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Concept explainers
To determine: The ways in which the white rhinos can be used to increase the reproduction of Javan and Sumatran rhinos.
Introduction: Rhinoceros is an endangered species and belongs to the family Rhinocerotidae. They are native to Africa and Southern Asia. They are the largest herbivores present on the Earth. There are known predators for rhinos and they are either killed by humans for their horns. Javan rhinoceros is the world’s largest endangered mammals in the world.
To determine: The advantages and challenges or obstacles in the artificial insemination.
Introduction: Artificial insemination is the intentional introduction of sperm into a female’s reproductive tract in order to achieve a pregnancy through in vivo fertilization.
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Chapter 42 Solutions
Pearson eText Biology: Life on Earth with Physiology -- Instant Access (Pearson+)
- What are three aspects of your lifestyle that might directly or indirectly contribute to declines in European honeybee populations and the endangerment of other pollinator species (Core Case Study)?arrow_forwardThe pesticide DDT was widely used in the 1940s as a method of insect control. In the late 1950s the first DDT-resistant mosquitoes were discovered, and eventually DDT-resistant mosquitoes were found globally. When DDT is used now, the development of DDT resistance in mosquito populations occurs in months rather than years.Which of the following best explains the observations concerning DDT resistance in mosquitoes? a) The proportion of DDT-resistant mosquitoes in a population remains constant due to the metabolic costs of DDT utilization b) Natural selection favors DDT-resistant mosquitoes that are already present in a population when DDT exposure occurs. c) DDT is a chemical signal that delays normal reproductive cycles in many mosquito populations. d) Competition for limited resources causes mosquitoes to migrate to geographical areas that have richer supplies of DDT.arrow_forwardA scientist for one of the Water Management Districts near Victoria conducts a study of the effects of industrial wastewater on marine clams (animals that are sessile as adults) by comparing the density and reproductive condition of clams collected within 100 m of a discharge pipe with those collected 10 km away. He found very low densities of clams near the pipe and those that were there had very small gonads. You have been hired by the company discharging wastewater via this pipe to explain why these data should not be used to shut you down. What scientific arguments are you going to make to the review board? Hint: don’t talk about study design issues….tell me about what other ecological factors might be at play here.arrow_forward
- Are the following primates (same species) exhibiting sexual dimorphism? Explain your reasoning:arrow_forwardIs the following case study an r-strategists or a K-strategists? Andean condors reach sexual maturity at five to six years. Reproduction is slow; females lay only one or two eggs every other year. Offspring are cared for by both parents for at least one year. Andean condors are long-lived and can survive for seventy to seventy-five years.arrow_forwardAll of the following scenarios are examples of barriers that distinguish separate species. Which is not a post-zygotic barrier? Two species of ladybugs live in the same habitat. Although they mate at the same time of year, their genitals are physically incompatible. Two species of fish inhabit the same stream. They are capable of mating and producing healthy offspring. The offspring, however, are infertile. and 2 Two species of opossums inhabit the same forest. Although they are capable of mating, no offspring ever survive development. hschool 3, Two species of mice coexist in a forest habitat. They are capable of mating and producing offspring. The offspring, however, are frail and die young. When Charles Darwin visited the Galapagos Islands, he observed the marine iguana. He later decided that the marine iguana evolved from the terrestrial iguana found on the mainland of South America. The marine iguana differs from the terrestrial iguana in several ways. The marine iguana has a flat…arrow_forward
- Write the definition of the following terms: 1. Semelparous life history 2. Iterous species 3. Senescence 4. Antagonistic pleiotropy 5. Carrying capacityarrow_forwardAll of the following scenarios are examples of barriers that distinguish separate species. Which is not a post-zygotic barrier? * Two species of ladybugs live in the same habitat. Although they mate at the same time of year, their genitals are physically incompatible. Two species of fish inhabit the same stream. They are capable of mating and producing healthy offspring. The offspring, however, are infertile. Two species of opossums inhabit the same forest. Although they are capable of mating, no offspring ever survive development. Two species of mice coexist in a forest habitat. They are capable of mating and producing offspring. The offspring, however, are frail and die young.arrow_forwardFemales of a lizard species each produced, on average, about 15 eggs during one breeding season, and about the same number of eggs during each of the next four breeding seasons. This suggests that Group of answer choices the cost of reproduction is relatively high for these females the idea of trade-offs does not apply to this species the cost of reproduction is relatively low for these females this species is semelparous there must be high mortality among females in this speciesarrow_forward
- In an iteroparous species lifetime fitness is maximized at investment, while in semelparous species level of reproductive an intermediate maximal effort is exerted in a single reproductive event Maximal an intermediate effort is exerted in one of many reproductive events an intermediate minimal effort is exerted in a single reproductive event maximal an intermediate effort is exerted in a single reproductive event an intermediate maximal effort is exerted in one of many reproductive eventsarrow_forwardIn 1970, Atlantic leatherback sea turtle populations were very low, and the U.S. Fish and Wildlife Service listed the species as endangered. Over the next several decades, steps were taken to protect turtle nests and prevent accidental killing of turtles at sea by fishing fleets. As a result, the population of leatherbacks nesting on beaches in Florida has been growing exponentially (FIG. E31-3). What factors probably contributed to this exponential growth? Can exponential growth continue? If not,what factors are likely to cause the population to stabilize?arrow_forwardYou've been out in the field collecting data on the predation of holly leaves. You collect 200 leaves in total of which 100 leaves contain one mine, 20 leaves contain 2 mines and 30 leaves contain 3 mines. After close examination with your hand lens and dissecting microscope you categorize a total of 15 mines with round holes, 9 mines that were torn open and 27 mines with an irregular hole. After some basic analyses you conclude that the predation rates by blue tits and wasps are: A. 3.7% and 6.5% B. 6% and 10% C. 10% and 6% D. 4% and 6.5%arrow_forward
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