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300 questions in this collection · Page 2 of 30
Question 11 of 300
📘 CLASS XI
Biological Classification
In the sexual cycle of fungi, the initial fusion of protoplasms between two motile or non-motile gametes is called:
Plasmogamy is the first step in fungal sexual reproduction, followed by karyogamy and meiosis.
Question 12 of 300
📘 CLASS XI
Biological Classification
An intervening dikaryotic stage (n + n), where there are two separate nuclei per cell, occurs in which of the following fungal groups?
Ascomycetes and Basidiomycetes show a prolonged dikaryotic (n+n) phase before karyogamy.
Question 13 of 300
📘 CLASS XI
Biological Classification
Which class of fungi is characterised by having an aseptate and coenocytic mycelium?
Phycomycetes possess aseptate, coenocytic mycelium as seen in Mucor and Rhizopus.
Question 14 of 300
📘 CLASS XI
Biological Classification
Neurospora, which is extensively used in biochemical and genetic work, belongs to which fungal class?
Neurospora is an ascomycete widely used in biochemical and genetic studies.
Question 15 of 300
📘 CLASS XI
Biological Classification
Deuteromycetes are commonly referred to as imperfect fungi because:
Deuteromycetes are called imperfect fungi because only their asexual stage is known. When the sexual stage is discovered, they are shifted to Ascomycetes or Basidiomycetes.
Question 16 of 300
📘 CLASS XI
Biological Classification
The protein coat of a virus is called a ________, which is made up of smaller subunits called ________.
The protein coat of a virus is the capsid, which consists of protein subunits called capsomeres.
Question 17 of 300
📘 CLASS XI
Biological Classification
Viroids were discovered by T.O. Diener and differ from viruses in that they:
Viroids are infectious RNA molecules without a protein coat and were discovered by T.O. Diener in 1971.
Question 18 of 300
📘 CLASS XI
Biological Classification
In a lichen, the fungal component is called the ________ and its primary role is to ________.
The fungal partner (mycobiont) provides shelter, water and minerals, whereas the algal partner (phycobiont) synthesises food.
Question 19 of 300
📘 CLASS XI
Biological Classification
Organisms that cause diseases such as sleeping sickness belong to which group of protozoans?
Trypanosoma, a flagellated protozoan, causes sleeping sickness.
Question 20 of 300
📘 CLASS XI
Biological Classification
Prions, which cause neurological diseases such as bovine spongiform encephalopathy (mad cow disease), are composed of:
Prions are infectious protein particles lacking nucleic acids and are responsible for diseases such as BSE and Creutzfeldt-Jakob disease.