Biology
12th Edition
ISBN: 9781260494570
Author: Raven, Peter
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 29, Problem 2S
Would you expect the sporophyte generation of a moss or a fern to have more mitotic divisions? Why?
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Which of the following statements about the haplodiplontic life cycle of land plants is/are TRUE?
A During the sporophyte stage, sporangia house diploid mother cells that will eventually undergo meiosis.
B Sperm develop from mitosis in the archegonium.
C Spores grow by mitosis into mature haploid gametophytes.
D The gametophytic stage begins with a diploid spore.
EA and C are both true.
If ferns produce spores, are they a sporophyte or agametophyte? Are they haploid or diploi
Describe two differences between a fern sporophyte and a moss sporophyte.
Are fern spores haploid or diploid? Are the spores produced by meiosis or mitosis? Where are the spores produced?
Do mosses have an alternation of isomorphic or heteromorphic generations? That is, can you easily tell a moss gametophyte from a moss sporophyte? When we look at leafy green moss plants, what are we seeing—the gametophyte or the sporophyte? In a flowering plant species, would the equivalent stage be the plant or the pollen grains and megagametophytes?
Chapter 29 Solutions
Biology
Ch. 29.1 - Explain the relationship between the different...Ch. 29.1 - Prob. 2LOCh. 29.1 - Prob. 3LOCh. 29.1 - Prob. 4LOCh. 29.2 - Describe adaptations of bryophytes for life on...Ch. 29.3 - Prob. 1LOCh. 29.3 - Evalute the signification of roots, stems, and...Ch. 29.4 - Prob. 1LOCh. 29.4 - Prob. 2LOCh. 29.5 - Prob. 1LO
Ch. 29.5 - Prob. 2LOCh. 29 - Compare the amount of time that passed between the...Ch. 29 - Explain why tracheophytes may have had a selective...Ch. 29 - Which of the following plant structures is NOT...Ch. 29 - Which of the following genera most likely directly...Ch. 29 - Which of the following would NOT be found in a...Ch. 29 - Prob. 4UCh. 29 - Evolutionary innovations that increase desiccation...Ch. 29 - Which of the following statements about the...Ch. 29 - Compare what happens to a spore mother cell as it...Ch. 29 - How could a plant without roots obtain sufficient...Ch. 29 - A major innovation of land plants is embryo...Ch. 29 - In comparing the Selaginella and Physcomitrella...Ch. 29 - Prob. 5ACh. 29 - Identify which of the following statements is...Ch. 29 - You have access to the sequenced genomes for moss...Ch. 29 - Would you expect the sporophyte generation of a...Ch. 29 - Imagine hypothetical moss and fern trees, each 10...
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- In ferns, which of these would be formed by meiosis inside a sporangium? haploid spores diploid spores diploid zygote haploid spermarrow_forwardReproductive structures are the critical factors in distinguishing algae from true plants of kingdom Plantae. What is one fundamental difference between reproductive structures in these two groups?arrow_forwardAre fern spores haploid or diploid? Are the spores proudced by meiosis or mitosis? Where are the spores produced?arrow_forward
- Which of the following pairs of plant structure has the haploid number ofchromosomes? A. Megaspore mother cell and antipodal cells B. Egg cell and antipodal cells C. Egg cell and endosperms D. Microspore mother cell and antipodal cellsarrow_forwardIs the protonema part of the gametophyte or sporophyte generation?arrow_forwardEarly botanists admired ferns but found their life cycle perplexing. In the 1700s, they learned to propagate ferns by sowing what appeared to be tiny dustlike “seeds” from the undersides of fronds. Despite many attempts, the scientists could not find the pollen source, which they assumed must stimulate these “seeds” to develop. Imagine you could write to one of these botanists. Compose a note that would clear up the confusion.arrow_forward
- You are studying a type of plant known as " rockcress" or Arabidopsis sp. You discover a mutant in which the central cell of the female gametophyte cannot be fertilized. What structure will not form in these mutant plants? Synergids Pollen tube Endosperm Egg cellarrow_forwardWhich of the following is a universal feature of the life cycles of land plants? Genetically identical gametophyte and sporophyte stages Multicellular haploid and diploid gametes Morphologically identical gametophyte and sporophyte stages Alteration of generations between haploid gametophytes and diploid sporophytesarrow_forwardEarly botanists admired ferns but found their life cycle perplexing. In the 1700s, they learned to propagate ferns by sowing what appeared to be tiny dust like “seeds” that they collected from the undersides of fronds. Despite many attempts, the botanists could not locate the pollen source, which they assumed must stimulate these “seeds” to develop. Imagine you could write to these botanists. Compose a note that explains the fern life cycle and clears up their confusion.arrow_forward
- Which of the following processes occurs in a plant's sexual life cycle? sporophytes produce gametes by meiosis sporophytes produce gametes by mitosis gametophytes produce gametes by meiosis gametophytes produce gametes by mitosisarrow_forwardMitosis of diploid cells Single-celled, diploid zygote Multicellular, diploid sporophyte Sperm Fertilization Haploid spores Mitosis of haploid cells Egg Meiosis Multicellular, haploid gametophytearrow_forwardWhich two structures evolved though a series of changes in the reproductive biology among some heterosporous plants during the late Devonian period allowed spermatophytes (seed plants) to reduce or eliminate their dependence on water for gamete fertilization and development of the embryo and allowed them to colonize a much wider range of habitats?arrow_forward
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