Class XI · Biology practice

Biological Classification MCQs

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300 questions in this collection · Page 13 of 30

Question 121 of 300

📘 CLASS XI

Biological Classification

In fungi, what are hyphae that consist of continuous tubes filled with multinucleated cytoplasm called?

Coenocytic hyphae lack septa and contain multinucleate cytoplasm.

Question 122 of 300

📘 CLASS XI

Biological Classification

The first step in the sexual cycle of fungi involves the fusion of protoplasms between two motile or non-motile gametes. This is known as:

Plasmogamy is the fusion of protoplasms and is the first step of sexual reproduction in fungi.

Question 123 of 300

📘 CLASS XI

Biological Classification

An intervening dikaryotic stage (n + n) during sexual reproduction is a defining feature of which fungal classes?

A dikaryotic stage occurs characteristically in Ascomycetes and Basidiomycetes.

Question 124 of 300

📘 CLASS XI

Biological Classification

Which of the following is an obligate parasitic fungus on mustard plants belonging to Phycomycetes?

Albugo is a parasitic phycomycete commonly found on mustard.

Question 125 of 300

📘 CLASS XI

Biological Classification

In Phycomycetes, asexual spores that are motile are called _____, while non-motile ones are called _____.

Phycomycetes produce motile zoospores and non-motile aplanospores inside sporangia.

Question 126 of 300

📘 CLASS XI

Biological Classification

Yeast (Saccharomyces) is economically important for making bread and beer. To which class of fungi does it belong?

Saccharomyces is a unicellular member of Ascomycetes.

Question 127 of 300

📘 CLASS XI

Biological Classification

In Ascomycetes, how are the sexual spores (ascospores) and asexual spores (conidia) produced respectively?

Ascospores are formed inside asci, whereas conidia are produced externally on conidiophores.

Question 128 of 300

📘 CLASS XI

Biological Classification

Which member of Ascomycetes is extensively utilised in biochemical and genetic research?

Neurospora is widely used in biochemical and genetic studies.

Question 129 of 300

📘 CLASS XI

Biological Classification

In Basidiomycetes, sex organs are absent. How is plasmogamy achieved?

Plasmogamy in Basidiomycetes occurs through fusion of vegetative or somatic cells.

Question 130 of 300

📘 CLASS XI

Biological Classification

Following karyogamy and meiosis in the basidium, how many basidiospores are produced?

Each basidium produces four haploid basidiospores externally after meiosis.

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