Chapter 21, Problem 6STP

Summary Introduction

Introduction:

Fungi are classified by their structure and patterns of reproduction. Some fungi only can reproduce asexually through mitosis. Asexual reproduction in fungi also includes fragmentation, budding, and spore production. Many fungi can reproduce both asexually and sexually. Sexually reproducing fungi produce spores by the process of meiosis.

Answer to Problem 6STP

Correct answer :

The correct answer is option (D) Zygomycota

Explanation of Solution

Explanation/justification for the correct answer :

Option (D) Zygomycota. In zygomycota, zygospores are formed by the fusion of haploid cells. This zygospore germinates and undergoes meiosis to produce hyphae with a sporangium. Each haploid spore formed in the new sporangium can grow into a new mycelium. Therefore, the given image is the reproductive structures of zygomycota. So, the correct answer is option (D).

Explanation for incorrect answer :

Option (A) Ascomycota. In Ascomycota, the sexual reproduction is complicated. It takes place when hyphae from opposite mating types fuse and one nucleus from each type pairs off in separate cells. The hyphae will develop a special reproductive structure called ascocarp. Therefore, the given image is not the reproductive structures of Ascomycota. So, this is an incorrect option.

Option (B) Basidiomycota. Basidiomycota produce asexual spores. The mycelium will produce sexually by forming a basifiocarp. Therefore, the given image is not the reproductive structures of Basidiomycota. So, this is an incorrect answer.

Option (C) Deuteromycota. The sexual reproduction in these fungi never has been observed. Because these fungi appear to lack a sexual stage, they are referred as the imperfect fungi. Therefore, the given image is not the reproductive structures of Deuteromycota. So, this is an incorrect answer.