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Mastering Biology Chapter 31
Terms in this set (27)
The following statements describe something about the body structures or functions of fungi. Identify those statements that are correct.
-Mycelia are made up of small-diameter hyphae that form an interwoven mass, providing more surface area for nutrient absorption.
-All fungi are heterotrophs; some species live as decomposers and others as symbionts.
-Some fungi can grow as either filamentous or single-celled forms.
-Some fungi secrete digestive enzymes into the environment and then absorb the digested nutrients.
Which of the following is a difference between plants and fungi?
Fungi are heterotrophic, and plants are autotrophic.
Fungi obtain nutrients through _____.
The body of most fungi consists of threadlike _____, which form a network called a _____.
hyphae ... mycelium
The diploid phase of the life cycle is shortest in which of the following?
What sexual processes in fungi generate genetic variation?
karyogamy and meiosis
An important example of interaction between fungi and certain other organisms is mycorrhizae, in which the fungal partners _____.
help plants take up nutrients and water
Fungi produce _____ spores.
Karyogamy produces a _____.
Plasmogamy is indicated by the letter _____.
B (fusion of cytoplasm)
Which of these contains two haploid nuclei?
the heterokaryotic stage of the fungal life cycle
The process indicated by the letter _____ produces a diploid structure.
C (marks the fusion of nuclei)
Cup fungi are in the phylum _____.
Which term describes the fusion of cytoplasm from two individuals?
Which structure is not directly involved in the reproduction of at least one major group of fungi?
True or false? In most fungi, fertilization is complete after the cells fuse together.
Where does meiosis occur in a mushroom?
Which structure allows the growing mushroom to nourish itself?
Which of the following events occurs first in the development of a spore into a mature mushroom?
Hyphae are produced by mitosis.
True or false? Most of the cells in a mushroom contain haploid nuclei.
Almost all of the members of this phylum form arbuscular mycorrhizae in a mutualistic partnership with plants.
Fungi of the phylum Ascomycota are recognized on the basis of their production of _____ during sexual reproduction.
Fungi form mutualistic relationships with plants and animals. Which of the following is an example of such a relationship?
All of the above.
From the human perspective, which of the following kinds of fungi would be considered the least useful or beneficial?
Do the data indicate that the chytrid caused or is correlated to the drop in frog numbers?
The timing of the declines and the survival of frogs treated with fungicides suggest that the chytrid caused the decline in frog populations.
Which statement(s) correctly describe(s) the interactions between plants and fungi?
-Plants depend on fungi as mutualistic symbionts.
-Plants are harmed by fungal pathogens.
In fungi, haploid hyphae fuse to produce dikaryotic and then diploid nuclei, only to restore the haploid condition by meiosis before the growth of new hyphae. What is the significance of a transient diploid state in fungi?
These sexual processes generate genetic variation.
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