Introduction
The following quote: "Ecosystems require a continuous supply of energy to fuel life processes and to replace energy lost as heat" is it true or false?
True
What is the initial source of energy for all vegetation.
Sunlight
Heat has been converted into a form that the organism can no longer use as a source of .....
renergy
What is Pyramid of energy used for?
Used to show how much and how fast energy flows from one trophic level to the next in a community.
What is a food web?
Is a diagram that shows how food chains are linked together into more complex feeding relationships
What is the importance of sunlight?
Ecosystems rely directly or indirectly on sunlight.
It provides the energy for all life.
What is the definition of food chains?
Sequence showing the feeding relationships and energy flow between species.
How much energy (heat) is lost?
As much as 90%
What are the units used to measure the amount of energy?
Units: kJ m–2 year–1
What do the number of organisms in the chain and the quantity of light available determine about the chain.
The length of the chain
Consumers cannot ‘eat’ ..... and ......, but they can eat ......., ......., and ......
sunlight and air; carbohydrates, proteins, and lipids.
How many trophic levels are there?
4
Once the heat leaves an organism’s body, it cannot...?
be used again as a biological energy resource.
The bottom level will always represent the ......, with subsequent levels representing .......
producers & consumers
True or false: All of the molecules of the food chain can participate in the accumulating biomass.
False
Photosynthetic organisms take inorganic carbon dioxide, CO2, and convert it into...?
energy-rich sugar, C6H12O6
What number of consumer is the Skimmer dragonfly?
Secondary consumer
Once the heat has radiated into the surrounding environment, the ecosystem can take that heat back to use it; true or false?
False
The three main types of ecological pyramids measure species are?
Pyramid of numbers, biomass and energy
The number of organisms in the chain and the quantity of light determinate..?
how long the chain is.
Light energy is absorbed by ......... and is converted into chemical energy via photosynthesis
photoautotrophs
In which animal the cells will convert the energy into water and carbon dioxide?
In the grasshopper
What are the four reasons as to why not all the energy is used in the next trophic level.
Not all of an organism is swallowed.
Not all of the food swallowed can be absorbed.
Some organisms die without having been eaten.
There is a considerable heat loss as a result of cellular respiration.
How many Joules of sunlight are used by the producers in the pyramid of energy.
10,000 J
A food web is more representative of actual feeding pathways within an ecosystem because?
Organisms can have more than one food source
Organisms can have more than one predator