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Species Diversity and Ecosystem Functioning: Primary Production

Description: This quiz assesses your understanding of the relationship between species diversity and ecosystem functioning, with a focus on primary production.
Number of Questions: 15
Created by:
Tags: biodiversity ecosystem functioning primary production
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What is the term used to describe the total amount of organic matter produced by plants in an ecosystem?

  1. Primary production

  2. Secondary production

  3. Tertiary production

  4. Net primary production


Correct Option: A
Explanation:

Primary production refers to the total amount of organic matter produced by plants through photosynthesis.

Which of the following factors is NOT considered a driver of primary production?

  1. Light intensity

  2. Temperature

  3. Water availability

  4. Species diversity


Correct Option: D
Explanation:

While light intensity, temperature, and water availability are all important drivers of primary production, species diversity is not directly a driver but can influence it through various mechanisms.

According to the Resource-Competition Hypothesis, how does species diversity affect primary production?

  1. Increased diversity leads to increased competition and decreased production

  2. Increased diversity leads to increased competition and increased production

  3. Increased diversity leads to decreased competition and increased production

  4. Increased diversity leads to decreased competition and decreased production


Correct Option: B
Explanation:

The Resource-Competition Hypothesis suggests that increased species diversity leads to increased competition for resources, which in turn stimulates plants to increase their growth and productivity.

Which of the following is an example of a sampling effect on primary production?

  1. Increased species richness leads to increased productivity

  2. Different species use different resources more efficiently

  3. Species interactions, such as competition and facilitation, influence productivity

  4. Random fluctuations in environmental conditions affect productivity


Correct Option: D
Explanation:

Sampling effects are caused by random fluctuations in environmental conditions, such as weather events, which can affect primary production.

How does functional diversity, which considers the different traits and functions of species, influence primary production?

  1. It has no effect on primary production

  2. It increases primary production by increasing resource use efficiency

  3. It decreases primary production by increasing competition

  4. It decreases primary production by reducing resource availability


Correct Option: B
Explanation:

Functional diversity can increase primary production by allowing different species to use resources more efficiently, reducing competition and increasing overall productivity.

Which of the following is an example of a positive species interaction that can enhance primary production?

  1. Competition for resources

  2. Herbivory

  3. Facilitation

  4. Predation


Correct Option: C
Explanation:

Facilitation is a positive species interaction where one species provides a benefit to another, such as providing shade or nutrients, which can lead to increased primary production.

What is the term used to describe the process by which plants convert light energy into chemical energy?

  1. Photosynthesis

  2. Cellular respiration

  3. Glycolysis

  4. Krebs cycle


Correct Option: A
Explanation:

Photosynthesis is the process by which plants use light energy to convert carbon dioxide and water into glucose and oxygen.

Which of the following is NOT a factor that can limit primary production in aquatic ecosystems?

  1. Light availability

  2. Nutrient availability

  3. Temperature

  4. Oxygen concentration


Correct Option: D
Explanation:

Oxygen concentration is not typically a limiting factor for primary production in aquatic ecosystems, as most aquatic plants can obtain oxygen from the water.

How does biodiversity loss affect primary production?

  1. It has no effect

  2. It increases primary production

  3. It decreases primary production

  4. It can have both positive and negative effects


Correct Option: D
Explanation:

Biodiversity loss can have both positive and negative effects on primary production, depending on the specific ecosystem and the species involved.

Which of the following is an example of a negative species interaction that can reduce primary production?

  1. Competition for resources

  2. Herbivory

  3. Facilitation

  4. Predation


Correct Option: B
Explanation:

Herbivory is a negative species interaction where one species (the herbivore) consumes part of another species (the plant), which can reduce the plant's ability to produce biomass.

What is the term used to describe the total amount of organic matter produced by plants in an ecosystem per unit area?

  1. Primary production

  2. Secondary production

  3. Tertiary production

  4. Net primary production


Correct Option: D
Explanation:

Net primary production refers to the total amount of organic matter produced by plants in an ecosystem per unit area, after accounting for the organic matter used by the plants for respiration.

Which of the following is NOT a type of primary production?

  1. Gross primary production

  2. Net primary production

  3. Secondary production

  4. Tertiary production


Correct Option: C
Explanation:

Secondary production refers to the production of organic matter by consumers, such as animals, and is not a type of primary production.

How does species richness, which refers to the number of different species in an ecosystem, influence primary production?

  1. It has no effect

  2. It increases primary production

  3. It decreases primary production

  4. It can have both positive and negative effects


Correct Option: D
Explanation:

Species richness can have both positive and negative effects on primary production, depending on the specific ecosystem and the species involved.

Which of the following is an example of a positive feedback loop between species diversity and primary production?

  1. Increased diversity leads to decreased competition and decreased production

  2. Increased diversity leads to increased competition and increased production

  3. Increased diversity leads to decreased competition and increased production

  4. Increased diversity leads to increased competition and decreased production


Correct Option: B
Explanation:

A positive feedback loop occurs when an increase in one factor leads to an increase in another factor, which in turn leads to a further increase in the first factor. In this case, increased diversity leads to increased competition, which stimulates plants to increase their growth and productivity, leading to increased primary production.

How does nitrogen deposition, which is the addition of nitrogen compounds to the environment from human activities, affect primary production?

  1. It has no effect

  2. It increases primary production

  3. It decreases primary production

  4. It can have both positive and negative effects


Correct Option: D
Explanation:

Nitrogen deposition can have both positive and negative effects on primary production, depending on the specific ecosystem and the amount of nitrogen added.

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