Question 1

David Tilman's experiments showed that plots with more species are _______ productive.

Accepted Answer

The answer of David Tilman's experiments showed that plots with...

Question 2

Which of the following statements about the relationship between species richness and productivity in ecological communities is true?

Accepted Answer

The relationship between species richness and productivity in ecological communities is often described by the hump-shaped pattern known as the productivity-diversity relationship. This pattern shows that species richness is highest at intermediate levels of productivity, rather than at the highest or lowest levels. There are several proposed explanations for this pattern, including the idea that moderate levels of disturbance create a balance between competition and resource availability, allowing for the coexistence of a greater number of species.

Question 3

Suppose there are 50 fish species in one lake and 30 in a neighboring lake. If the Sorenson's index of these lakes is 0.4, then _______ species would be shared by the two lakes.

Accepted Answer

The answer of Suppose there are 50 fish species in...

Question 4

To quantify _______ diversity (diversity within a single community), biologists often use the _______ diversity index, which takes into account relative abundance as well as number of species.

Accepted Answer

The answer of To quantify _______ diversity (diversity within a...

Question 5

In which of the following ecosystems would you expect to observe the lowest biomass of primary consumers relative to the biomass of the primary producers?

Accepted Answer

The answer of In which of the following ecosystems would...

Question 6

Use the following to answer questions :
Refer to the food web below to answer the questions that follow. 
-Organism 9 is a(n)

Accepted Answer

The answer of Use the following to answer questions :
Refer...

Question 7

Despite being so low in abundance that it is classified as a "near threatened" species, the jaguar plays an important role in structuring forest communities. It is thus considered a _______ species.

Accepted Answer

The answer of Despite being so low in abundance that...

Question 8

Which of the following statements regarding species diversity is false?

Accepted Answer

Sorenson's index is actually used to estimate the similarity between two communities or habitats, not their alpha diversity.

Question 9

A plant in the dark uses 0.02 ml of O₂ per minute. The same plant in sunlight releases 0.14 ml of O₂ per minute. Its rate of gross primary production would be approximately _______ ml of O₂ per minute.

Accepted Answer

The rate of gross primary production is the total amount of oxygen produced by photosynthesis. In the dark, the plant uses 0.02 ml of O2 per minute for respiration. In sunlight, it releases 0.14 ml of O2 per minute, which is the net production. Therefore, the gross production is the net production plus the oxygen used in respiration: 0.14 + 0.02 = 0.16 ml of O2 per minute.

Question 10

Gravel deposits formed where glacial fronts have remained stationary for many years are known as _______.

Accepted Answer

The answer of Gravel deposits formed where glacial fronts have...

Question 11

Which of the following statements about keystone species is true?

Accepted Answer

Keystone species are those whose removal has a significant impact on the entire community structure. They may not be very abundant or practice herbivory, and their dispersion patterns can vary. Therefore, only option B accurately describes a key characteristic of keystone species.

Question 12

Succession is affected both by facilitation and by its opposite, _______.

Accepted Answer

The answer of Succession is affected both by facilitation and...

Question 13

The theory of _______ biogeography was developed to explain _______ relationships.

Accepted Answer

The answer of The theory of _______ biogeography was developed...

Question 14

A freak cold spell in October 2009 in the northeastern United States dramatically reduced the survival of several small mammal species. In this regard, the cold spell was acting as a _______.

Accepted Answer

The answer of A freak cold spell in October 2009...

Question 15

Suppose the productivity of several test plots is artificially increased by adding fertilizer to the soil. On the graph below, draw the expected relationship between productivity and species diversity on these test plots.

Accepted Answer

The answer of Suppose the productivity of several test plots...

Question 16

Use the following to answer questions :
Refer to the food web below to answer the questions that follow. 
-The food web has _______ trophic levels.

Accepted Answer

The food web has four trophic levels, starting with the producers (plants) at the first level, the primary consumers (herbivores) at the second level, the secondary consumers (carnivores) at the third level, and the tertiary consumers (top carnivores) at the fourth level.

Question 17

The ecological community of a pond comprises

Accepted Answer

An ecological community consists of all the species living in a particular area, interacting with each other, but does not include the abiotic environment.

Question 18

One reason that agricultural communities are often unstable is the practice of _______, the planting of only a single species.

Accepted Answer

The answer of One reason that agricultural communities are often...

Question 19

The species composition of grasses changes little across communities in a grassland biome; thus, the _______ diversity of grasses for this region is _______.

Accepted Answer

The answer of The species composition of grasses changes little...

Question 20

If the net primary productivity of a community is 2,000 kcal/m²/yr, what would be the best estimate of the productivity (in kcal/m²/yr) of the secondary consumers in that community?

Accepted Answer

In ecological energy transfer, only about 10% of energy is passed from one trophic level to the next. If the net primary productivity is 2,000 kcal/m²/yr, the primary consumers would receive about 200 kcal/m²/yr, and the secondary consumers would receive about 20 kcal/m²/yr.

Quiz 57: Community Ecology

David Tilman's experiments showed that plots with more species are _______ productive.

Which of the following statements about the relationship between species richness and productivity in ecological communities is true?

Suppose there are 50 fish species in one lake and 30 in a neighboring lake. If the Sorenson's index of these lakes is 0.4, then _______ species would be shared by the two lakes.

To quantify _ diversity (diversity within a single community), biologists often use the _ diversity index, which takes into account relative abundance as well as number of species.

In which of the following ecosystems would you expect to observe the lowest biomass of primary consumers relative to the biomass of the primary producers?

Use the following to answer questions : Refer to the food web below to answer the questions that follow. -Organism 9 is a(n)

Despite being so low in abundance that it is classified as a "near threatened" species, the jaguar plays an important role in structuring forest communities. It is thus considered a _______ species.

Which of the following statements regarding species diversity is false?

A plant in the dark uses 0.02 ml of O₂ per minute. The same plant in sunlight releases 0.14 ml of O₂ per minute. Its rate of gross primary production would be approximately _______ ml of O₂ per minute.

Gravel deposits formed where glacial fronts have remained stationary for many years are known as _______.

Which of the following statements about keystone species is true?

Succession is affected both by facilitation and by its opposite, _______.

The theory of _ biogeography was developed to explain _ relationships.

A freak cold spell in October 2009 in the northeastern United States dramatically reduced the survival of several small mammal species. In this regard, the cold spell was acting as a _______.

Suppose the productivity of several test plots is artificially increased by adding fertilizer to the soil. On the graph below, draw the expected relationship between productivity and species diversity on these test plots.

Use the following to answer questions : Refer to the food web below to answer the questions that follow. -The food web has _______ trophic levels.

The ecological community of a pond comprises

One reason that agricultural communities are often unstable is the practice of _______, the planting of only a single species.

The species composition of grasses changes little across communities in a grassland biome; thus, the _ diversity of grasses for this region is _.

If the net primary productivity of a community is 2,000 kcal/m²/yr, what would be the best estimate of the productivity (in kcal/m²/yr) of the secondary consumers in that community?

Quiz 57: Community Ecology

David Tilman's experiments showed that plots with more species are _______ productive.

Which of the following statements about the relationship between species richness and productivity in ecological communities is true?

Suppose there are 50 fish species in one lake and 30 in a neighboring lake. If the Sorenson's index of these lakes is 0.4, then _______ species would be shared by the two lakes.

To quantify _______ diversity (diversity within a single community), biologists often use the _______ diversity index, which takes into account relative abundance as well as number of species.

In which of the following ecosystems would you expect to observe the lowest biomass of primary consumers relative to the biomass of the primary producers?

Use the following to answer questions : Refer to the food web below to answer the questions that follow. -Organism 9 is a(n)

Despite being so low in abundance that it is classified as a "near threatened" species, the jaguar plays an important role in structuring forest communities. It is thus considered a _______ species.

Which of the following statements regarding species diversity is false?

A plant in the dark uses 0.02 ml of O2 per minute. The same plant in sunlight releases 0.14 ml of O2 per minute. Its rate of gross primary production would be approximately _______ ml of O2 per minute.

Gravel deposits formed where glacial fronts have remained stationary for many years are known as _______.

Which of the following statements about keystone species is true?

Succession is affected both by facilitation and by its opposite, _______.

The theory of _______ biogeography was developed to explain _______ relationships.

A freak cold spell in October 2009 in the northeastern United States dramatically reduced the survival of several small mammal species. In this regard, the cold spell was acting as a _______.

Suppose the productivity of several test plots is artificially increased by adding fertilizer to the soil. On the graph below, draw the expected relationship between productivity and species diversity on these test plots.

Use the following to answer questions : Refer to the food web below to answer the questions that follow. -The food web has _______ trophic levels.

The ecological community of a pond comprises

One reason that agricultural communities are often unstable is the practice of _______, the planting of only a single species.

The species composition of grasses changes little across communities in a grassland biome; thus, the _______ diversity of grasses for this region is _______.

If the net primary productivity of a community is 2,000 kcal/m2/yr, what would be the best estimate of the productivity (in kcal/m2/yr) of the secondary consumers in that community?

To quantify _ diversity (diversity within a single community), biologists often use the _ diversity index, which takes into account relative abundance as well as number of species.

A plant in the dark uses 0.02 ml of O₂ per minute. The same plant in sunlight releases 0.14 ml of O₂ per minute. Its rate of gross primary production would be approximately _______ ml of O₂ per minute.

The theory of _ biogeography was developed to explain _ relationships.

The species composition of grasses changes little across communities in a grassland biome; thus, the _ diversity of grasses for this region is _.

If the net primary productivity of a community is 2,000 kcal/m²/yr, what would be the best estimate of the productivity (in kcal/m²/yr) of the secondary consumers in that community?