C4.2.2—Sunlight as principal energy source question 1
Compounds of carbon, hydrogen and oxygen are used to supply and store energy.
Explain how the energy supply in an ecosystem is dependent on sunlight.
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Compounds of carbon, hydrogen and oxygen are used to supply and store energy.
Explain how the energy supply in an ecosystem is dependent on sunlight.
a. plants/autotrophs use sunlight in photosynthesis;
b. light energy is captured by chloroplasts/chlorophyll;
c. converting light energy to chemical energy;
d. this converts inorganic molecules into organic molecules;
e. plants (other photosynthetic organisms) are producers;
f. plants/producers are eaten by primary consumers/animals/heterotrophs;
g. energy transfers through a food chain/web/trophic levels;
h. at each stage of the food chain/web/trophic levels energy is lost (as heat/respiration);
i. about 10 % of the energy reaches the next trophic level;
j. energy flow being linear/one-direction/not cyclic;
d. Accept word equation or chemical equation for photosynthesis.
f. Can be shown in a labelled drawing.
7 max