Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 30.2, Problem 3CC
Self-fertilization, or selfing, seems to have obvious disadvantages as a reproductive “strategy” in nature, and it has even been called an “evolutionary dead end.” So it is surprising that about 20% of
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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.
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.
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Chapter 30 Solutions
Campbell Biology in Focus (2nd Edition)
Ch. 30.1 - WHAT IF? If flowers had shorter styles, pollen...Ch. 30.1 - WHAT IF? In some species, sepals look like petals,...Ch. 30.1 - Prob. 3CCCh. 30.2 - Prob. 1CCCh. 30.2 - Prob. 2CCCh. 30.2 - Self-fertilization, or selfing, seems to have...Ch. 30.3 - Prob. 1CCCh. 30.3 - Why does Bt maize have less fumonisin than non-GM...Ch. 30.3 - WHAT IF? In a few species, chloroplast genes are...Ch. 30 - A seed develops from an A. ovum B. embryo. C....
Ch. 30 - A fruit is a A. mature ovary. B. B . mature ovule....Ch. 30 - Double fertilization means that A. flowers must be...Ch. 30 - Golden Rice A. is resistant to various herbicides,...Ch. 30 - Which statement concerning grafting is correct? A....Ch. 30 - Some dioecious species have the XY genotype for...Ch. 30 - A small flower with green petals is most likely A....Ch. 30 - The pollen produced by wind-pollinated plants is...Ch. 30 - The black dots that cover strawberries are...Ch. 30 - DRAW IT Draw a flower and label the parts.Ch. 30 - SCIENTIFIC INQUIRY Critics of GM foods have argued...Ch. 30 - SCIENCE, TECHNOLOGY, AND SOCIETY People have...Ch. 30 - FOCUS ON EVOLUTION With respect to sexual...Ch. 30 - FOCUS ON ORGANIZATION In a short essay (100-150...Ch. 30 - SYNTHESIZE YOUR KNOWLEDGE This colorized SEM shows...
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- One difference between mosses and angiosperms (flowering plants) is that: 1. mosses spend equal amounts of time in the gametophytic and sporophytic phases of the life cycle 2. angiosperms spend more time in the haploid phase of the life cycle 3. angiosperms spend more time in the diploid phase of the life cycle 4. a & b 5. a & carrow_forwardIn their experiments with the flowers of Begonia involucrate, Agren and Schemske (1991) observed that there was a trade-off between what two characteristics? Size of flower and number of flowers on inflorescence Size of flower and pollination Annual versus perennial reproduction O Time and expense to grow the pollen tube versus cost of maintaining the flower on the treearrow_forwardThe best answer describing angiosperm fertilization is: O a single sperm fertilizes an egg a single sperm fertilizes the antipodal cells O a single sperm fuses with the two polar nuclei one sperm fertilizes the egg, one fuses with the two polar nuclei to create 3N tissue one sperm fertilizes the egg, one fuses with the antipodal cells to create 3N tissuearrow_forward
- 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.arrow_forwardThe Cretaceous Period was marked by the increase in number and variety of angiosperms. Insects also diversified enormously during the same period. Can you propose the reason or reasons that could foster coevolution?arrow_forwardA team of botanists discovers a new species of plant in a tropical rain forest. After observing its anatomy and life cycle, they note the following characteristics and observations: 1. Presence of pollen cones and ovulate cones 2. Diploid-dominant 3. Seeds 4. vascular tissues 5. Absence of anything that resembles a flower This plant is probably a(n) Group of answer choices moss angiosperm protist gymnosperm fernarrow_forward
- Plants and animals originated in water environments and, much later, plants invaded the land and later still, animals invaded the land. a) With respect to the four groups of plants (Bryophytes, seedless vascular plants, Gymnosperms, and Angiosperms), give the basic method of fertilization. That is, how do the sperm reach the eggs? b) What is the significance of the fertilization methods to the invasion of the land by the Gymnosperms and Angiosperms?arrow_forwardFerns are a type of terrestrial plant that does not produce seeds, unlike gymnosperms and flowering plants. This significant evolutionary divergence contributed to the dominance of gymnosperms and flowering plants. How might the ability to produce seeds have advantaged these groups? It allowed these plants to photosynthesize more efficiently. It allowed these plants to attract more pollinators. It allowed these plants to better disperse, colonize new habitats, and survive drier conditions. It allowed these plants to grow taller and compete for sunlight.arrow_forwardIn angiosperms, usually play(s) a role in pollination, while fertilization is performed by animals; two sperm wind; spores animals; spores fire; two sperm animals; one spermarrow_forward
- An alternation of generation life cycle in plants is advantageous because: each generation is morphologically similar. it protects reproductive structures. the gametes fuse in open water. it is haploid-dominant.arrow_forwardWhich statement below is correct regarding the formation of the endosperm in angiosperms? O the endosperm is formed from the female gametophyte and is haploid O a single sperm nucleus fertilizes the egg nucleus to become the diploid zygote O a sperm nucleus forms both the zygote and the endosperm through double fertilization O a second sperm nucleus fuses with the two polar nuclei of the egg sac МacВook Pro G Search or type URL @ 2# $ & * 2 3 4 6 8 W E R Yarrow_forwardAnd some plants as stigma becomes receptive to Polin able to facilitate a pollen tube at a different time from when the anthers ripen. How would this affect the plant reproductive strategy why would this increase diversity in the plants offspring?arrow_forward
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