Concept explainers
Introduction: Every species in an environment plays a crucial role in maintaining the balance of the environment and affects the existence of other dependent species. Some species are at the verge of nonexistence and they are called endangered species.
Answer to Problem 1TY
Correct answer: Endangered species is a species that is in danger of becoming extinct throughout all or a significant portion of its range. This statement best describes an endangered species. Hence, the correct answer is option d.
Explanation of Solution
Reason for correct answer:
Endangered species are the species that are at the verge of extinction from the whole world. If the species are not looked after or properly cared, then these species can seize to exist. This is not exactly limited to a particular portion of the species instead it is applicable to the complete range.
Option d. is given as “a species that is in danger of becoming extinct throughout all or a significant portion of its range”.
Endangered species are the species that are at the verge of extinction and the existence of these species is threatened to a significant or throughout all portion of its range. Hence, the correct answer is option d.
Reason for incorrect answer:
Option a. is given as “a species that is likely to become extinct in a portion of its range”.
Endangered species are likely to become extinct through all of its range and the threat of extinction is not limited to a small range. Hence, option a. is incorrect.
Option b. is given as “a species that has disappeared in a particular community but is present in other natural environments”.
A species is called endangered species if it has almost disappeared from the natural environment and not just from few communities. Hence, option b. is incorrect.
Option c. is given as “a species that is extinct”.
The endangered species are not completely extinct and can be saved if proper preventive measures are undertaken. Hence, option c. is incorrect.
Option e. is given as, “Both b and d are true of endangered species”.
Option d “a species that is in danger of becoming extinct throughout all or a significant portion of its range” is the correct explanation of endangered species. However, option b “species that have disappeared in a particular community but is present in other natural environments” does not explain endangered species. Hence, option e. is incorrect.
Hence, the options a., b., c. and e. are incorrect.
The given statement “endangered species is a species that is in danger of becoming extinct throughout all or a significant portion of its range” best describes an endangered species.
Want to see more full solutions like this?
Chapter 60 Solutions
BIOLOGY-TEXT
- If an ecosystem is greatly altered by the removal of a species, that species is referred to as A. Endangered B. Keyston C. Founder Species D. K-selectedarrow_forwardEcological dominants are a. the most numerous or make up the most biomass within a community. b. are species that may not be the most numerous within a community, but whose role is so significant that its absence would bring about considerable change. c. species that are introduced into an area where they do not naturally occur. d. the most important species on the planet.arrow_forwardAn _______species has population levels so low it is at great risk of extinction in the near future. a. endemic c. indicator b. endangered d. exoticarrow_forward
- The Arabian leopard in Oman is an example of what kind of species Select one: O a. Extinct O b. Endangered O C. Threatened O d. Safe O e. None of the answers are correctarrow_forwardWhich of the following is not true of a population of largepredators in a small reserve?a. The species may disappear from the reserve.b. The species will probably undergo a populationexplosion.c. The species will probably lose genetic diversity.d. The species may overeat its prey, causing a reduction inprey population.arrow_forwardWhen populations are drastically reduced in size, genetic diversity and heterozygosity a. are likely to increase, enhancing the probability of extinction. b. are likely to decrease, enhancing the probability of extinction. c. are usually not factors that influence the probability of extinction. d. automatically respond in a way that protects populations from future changes.arrow_forward
- Habitat fragmentation can reduce biodiversity by a. introducing more native species into a habitat b. sterilizing for pollution control C. decreasing human use of natural resources d. eliminating vast tracts of forests e. withdrawing an essential resource from native speciesarrow_forward_____ is a term describing species that are in danger of becoming endangered. a. extinct b. extirpated c. endangered d. threatenedarrow_forwardHabitat fragmentation results from human activities that change large blocks of landscape, leading to many negative effects on species and ecosystems. Which of the following is not one of the possible consequences of fragmentation? A. reduction of available habitat O B. increasing degradation of habitat patches C. increasing wind speeds and temperatures at patch edges D. spatial isolation of patches E. increase in top predators present in patchesarrow_forward
- A conservation biologist has been asked to explain why it is important to protect biodiversity. She would list all of the following reasons except for which one? A. Humans are dependent on many species for food, medicines, fiber, and other necessities. B. Biodiversity can be exploited indefinitely for the profit of humans. C. Other species have inherent value and humans have a moral obligation to protect them. D. Biodiverse ecosystems provide ecosystem services that sustain all life on Earth. E. Biodiversity provides emotional and physical health benefits by providing places for humans to visit for wonder, insight, and exercise.arrow_forwardRabbits are important grazers, maintaining some important grassland habitats. If a catastrophe were to reduce rabbit populations what would happen? * a. There would be more grass for the surviving rabbits b. The grassland would be invaded by trees and shrubs c. All of the abovearrow_forwardWhich of the following is NOT one of the main causes of today’sbiodiversity crisis?a. Natural disasters, such as earthquakesb. Habitat destruction and degradationc. Overexploitationd. Introduction of nonnative speciesarrow_forward
Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning