Question 1

Which of the following best describes an emergent property in biological systems?

Accepted Answer

A characteristic that arises from the interaction of simpler traits, not present in the individual parts alone.

Question 2

Gross Primary Production (GPP) in an ecosystem is best defined as:

Accepted Answer

The total amount of chemical energy produced by primary producers in a given time period.

Question 3

Net Primary Production (NPP) is calculated using which of the following equations?

Accepted Answer

$$\mathrm{NPP} = \mathrm{GPP} - R$$

Question 4

If a forest ecosystem has a GPP of $$2000\ \mathrm{$$kcal/m^2$$/yr}$$ and $$R ($$energy used in cellular respiration) of $$1200\ \mathrm{$$kcal/m^2$$/yr}$$, what is the NPP?

Accepted Answer

$$800\ \mathrm{$$kcal/m^2$$/yr}$$

Question 5

Which of the following statements about energy flow in ecosystems is correct?

Accepted Answer

Energy flows in one direction and is eventually lost as heat.

Question 6

Net Production Efficiency (NPE) is defined as:

Accepted Answer

The ratio of energy stored as new biomass to the total assimilated energy.

Question 7

Which formula correctly represents Net Production Efficiency (NPE)?

Accepted Answer

$$\mathrm{NPE} = \frac{N_P}{AE}$$

Question 8

Which of the following is NOT a requirement for life as discussed in the course materials?

Accepted Answer

Ability to photosynthesize

Question 9

If the Sun were to stop shining, which fundamental process in ecosystems would be disrupted first?

Accepted Answer

Energy input for primary production

Question 10

Which of the following best explains why energy transfer between trophic levels is inefficient?

Accepted Answer

A significant portion of energy is lost as heat during metabolic processes.

Question 11

Which statement about chemical recycling in ecosystems is correct?

Accepted Answer

Chemicals are continuously recycled and reused within ecosystems.

Question 12

Which of the following is an example of unity in biology?

Accepted Answer

Different species sharing traits that indicate a common ancestor.

Question 13

A student claims that energy in ecosystems cycles just like nutrients. Which concept from the course materials best refutes this claim?

Accepted Answer

Energy is lost as heat and flows in one direction, not in a cycle.

Question 14

Which of the following best describes the role of decomposers in an ecosystem?

Accepted Answer

They recycle nutrients by breaking down dead organic matter.

Question 15

Which of the following is true about the relationship between temperature, moisture, and decomposition rates in ecosystems?

Accepted Answer

Decomposition rates increase with increased temperature and moisture.

Question 16

In a grazing food chain, which of the following is the correct order of energy flow?

Accepted Answer

Primary producer → Primary consumer → Secondary consumer

Question 17

Which of the following is a direct consequence of the second law of thermodynamics in biological systems?

Accepted Answer

Some energy is lost as heat during every energy transfer.

Question 18

Which of the following is NOT a characteristic of living organisms as outlined in the course materials?

Accepted Answer

Ability to photosynthesize

Question 19

If only 10% of the energy at one trophic level is transferred to the next, how much energy would be available to secondary consumers if the primary producers capture $$10,000\ \mathrm{kcal} of $$energy?

Accepted Answer

$$100\ \mathrm{kcal}$$

Question 20

Which of the following best explains why only a small percentage of sunlight is stored as chemical energy in ecosystems?

Accepted Answer

Most sunlight is reflected or lost as heat, and only a small fraction is captured by photosynthetic organisms.

General Biology: Foundations, Energy Flow, and Ecosystem Dynamics

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