AP BIOLOGY

Detailed explanation-1: -Nutrient movement is unidirectional in an ecosystem. Because nutrients move in one direction or the other throughout ecosystems from producers to consumers, as in the food chain and carbon cycle, for example. Thus, the above statement is true.

Detailed explanation-2: -Energy is not recycled in ecosystems and each ecosystem requires a continuous input of energy to sustain it. There is some energy transformed at each level of the food chain or food web in an ecosystem. In an ecosystem, energy is frequently transformed from one form to another.

Detailed explanation-3: -The energy flow in the ecosystem is important to maintain an ecological balance. Energy forms chemical compounds, and nutrients are lost as heat. So from above discussion we can conclude that correct answer is option B Nutrients recycle while energy flows in one direction.

Detailed explanation-4: -Continual input of energy, mostly from sunlight, keeps the process going. 3.4 Energy flows through food webs in one direction, from producers to consumers and decomposers. An organism that eats lower on a food chain is more energy efficient than one eating higher on a food chain.

Detailed explanation-5: -In an ecosystem, nutrient transport is unidirectional. Because nutrients migrate from producers to consumers in ecosystems in one direction or the other, as in the food chain.