Exam 20: Ecosystem Energetics

The ________ law of thermodynamics states that when energy is transferred or transformed,part of the energy assumes a form that cannot pass on any further.

The ratio of the productivity of one trophic level over what its organisms consume is known as

In most ecosystems,the biomass of carnivores is greater than the biomass of producers.

Low-moisture conditions favor allocation by a plant to

The ratio of energy consumed at the next trophic level over what is produced is known as

For photosynthesis and productivity to occur,a plant must open its ________ to take in carbon dioxide.

Which of the following formulas are correct regarding productivity?

Detrital food chains contain all of the following except

Net primary productivity is generally greatest at

If herbivores eat 1000 kcal of plant energy,approximately how much energy will be converted into the tissues of herbivores?

Which group has the highest production efficiency?

Organic carbon produced within an ecosystem is termed ________.

What level of productivity would one predict with high levels of water supply but low temperatures?

In terrestrial and shallow-water ecosystems,the grazing food chain is dominant over the detrital food chain.

Which factor is the primary control of productivity in aquatic systems?

A(n)________ chemical reaction must absorb energy in order to proceed.

Which of the following has the highest assimilation efficiency?

Consumption efficiency is the ratio of ingestion to production.

In plants,low water availability favors the allocation of energy to the roots.

Net primary productivity is greater in areas with a long photosynthetic period than in areas with a short photosynthetic period.