Chapter 31
1.Identify each statement as TRUE or FALSE.
a.Fungi are more closely related to plants than to animals.
b.Fungi do not produce gametes.
c.Fungi have sex but do not have male or female genders.
d.In some fungi, plasmogamy may precede karyogamy by decades.
2.Which of the following ecological roles are played by some fungi? Choose all correct answers.
a.Decomposition
b.Predation
c.Mutualistic symbiont
d.Autotroph
Questions 1
Ans - a - FALSE, --- Fungi and animals are more closely related to one another than either group is to plants. This has been determined through molecular phylogenetic analyses. Fungal cells are organized into tube-like filaments called hyphae.
Ans - b - FALSE, ---
Organisms having zygotic meiosis are fundamentally haploid. Growth and mitotic cell divisions always involve haploid cells. These organisms produce gametes (sex cells equivalent to sperm and egg) via mitosis, since they themselves are already haploid. Gametes may be produced in a great variety of structures, but ultimately the gametes must come together, fuse and form a diploid zygote. The zygote never divides mitotically; instead it undergoes meiosis and the resulting cells are again haploid, thereby completing a full life cycle. The following are characteristic of zygotic meiosis:
GAMETANGIAL MEIOSIS
Organisms having gametangial meiosis are fundamentally diploid. Growth and mitotic cell divisions always involve diploid cells. These organisms produce gametes via meiosis, since, unlike their gametes, they themselves are diploid. Gametes are produced in structures called gametangia. Gametangia contain diploid cells (at least initially) but some or all of these undergo meiosis to form the gametes. The gametes ultimately fuse to form a zygote. The zygote, which is already diploid like its parents, never undergoes meiosis, but instead develops by mitotic divisions, thereby completing the full life cycle. Humans have this type of life cycle. The following are characteristic of gametangial meiosis:
QUESTIONS 2 ,
Ans- a.
Key Points
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Chapter 31 1.Identify each statement as TRUE or FALSE. a.Fungi are more closely related to plants...
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