Revision: 2.2 Energy and Biomass — Part A
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1
What is the main source of energy for most ecosystems?
Sunlight
2
What energy transformation occurs during photosynthesis?
Light energy is transformed into chemical energy stored in organic molecules
3
Name two chemical inputs needed for photosynthesis
Carbon dioxide and water
4
What is the main purpose of cellular respiration?
To release energy from organic molecules and make it available for celluar processes
5
What is a trophic level?
A feeding position ina food chain or food web
6
What do the arrows in a food chain show?
The direction of energy and matter transfer, from the organism eaten to the organism that eats it
7
Why is less energy available at higher trophic levels?
Energy is lost as heat during respiration, and some biomass is not eaten or assimilated
8
If 10 percent of 1000 kJ is transferred to the next trophic level, how much energy is transferred?
100
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