Campbell Biology Plus Masteringbiology
10th Edition
ISBN: 9780321775849
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Chapter 38.2, Problem 3CC
Summary Introduction
To explain: The reason why selfing is an advantageous procedure and yet an evolutionary dead end.
Concept introduction: Self-pollination is the pollination of a flower (in flowering plants) by a pollen grain from same or other flower on same plant. Selfing is an “evolutionary dead-end” because it causes loss of genetic diversity and seldom introduces new characters.
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Self-fertilization, or selfing, seems to have obvious disadvantages as a reproductive “strategy” in nature, and ithas even been called an “evolutionary dead end.” So it issurprising that about 20% of angiosperm species primarily rely on selfing. Suggest a reason why selfing might beadvantageous and yet still be an evolutionary dead end.
Most flowers contain both male and female reproductive structures, in contrast to the cones of gymnosperms, which are either male or female. Explain how bisexual flowers might be an advantageous evolutionaryadaptation to the flowering plants that possess them.
Most extant species of gymnosperms are now considered as "living fossils", why is that so? Give some insights on why gymnosperms were not able to dominate land despite of having seeds.
Chapter 38 Solutions
Campbell Biology Plus Masteringbiology
Ch. 38.1 - Distinguish between pollination and fertilization.Ch. 38.1 - Prob. 2CCCh. 38.1 - Prob. 3CCCh. 38.1 - Prob. 4CCCh. 38.2 - What are three ways that flowering plants avoid...Ch. 38.2 - Prob. 2CCCh. 38.2 - Prob. 3CCCh. 38.3 - Compare traditional plant-breeding methods with...Ch. 38.3 - Why does Bt maize have less fumonisin than non-GM...Ch. 38.3 - WHAT IF? In a few species, chloroplast genes are...
Ch. 38 - What changes occur to the four types of floral...Ch. 38 - Prob. 38.2CRCh. 38 - Prob. 38.3CRCh. 38 - A fruit is (A) a mature ovary. (B) a mature ovule....Ch. 38 - Prob. 2TYUCh. 38 - Prob. 3TYUCh. 38 - Prob. 4TYUCh. 38 - Prob. 5TYUCh. 38 - A small flower with green petals is most likely...Ch. 38 - The black dots that cover strawberries are...Ch. 38 - DRAW IT Draw and label the parts of a flower.Ch. 38 - Prob. 9TYUCh. 38 - Prob. 10TYUCh. 38 - SCIENCE, TECHNOLOGY, AND SOCIETY Humans have...Ch. 38 - WRITE ABOUT A THEME: ORGANIZATION In a short essay...Ch. 38 - Prob. 13TYU
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- Double fertilization evolved independently in gnetophytes and in flowering plants. Name two other features usually associated with angiosperms that evolved independently in gymnosperms.arrow_forwardMost angiosperms incorporate the assistance of animals in their reproductive cycle. This is a major advancement that gave them an advantage over other plant lineages and helped them become the dominant type of plant on Earth today. Which of the following steps in the reproduction of angiosperms do animals assist with? Check all that apply. A. Seed dispersal B. Pollination C. Fertilizationarrow_forwardThere are the two main characteristics specific to members of angiosperm and attributed as the reason for their success and diversity. What are they and explain how each contributes to the success of this group of plantsarrow_forward
- Most angiosperms incorporate the assistance of animals in their reproductive cycle. This is a major advancement that gave them an advantage over other plant lineages and helped them become the dominant type of plant on Earth today. Which of the following steps in the reproduction of angiosperms do animals assist with? Check all that apply. Pollination Fertilization Seed dispersalarrow_forwardAn angiosperm which is unable to form fruits would likely have which of the following defects? it would not be able to attract pollinators it would not be able to provide nutrients to the embryo • it would not be able to disperse seeds it would not be able to form seedsarrow_forwardAnswer the following question: What is meant by “double fertilization”? What features of seeds and fruits have enabled angiosperms to become so widespread?arrow_forward
- Angiosperms are the most diverse group of plants on the planet, by far. However, using flowers for reproduction does have potential disadvantages. Briefly describe two possible challenges (e.g., problems, risks, costs, etc.) that might be associated with using flowers as a reproductive strategy.arrow_forwardAngiosperms ( flower bearing ) plants developed after gymnosperms ( cone bearing ) plants during the Mesozoic era Which of the following is a benefit to plants developing the ability to have flowers over cones ? ANSWER CHOICES ARE IN THE PHOTO. thanks.arrow_forwardConsidering the trends in floral evolution, how do you think these changes contribute in ensuring successful sexual reproduction among angiosperms? Cite at least two (2) examples of plants exhibiting advanced floral features to support your answer.arrow_forward
- Double fertilization is important to the reproductive process of an angiosperm because it produces: -a reaction that keeps the plant from dying. -nutrition for the seed. -both the zygote and the endosperm. -a double portion of endosperm. -None of these choices are true.arrow_forwardDiscuss two reasons why angiosperms have been so much more evolutionarily successful than gymnosperms.arrow_forwardBoth gymnosperm and angiosperm bear seed ,then why are they classified seperatedly?arrow_forward
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