Question

which of the following best describes the movement of energy in an ecosystem? a energy is constantly recycled by decomposers for use by producers. b energy is harnessed by producers, and available energy decreases with each trophic level transfer. c energy is absorbed by plants through water and soil and then moves up the food chain through consumers. d energy is magnified as it moves up the trophic levels, and tertiary consumers store the most energy in a food web.

Explanation:

Producers (like plants) capture energy from sunlight via photosynthesis. As energy moves through trophic levels (from producers to primary, secondary, and tertiary consumers), about 90% of the energy is lost as heat at each transfer according to the 10 - percent rule. Decomposers break down organic matter but do not recycle energy in the sense described in option A. Plants get energy from sunlight, not from water and soil in terms of energy source as stated in option C. Energy decreases, not magnifies, as it moves up trophic levels as in option D.

Answer:

B. Energy is harnessed by producers, and available energy decreases with each trophic level transfer.