Environmental Studies ยท Biology

Ecology and Biodiversity

1,739 Questions

Ecology and biodiversity are vital topics in environmental studies, covering ecosystem structures, species diversity, and environmental impacts. These concepts are frequently tested in competitive examinations for civil services and state selections. The questions cover carrying capacity, ecological succession, and conservation fundamentals.

Species richness measurementTypes of ecological diversityBiome distribution factorsCarrying capacity conceptEcosystem servicesEnvironmental Impact Assessment

Ecology and Biodiversity Questions

Multiple choice

What is the role of keystone species in an ecosystem?

  1. Keystone species are species that have a disproportionately large impact on their ecosystem relative to their abundance.

  2. Keystone species are species that are essential for the survival of other species in their ecosystem.

  3. Keystone species are species that are at the top of the food chain in their ecosystem.

  4. Keystone species are species that are found in all ecosystems.
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A Correct answer
Explanation

Keystone species are species that have a disproportionately large impact on their ecosystem relative to their abundance. They play a critical role in maintaining the structure and function of their ecosystem.

Multiple choice

What is the concept of carrying capacity in ecology?

  1. Carrying capacity is the maximum population size of a species that an environment can sustain indefinitely, given the food, water, and other resources available.

  2. Carrying capacity is the maximum population size of a species that an environment can sustain indefinitely, given the amount of pollution that the species produces.

  3. Carrying capacity is the maximum population size of a species that an environment can sustain indefinitely, given the amount of habitat that is available.

  4. Carrying capacity is the maximum population size of a species that an environment can sustain indefinitely, given the number of predators that are present.
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A Correct answer
Explanation

Carrying capacity is the maximum population size of a species that an environment can sustain indefinitely, given the food, water, and other resources available.

Multiple choice

What is the role of decomposers in an ecosystem?

  1. Decomposers are organisms that break down dead organic matter into simpler substances that can be used by other organisms.

  2. Decomposers are organisms that convert organic matter into inorganic matter.

  3. Decomposers are organisms that recycle nutrients back into the environment.

  4. Decomposers are organisms that help to maintain the balance of oxygen and carbon dioxide in the atmosphere.
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A Correct answer
Explanation

Decomposers are organisms that break down dead organic matter into simpler substances that can be used by other organisms.

Multiple choice

What is the term used to describe the dynamic equilibrium that exists in a healthy ecosystem?

  1. Ecological balance

  2. Homeostasis

  3. Carrying capacity

  4. Trophic cascade
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A Correct answer
Explanation

Ecological balance refers to the state of equilibrium in which the populations of different species in an ecosystem are relatively stable and the ecosystem functions properly.

Multiple choice

Which of the following is NOT a key component of a balanced ecosystem?

  1. Producers

  2. Consumers

  3. Decomposers

  4. Abiotic factors
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Abiotic factors are non-living components of an ecosystem, such as temperature, water, and soil, which influence the survival and distribution of organisms, but they are not considered living components of the ecosystem.

Multiple choice

What is the term used to describe the maximum population size of a species that an ecosystem can support?

  1. Ecological balance

  2. Carrying capacity

  3. Population density

  4. Trophic cascade
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carrying capacity is the maximum population size of a species that an ecosystem can support without experiencing degradation or collapse.

Multiple choice

What is the term used to describe the process by which energy flows through an ecosystem?

  1. Energy flow

  2. Trophic levels

  3. Food webs

  4. Ecological pyramids
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A Correct answer
Explanation

Energy flow is the process by which energy is transferred from one organism to another through a food chain or food web.

Multiple choice

Which marine ecosystem is characterized by a high diversity of plant and animal life, often forming intricate food webs?

  1. Coral Reefs

  2. Estuaries

  3. Mangroves

  4. Open Ocean
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A Correct answer
Explanation

Coral reefs are known for their exceptional biodiversity, supporting a wide variety of marine organisms and forming complex food webs.

Multiple choice

Which of the following is NOT a provisioning service provided by ecosystems?

  1. Food

  2. Fiber

  3. Water

  4. Climate regulation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Climate regulation is a regulating service provided by ecosystems, not a provisioning service.

Multiple choice

What is the main factor that determines the amount of food that an ecosystem can produce?

  1. Climate

  2. Soil fertility

  3. Water availability

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All of the above factors play a role in determining the amount of food that an ecosystem can produce.

Multiple choice

What is the term used to describe a group of subpopulations that are connected by occasional migration?

  1. Metapopulation

  2. Population

  3. Community

  4. Ecosystem
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A Correct answer
Explanation

A metapopulation is a group of subpopulations that are connected by occasional migration, allowing for genetic exchange and recolonization of patches.

Multiple choice

What is the term used to describe the variety of life on Earth, including the diversity of species, ecosystems, and genetic variation?

  1. Biodiversity

  2. Ecosystem services

  3. Conservation biology

  4. Sustainable development
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A Correct answer
Explanation

Biodiversity encompasses the variety of life forms on Earth, including the diversity of species, ecosystems, and genetic variation.

Multiple choice

Which of the following is NOT an example of an ecosystem service provided by biodiversity?

  1. Pollination of crops

  2. Water purification

  3. Climate regulation

  4. Food production
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Food production is not directly an ecosystem service provided by biodiversity, although biodiversity can contribute to food security through the provision of genetic resources for agriculture.

Multiple choice

What are supporting services in the context of ecosystem services?

  1. Services that directly benefit human well-being

  2. Services that indirectly benefit human well-being

  3. Services that are essential for the functioning of ecosystems

  4. Services that are provided by humans to ecosystems
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Supporting services are ecosystem services that indirectly benefit human well-being by supporting the production of other ecosystem services, such as provisioning, regulating, and cultural services.

Multiple choice

What is functional diversity?

  1. The variety of traits and functions performed by organisms in an ecosystem.

  2. The number of different species in an ecosystem.

  3. The genetic diversity within a population.

  4. The physical structure of an ecosystem.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Functional diversity refers to the variety of roles and functions that different species play in an ecosystem, such as pollination, seed dispersal, and nutrient cycling.