FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 21: Ecosystem Energetics

Show Answer

Share

---

All types

Filters

Study Flashcards

Question 1

Multiple Choice

Review LaterAdd Note

Review Later

Secondary production is limited primarily by

A) water availability.
B) nutrient availability.
C) primary production.
D) light availability.

E) All of the above
F) C) and D)

Correct Answer

verified

Show Answer

Question 2

Multiple Choice

Review LaterAdd Note

Review Later

According to the first law of thermodynamics,

A) chemical reactions are exothermic.
B) entropy tends to increase.
C) potential energy tends to degrade into an unavailable form.
D) energy is neither created nor destroyed.

E) B) and D)
F) A) and D)

Correct Answer

verified

Show Answer

Question 3

Short Answer

Review LaterAdd Note

In a body of water,the depth at which the availability of light is such that the rate of photosynthesis equals the rate of respiration is called the ________ depth.

Net primary productivity cannot be measured in aquatic ecosystems.

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

Organic carbon produced within an ecosystem is termed ________.

When a chemical reaction results in the loss of energy from the system,the reaction is exothermic.

Brian Silliman's research demonstrated that productivity in highly productive coastal salt marshes is controlled by bottom-up forces,such as physical conditions and nutrient availability.

Relative net primary productivity is the ratio of net primary productivity to standing ________.

Net primary ________ is the energy available to the heterotrophic component of the ecosystem.

In all food chains,the flow of energy is unidirectional from the bottom to the top.

________ efficiency is the ratio of production to assimilation,which measures how efficiently the consumer incorporates assimilated energy into secondary production.

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

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

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

In endotherms,an increase in mass-specific metabolic rate lowers production efficiency.

The heterotrophic component of the ecosystem is often subdivided into two subsystems: consumers and ________.

The second law of thermodynamics is valid only in a closed system,such as a living organism.

Net primary productivity is greater in the open ocean than along the coast.

An ecosystem with inputs of matter and energy is a(n)________ ecosystem.