________________eat primary consumers
Secondary Consumers (plant & animal eaters)
__________________eat secondary consumers
Tertiary consumers (plant & animal eaters)
Give examples of a producer
Grass, trees, shrubs, ferns, algae
Give examples of a insectivore
Frog, anteater, moles, shrew
Give examples of a decomposer
bacteria, fungi, dung beetle, worms
Give examples of a carnivore
large wild cats (lions,tigers), bears, sharks, snakes, crocodiles
Give examples of a herbivore
deer, squirrels, zebra, llama, cows, goat, giraffe
Give examples of an omnivore
humans, bears, pigs, birds, skunks, raccoon
Give examples of a scavenger
buzzards, hyenas, vultures
Living factors that affect an ecosystem such as bacteria, plants and animals would be classified as a ____________factor.
biotic
Non-living factors that affect an ecosystem such as sunlight, water, wind, temperature would be classified as a _____________factor.
abiotic
__________________help an ecosystem by recycling material from dead organisms
decomposers
An example of a desert biome food chain
cactus-->rodent-->snake-->hawk
An example of a coniferous forest biome food chain
grass-->deer-->wolf
An example of a temperate deciduous forest biome food chain
grass-->squirrel-->raccoon
What do we use food/energy pyramids for?
To show how energy is lost at each trophic level
How much energy is lost at each tropic level?
90%
There should be ______ times as many producers as primary consumers in an ecosystem. Why?
10 times; because only 10 percent of energy from one trophic level is passed on to the next (90% is lost at each level)
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