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Biodiversity Quiz 7 (10 MCQs)

This set of multiple-choice questions evaluates knowledge in conservation biology, focusing on biodiversity and species assessment. It covers concepts such as the IUCN Red List, biodiversity conservation, habitat destruction, invasive species, and ecosystem services. The questions test understanding of species classification, biodiversity threats, and the impact of human activities on ecosystems.

Quiz Instructions

Select an option to see the correct answer instantly.

1. A group of living things that have similar genes capable of reproducing

Correct Answer: Correct answer is: (E) Species.

Exam Relevance: AP Biology, IB Biology, MCAT, GRE Biology

Difficulty: Easy

Concept notes: A species is a group of living organisms that share similar genetic traits and can interbreed to produce fertile offspring.

Common Mistakes: A common misunderstanding is confusing a population with a species. While a population is a group of organisms of the same species living in the same area, a species is a broader classification that includes all organisms capable of interbreeding.

Explanations: A species is defined as a group of living things that have similar genes and are capable of reproducing with each other to produce fertile offspring. This matches the description given in the question.

Option Analysis:

Option A: Biosphere refers to the global sum of all ecosystems and is not a group of living things with similar genes.
Option B: Natural habitat is the natural environment where a species lives, not a group of living things with similar genes.
Option C: Extinction refers to the end of a species, not a group of living things with similar genes.
Option D: Population is a group of organisms of the same species living in the same area, but it does not encompass all individuals capable of interbreeding.
Option E: Species is the correct answer as it refers to a group of living things with similar genes capable of reproducing.

2. How many species are estimated to be living on Earth?

Correct Answer: Correct answer is: (D) Between 10 and 50 million.

Exam Relevance: AP Environmental Science, GRE Biology, MCAT

Difficulty: Moderate

Concept notes: The estimated number of species on Earth is a subject of ongoing research and debate within the field of biodiversity. Estimates range widely due to the vast number of undiscovered species, particularly in less explored ecosystems like the deep sea and tropical rainforests.

Common Mistakes: A common misunderstanding is that the exact number of species is known, when in fact, it is an estimate based on current scientific understanding and extrapolation.

Explanations: The estimate of between 10 and 50 million species is widely accepted in the scientific community. This range accounts for the vast diversity of life on Earth, including both known and unknown species. The lower end of the range (10 million) is based on more conservative estimates, while the upper end (50 million) includes more speculative estimates that consider the potential for undiscovered species in less explored environments.

Option Analysis:

Option A: This range is too low and does not account for the vast diversity of life on Earth.
Option B: This range is also too low and does not reflect the current scientific consensus on the number of species.
Option C: This range is still too low and does not capture the full extent of biodiversity.
Option D: This range is the most accurate and widely accepted estimate in the scientific community.

3. What factor does NOT affect biodiversity?

Correct Answer: Correct answer is: (B) Planting Native Plants.

Exam Relevance: AP Environmental Science, IB Environmental Systems and Societies, GRE Biology

Difficulty: Easy

Concept notes: Biodiversity is influenced by factors that disrupt or alter natural ecosystems. Planting native plants generally supports and enhances local biodiversity by providing suitable habitats and food sources for native species.

Common Mistakes: A common misunderstanding is that all human activities negatively impact biodiversity. However, certain activities like planting native plants can actually benefit biodiversity.

Explanations: Planting native plants does not negatively affect biodiversity; rather, it supports and enhances it. Native plants are adapted to the local environment and provide essential resources for native species, thereby promoting biodiversity.

Option Analysis:

Option A: Urbanization reduces biodiversity by destroying natural habitats and introducing non-native species.
Option B: Planting native plants supports biodiversity by providing suitable habitats and food sources for native species.
Option C: Overfishing reduces biodiversity by depleting fish populations and disrupting marine ecosystems.
Option D: Pollution negatively affects biodiversity by contaminating habitats and harming species.

4. What percent of terrestrial animals depend on forest habitats?

Correct Answer: Correct answer is: (C) 80.

Exam Relevance: AP Environmental Science, GRE Biology, MCAT

Difficulty: Moderate

Concept notes: Forests are crucial habitats for a significant portion of terrestrial animal species. They provide essential resources such as food, shelter, and breeding grounds.

Common Mistakes: A common misunderstanding is that all terrestrial animals depend equally on all types of habitats, when in fact, forests are particularly important for a large percentage of species.

Explanations: Forests are vital ecosystems that support a diverse range of terrestrial animals. They offer a complex structure with multiple layers, including canopy, understory, and forest floor, which provide various niches for different species. This habitat diversity supports a high percentage of terrestrial animal species, making forests critical for biodiversity. Studies and ecological assessments indicate that approximately 80% of terrestrial animals depend on forest habitats.

Option Analysis:

Option A: 60 is not the correct percentage of terrestrial animals that depend on forest habitats.
Option B: 75 is not the correct percentage of terrestrial animals that depend on forest habitats.
Option C: 80 is the correct percentage of terrestrial animals that depend on forest habitats.
Option D: 85 is not the correct percentage of terrestrial animals that depend on forest habitats.

5. What word do we use to describe a species which has no members still living?

Correct Answer: Correct answer is: (B) Extinct.

Exam Relevance: AP Environmental Science, IB Biology, GRE Biology

Difficulty: Easy

Concept notes: In biodiversity, a species that has no living members is described as extinct.

Common Mistakes: A common misunderstanding is that "endangered" means a species has no living members, but it actually means the species is at risk of becoming extinct.

Explanations: The term "extinct" is used to describe a species that has no living members. This means that all individuals of that species have died out and there are no more living representatives of the species. The term "endangered" refers to species that are at risk of becoming extinct but still have living members.

Option Analysis:

Option A: Endangered refers to species that are at risk of becoming extinct but still have living members. This is not the correct term for a species with no living members.
Option B: Extinct refers to a species that has no living members. This is the correct term for a species with no living members.

6. A place that stores seeds to preserve their genes for the future is called .....

Correct Answer: Correct answer is: (C) Seed bank.

Exam Relevance: GRE, MCAT, AP Environmental Science, Botany Exams

Difficulty: Moderate

Concept notes: A seed bank is a facility that stores seeds to preserve plant genetic diversity for future use.

Common Mistakes: A common misunderstanding is confusing a seed bank with other types of plant repositories, such as botanical preserves or herbaria, which have different primary functions.

Explanations: A seed bank is specifically designed to store seeds for long-term preservation, ensuring that genetic material from various plant species is conserved. This is crucial for biodiversity conservation and future agricultural needs. Other options like botanical preserves, plant depositories, and herbaria serve different purposes, such as living plant collections, general plant storage, and dried plant specimens, respectively.

Option Analysis:

Option A: A botanical preserve is a protected area for living plants, not a storage facility for seeds.
Option B: A plant depository can refer to a general storage facility for plants, but it is not specifically designed for seed preservation.
Option C: A seed bank is the correct term for a facility that stores seeds to preserve genetic diversity.
Option D: A herbarium is a collection of dried plant specimens, not a seed storage facility.

7. Coal is the largest source of electricity worldwide. What can be an environmental impact of the surface mining of coal?

Correct Answer: Correct answer is: (A) Loss of habitats and biodiversity.

Exam Relevance: AP Environmental Science, GRE Subject Test in Ecology, Environmental Management Exams

Difficulty: Moderate

Concept notes: Surface mining of coal can lead to significant environmental impacts, particularly on habitats and biodiversity.

Common Mistakes: A common misunderstanding is that greenhouse gas emissions are the primary environmental impact of coal mining, but the loss of habitats and biodiversity is a direct and significant consequence of surface mining.

Explanations: Surface mining, also known as strip mining, involves the removal of soil and rock to access coal deposits. This process can lead to the destruction of natural habitats, loss of vegetation, and disruption of ecosystems. The removal of topsoil and vegetation can result in the displacement or extinction of local flora and fauna, thereby reducing biodiversity in the affected areas.

Option Analysis:

Option A: Correct. Surface mining can lead to the destruction of habitats and loss of biodiversity.
Option B: Incorrect. While greenhouse gas emissions are a significant concern, they are not the primary environmental impact of surface mining.
Option C: Incorrect. Radioactive contamination is not a primary concern associated with surface mining of coal.
Option D: Incorrect. Contamination of groundwater is a potential issue, but it is not the primary environmental impact related to loss of habitats and biodiversity.

8. It can lead to the extinction of native plants and animals, destroy biodiversity, and permanently alter habitats.

Correct Answer: Correct answer is: (B) INVASIVE.

Exam Relevance: AP Environmental Science, GRE Biology, MCAT

Difficulty: Moderate

Concept notes: Invasive species are non-native organisms that can cause significant harm to the environment, economy, and human health. They often outcompete native species for resources, leading to a decline in biodiversity and the potential extinction of native plants and animals.

Common Mistakes: A common misunderstanding is that all non-native species are invasive. However, not all non-native species cause harm; some can coexist without significant negative impacts.

Explanations: Invasive species are non-native organisms that can outcompete and displace native species, leading to a loss of biodiversity. They can alter habitats, disrupt ecosystems, and cause the extinction of native plants and animals. This makes invasive species a significant threat to biodiversity.

Option Analysis:

Option A: "EXVASIVE" is not a correct term and does not exist in the context of biodiversity.
Option B: "INVASIVE" correctly describes non-native species that can cause significant harm to the environment and biodiversity.
Option C: "NATIVE" refers to species that naturally occur in a specific area and do not cause the described negative impacts.
Option D: "FOREIGN" is a general term for non-native species but does not specifically imply the harmful impacts described.

Mnemonic: INVASIVE: Invaders Not Valued, Always Spread, Invade, and Vanquish Ecosystems.

9. How does the loss of wetlands contribute to the decline of biodiversity?

Correct Answer: Correct answer is: (A) By reducing habitat for wildlife.

Exam Relevance: AP Environmental Science, GRE Biology, MCAT

Difficulty: Moderate

Concept notes: Wetlands are crucial ecosystems that provide habitat for a wide variety of species. The loss of these habitats directly impacts the biodiversity of the area.

Common Mistakes: A common misunderstanding is that wetlands primarily contribute to biodiversity through water purification or carbon sequestration, rather than by providing habitat.

Explanations: Wetlands serve as critical habitats for numerous species of plants and animals. When wetlands are lost, the habitat for these species is reduced, leading to a decline in biodiversity. This is because many species depend on the unique conditions provided by wetlands for their survival, including food sources, breeding grounds, and shelter.

Option Analysis:

Option A: Correct. Wetlands provide essential habitats for many species, and their loss directly reduces biodiversity.
Option B: Incorrect. While wetlands do sequester carbon, this does not directly explain the decline in biodiversity.
Option C: Incorrect. Wetlands are not typically associated with promoting sustainable agriculture.
Option D: Incorrect. Although wetlands can enhance water quality, this does not directly relate to the decline in biodiversity.

Mnemonic: Habitat Loss = Biodiversity Drop

10. List of endangered species was released by

Correct Answer: Correct answer is: (A) IUCN.

Exam Relevance: GRE, MCAT, AP Environmental Science, Conservation Biology Exams

Difficulty: Easy

Concept notes: The International Union for Conservation of Nature (IUCN) is responsible for releasing the Red List, which is a comprehensive inventory of the global conservation status of biological species.

Common Mistakes: A common mistake is to confuse the IUCN with other organizations that may also work on conservation efforts but do not specifically release the list of endangered species.

Explanations: The IUCN is the primary organization responsible for assessing the conservation status of species and releasing the Red List, which includes the list of endangered species. This list is widely recognized and used by conservationists, researchers, and policymakers.

Option Analysis:

Option A: Correct. The IUCN is the organization responsible for releasing the list of endangered species.
Option B: Incorrect. BBC is a broadcasting company and does not release lists of endangered species.
Option C: Incorrect. WCC is not a recognized organization for releasing lists of endangered species.
Option D: Incorrect. UN is a global organization but does not specifically release lists of endangered species.

Frequently Asked Questions

What is biodiversity?

Biodiversity refers to the variety and variability of life forms within a given species, ecosystem, or planet. It encompasses the diversity of species, genetic diversity within species, and the variety of ecosystems.

How does habitat destruction affect biodiversity?

Habitat destruction, such as deforestation or surface mining, reduces the available space for species to live, leading to a decline in biodiversity. It can cause species to become endangered or extinct due to loss of their natural habitats.

What is the IUCN Red List?

The IUCN Red List is a comprehensive inventory of the global conservation status of biological species. It provides information on the extinction risk of species and is used to guide conservation efforts.

Why is genetic diversity important?

Genetic diversity is crucial for the survival of species as it allows them to adapt to changing environmental conditions. It also ensures that populations have a range of traits that can help them resist diseases and other threats.

How do invasive species impact native plants and animals?

Invasive species can outcompete native plants and animals for resources, leading to a decline in native biodiversity. They can also alter ecosystems and disrupt the balance of species interactions.

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