Question

21 multiple choice 2 points
what concept does the diagram above best represent?
the flow of matter through the carbon cycle
the balance of oxygen and carbon dioxide in photosynthesis
the cycling of nutrients through food webs
the loss of energy at each trophic level in an ecosystem

Explanation:

The diagram shows energy percentages (100%, 10%, 1%, 0.1%) at different trophic levels (primary producer, first - level consumer, second - level consumer, third - level consumer) with heat loss at each level. This is characteristic of the 10% energy transfer rule in an ecosystem, where energy is lost at each trophic level.

• The carbon cycle (first option) is about the movement of carbon, not shown here.
• The balance of oxygen and carbon dioxide in photosynthesis (second option) is a chemical reaction aspect, not depicted.
• Nutrient cycling (third option) is about elements like nitrogen, phosphorus etc., not the focus here.

Answer:

The loss of energy at each trophic level in an ecosystem