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In all members of Ascomycetes, the number of ascospores and their arrangement in an ascus are as follows
A. Eight ascospores in a linear order
B. Four ascospores in a linear order
C. Either eight or four ascospores, but always in a linear order
D. Either eight or four ascospores in a linear order or unordered

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Last updated date: 18th Jun 2024
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Answer
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Hint: One of the phyla of the Fungi kingdom is Ascomycota. The members of this phylum are generally referred to as Ascomycetes or sac fungi. It is the largest phylum of fungi consisting of over 64,000 species in the kingdom.

Complete answer: Ascomycetes: The existence of 'ascus' is the defining function of the members of this group. The ascus is a sexual microscopic system in which ascospores are produced. Ascospores are non-motile spores. Inside the ascus, as the spores grow, they raise fluid pressure within, and finally, the top of the ascus bursts off and releases all the spores. There is a complex environment for ascomycetes. Some members of ascomycetes are saprophytes and some are pathogens that cause disease. Examples-Cladonia, Penicillium, Claviceps, etc. Every ascus is made of 4 to 8 endogenous meiospores called ascospores, organized either linearly or unorderly (Neurospora) (Yeast). Many Ascomycetes species are used in biological studies and analysis such as yeast and Neurospora. Ascomycetes contain many organic acids and enzymes. Citric acid, gluconic acid, amylase, etc, instance. As fungal delicacies, Morels, Truffles, lobster mushrooms are used.
Hence, option D-Either eight or four ascospores in a linear order or unordered is the correct answer.

Note: Ascomycetes organisms used in biochemical and genetic work. Neurospora is the member of Ascomycetes used for biochemistry and genetics. It is commonly used as a model organism in genetics since it has the ability to divide rapidly and is also simple to cultivate. It can also live on limited media (glucose, water, inorganic salts, biotin in agar, etc).