Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 22, Problem 1DAA
Insect-Assisted Fertilization in Moss Moss sperm can swim, but plant ecologist Nils Cronberg suspected that they sometimes hitch a ride on crawling insects or mites (tiny animals related to spiders). To test this hypothesis he carried out an experiment. He placed patches of male and female moss gametophytes in dishes, either next to one another or with water-absorbing plaster between them. The plaster prevented sperm from swimming between plants. He then looked at how the presence or absence of insects affected the number of sporophytes formed. FIGURE 22.30 shows his results.
FIGURE 22-30 Sporophyte production in female moss patches with and without either crawling insects (springtails) or mites. No sporophytes formed in the animal-free dishes when moss patches were 2 or 4 centimeters apart.
1. Why is sporophyte formation a good way to determine if fertilization occurred?
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Chapter 22 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 22 - The first land plants were ___ . a. gnetophytes b....Ch. 22 - Prob. 2SQCh. 22 - A waxy cuticle helps land plants ___ . a. oonserve...Ch. 22 - True or false? Ferns produce seeds inside sori.Ch. 22 - ___ attach mosses to soil. a. Rhizoids b. Rhizomes...Ch. 22 - Bryophytes alone have a relatively large ___ and...Ch. 22 - Club mosses, horsetails, and ferns are ___ plants....Ch. 22 - Coal consists primarily of compressed remains of...Ch. 22 - Insect-Assisted Fertilization in Moss Moss sperm...Ch. 22 - Prob. 2DAA
Ch. 22 - Prob. 3DAACh. 22 - The sperm of swim to eggs. a. mosses b. ferns c....Ch. 22 - A seed is a(n) ___ . a. female gametophyte b....Ch. 22 - Prob. 11SQCh. 22 - Which angiosperm lineage includes the most...Ch. 22 - Match the terms appropriately. ____ bryophyte a....Ch. 22 - Match the terms appropriately. _____ovule a....Ch. 22 - Place these groups. in order of their appearance...Ch. 22 - Early botanists admired ferns but found their life...Ch. 22 - Prob. 2CTCh. 22 - Prob. 3CTCh. 22 - Compared to vascular plants, bryophytes arc more...Ch. 22 - Lignin and vascular tissue first evolved in...
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