CBSE Questions for Class 11 Medical Biology Biological Classification Quiz 14 - MCQExams.com

• Capsid is the protein shell of a virus. It is also known as the envelope of a virus. It is made up of protomers.
•  It encloses the genetic material of a virus and protects it from the environment. 
• It also contains special sites on its surface which allow its attachment to a host cell. 

Lichens are a symbiotic partnership of fungus and algae. The dominant partner is the fungus, which gives the lichen the majority of its characteristics from its thallus shape to its fruiting bodies. So, thallus is foliose in lichens. Lichens occur in one of four basic growth forms. crustose, squamulose, foliose and fruticose. So, the correct answer is 'Lichens'.

• Plasmogamy is a stage in the sexual reproduction of fungi, in which the cytoplasm of two-parent cells (usually from the mycelia) fuses together without the fusion of nuclei, effectively bringing two haploid nuclei to close together in the same cell. 

• Natural System - These systems the plants were classified on the basis of their natural affinities (i.e. the basic similarities in the morphology) rather than on a character for determining the affinities. 
• Compared to the artificial systems, it was based on the proper utilization of all facts and figures available in nature. 
• In this system, the plants were grouped and placed into different taxa like classes, orders, families, and genera. Michel Adanson was the first scientist to reject all the artificial systems and support the natural systems of classification. 
• The main demerit of this system was that the classification was not based on evolutionary relationships. 
• Different families had been placed in specific groups which do not show any evolutionary relationships.

• A virion is an infectious form of the virus. It contains genetic material (DNA or RNA) surrounded by the protein coat known as the capsid.
• Viruses do not have nuclei or any other cellular organelles.
• It is a functional virus that has the capacity to infect living tissue. 
• Viroids are infectious RNA molecules without protein coats. 
• A prion is an infectious abnormally folded protein found in the brain that can lead to many neurodegenerative disorders.
  

(A) In Pycomycetes, the mycelium does not show the inner septation. There are no cross walls and nuclei are present in the common cytoplasm. Such a mycelium is called the coenocyte. They form asexual spores called zoospores.

(B) Basidiomycetes do not usually show the asexual reproduction. They reproduce sexually through the spores called basidia.

(C) Mycelium of Ascomycetes is branched and septate. They form asexual spores called conidia. Hence, the correct answer is (A)-T, (B)-F, (C)-T

• Kingdom Fungi constitutes a bunch of heterotrophic organisms.  The organisms opt to grow in heat and wet places. 
• All organisms of the fungus kingdom don't seem to be unicellular. They are largely multicellular with an exception.
•  Yeast could be a fungus that's unicellular. Hence, all organisms of the kingdom fungi are not multicellular.

Anabaena is a filamentous true cyanobacterium that has nitrogen-fixing capabilities. It is a member of kingdom Monera. So, the correct answer is 'Monera'.

• Mycorrhiza is the product formed by the symbiotic association between fungus and roots of higher plants, in which fungi protects the plant from pathogens and increases the surface area by which plants can absorb soil nutrients and water whereas plants provide the shelter and carbohydrates to fungi in which both get benefited.

A.Hypha – a filament of mycelium is called hypha.

B.mycelium – a network of filamentous structure that forms the body of fungus is called mycelium.

C.Rhizoid -  root like hyphae appear in some fungi are called rhizoids.

D.Fruiting body – specialised structure formed after fertilizaiton in ascomyetis and basidiomycetis fungi is called fruiting body. It is made up of secondary mycelium.