Concept explainers
To determine: How self-incompatible species are in severe population bottleneck compared to self-fertile species.
Concept introduction: Self-incompatibility is a genetic mechanism in
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- QUESTION 10 Which is true regarding plant reproduction?   Self-pollination produces offspring genetically identical to the parent   modified organs, such as corms and bulbs, are produced as a result of sexual reproduction   cross-pollination allows plant populations to survive in unstable environments   plants do not reproduce asexually   vectors such as flies carry plant spores to new locationsarrow_forwardThe drooping, bell-like flower Aquilegia canadensis is adapted for cross-pollination. However, if the plant has not been pollinated previously, self-pollination can occur. However, if cross pollination occurs after self-pollination takes place, the pollen from cross pollination reaches the style before the pollen from self-pollination. Using course concepts and vocabulary 1) Provide a reasoning for this phenomenon. 2) Would this adaptation for reproduction be beneficial for the plant?arrow_forward"One of the great myths surrounding the development of human culture over the past 10,000 years is that things got progressively better as we moved from our hunter-gatherer existence to the sublimely elevated state in which we live today." Why does Spencer Wells refer to this "sublime elevation" as a "myth"? Identify a few of his key points as outlined in Pandora's Seed. Respond to one or more of these points, or to the characterization as a whole. Do you agree with Wells? Why, or why not?arrow_forward
- Intraspecific competition is a competition between members of the same species and is commonly observed in crop plants. Table 6.2 shows the results of a greenhouse experiment which examined the effects of density on the germination and growth of barley. Plants were grown for two weeks in 10- cm diameter pots kept in identical environmental conditions and watered regularly. At the end of the experiment the plants were cropped by cutting the stems at the soil surface. Explain why knowledge of the effects in density is important to the crop farmer.arrow_forwardDescribe the challenges for plants in terms of resource circulation or dispersal of reproductive structures from an evolutionary perspective (as they moved from single celled to colonial, to small and then large terrestrial forms. Describe the progression of structures from early evolutionary groups to later evolutionary groups to solve one of these challenges in 2-4 paragraphsarrow_forwardSexual reproduction in plants is considered to be a source of variation creation. How reproduction mechanisms played their role in creating variation and also give view regarding the mechanism that could be responsible for causing a different type of pollinationarrow_forward
- A. What challenges face the next Green Revolution? B. What is Marker Assisted Breeding? C. Most of the improvement in agricultural crop yields has been through inputs: getting more fertilizer to the plant, decreasing weeds, spacing, reducing loss from pests and local environmental changes. But the next big engineering feat will be with the plant molecular pathways themselves, in particular, photosynthesis. The article refers to C3 and C4 plants. What are plant geneticists trying to accomplish? D. What is the #1 seller at Wal-Mart?arrow_forwardIn wild columbine, flower morphology encourages crosspollination. However, during the middle of the receptive period of the stigma, self-pollination can occur if the flower was not previously pollinated. If cross-pollination occurs after selfpollination, then that pollen reaches the base of the style before the self-pollen. Discuss the adaptive significance of this reproduction strategy.arrow_forwardCourse: Botany In stable populations, ones that are neither increasing nor decreasing in abundance (e.g., there are a million trees now and there will be a million trees a thousand years from now), about how many of a plant’s seeds survive and grow to adulthood, being able to replace it when it dies? If during the plant’s lifetime it produces 100,000 seeds, how many do not survive, do not grow, and cannot replace it when it dies. (Hint: Do not think of humans, as we are an increasing population, not a stable one. Almost all our children survive, but that is not true of any other species.) Answer and explain briefly.arrow_forward
- The enormous flower stalks of an Agave plant represent which of the following? Agaves are semelparous. Group of answer choices a. high investment in organismal growth b. low investment in reproduction and high investment in maintenance of the organism c. A very high investment in reproduction and none in maintenance of the organism d. High investment in both reproduction and maintenance of the organismarrow_forwardEVOLUTION LINK Like stems in general, some vines are herbaceous and others are woody. Tropical rain forests have a greater diversity of vines than in any other environment on Earth, and most of these vines are woody. Develop a hypothesis to explain why natural selection has favored the evolution of more species of woody vines (as opposed to herbaceous vines) in tropical rain forests.arrow_forwardWhich of the following observations would provide the strongest evidence that two plants belong to different biological species?  a.The leaves and flowers show morphological differences.  b.There are variations in their RNA sequences.  c.They produce viable but sterile offspring.  d.They occupy unique habitats in an ecosystem.arrow_forward
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage LearningBiology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning