Question 1

Which process is responsible for the entry of energy into most ecosystems, and what does NPP stand for?

Accepted Answer

Net Primary Production; it is the amount of energy captured by producers minus the energy used in their own respiration.

Question 2

What is the main difference between photoautotrophs and chemoautotrophs in terms of energy acquisition?

Accepted Answer

Photoautotrophs use sunlight for energy, while chemoautotrophs use chemical energy from inorganic compounds.

Question 3

Which equation correctly represents the process of chemosynthesis found at hydrothermal vents?

Accepted Answer

$$12H_2S + 6CO_2 \rightarrow C_6H_{12}O_6$ + 6H_2O + 12S$$

Question 4

Why are bacteria considered the primary producers in hydrothermal vent communities?

Accepted Answer

They convert inorganic molecules into organic matter through chemosynthesis.

Question 5

Which of the following best describes the role of a keystone species in an ecosystem?

Accepted Answer

A species that has a disproportionately large effect on its environment relative to its abundance.

Question 6

What is the Competitive Exclusion Principle?

Accepted Answer

No two species can occupy the same niche in the same environment for a long time.

Question 7

Which zone of the ocean is characterized by the absence of sunlight and is home to hydrothermal vent communities?

Accepted Answer

Aphotic zone

Question 8

What is the ultimate source of energy for hydrothermal vent communities?

Accepted Answer

Geothermal energy from the Earth's interior

Question 9

Which adaptation allows Riftia pachyptila (giant tubeworms) to survive in hydrothermal vent environments?

Accepted Answer

They house symbiotic bacteria in their trophosome that perform chemosynthesis.

Question 10

Which of the following is NOT a plausible implication of discovering hydrothermal vent communities?

Accepted Answer

All life on Earth depends directly on sunlight.

Question 11

In the context of resource partitioning, what is the likely outcome when two species compete for the same resource?

Accepted Answer

They evolve to use different resources or use the same resource in different ways.

Question 12

Which of the following best explains why deep-sea hydrothermal vent ecosystems were unexpected before their discovery?

Accepted Answer

It was assumed that no light meant no ecosystem could exist.

Question 13

Which of the following is a real-world example of a trophic interaction?

Accepted Answer

A shark eating a fish

Question 14

What is the significance of mid-ocean ridges in the context of hydrothermal vent ecosystems?

Accepted Answer

They are locations where geothermal energy is released, supporting vent communities.

Question 15

Which of the following best describes bioenergetics in the context of ecosystems?

Accepted Answer

The study of how energy flows and is transformed within living systems.

Question 16

Which of the following is a multi-step process that occurs in hydrothermal vent tube worms to obtain energy?

Accepted Answer

Absorption of $$O_2$$, $$CO_2$$, and $$H_2S by $$the plume, followed by chemosynthesis by symbiotic bacteria.

Question 17

Which of the following statements about continental drift is correct?

Accepted Answer

Continental drift has changed the positions of continents over millions of years, affecting oceanic and terrestrial ecosystems.

Question 18

What is the main function of the trophosome in Riftia pachyptila?

Accepted Answer

It houses symbiotic bacteria that perform chemosynthesis.

Question 19

Which of the following is a plausible reason why life might exist on Europa, a moon of Jupiter?

Accepted Answer

Hydrothermal vent-like environments could provide energy for life without sunlight.

Question 20

Which of the following best summarizes the 'Bottom Line' of bioenergetics in ecosystems?

Accepted Answer

If there is even a little energy stored in chemical bonds, life may exploit it.

Ecosystem Energy Flow and Deep-Sea Hydrothermal Vent Communities

Study Guide - Practice Questions