Viruses, Viroids, Prions and Lichenes
Viruses, Viroids, Prions and Lichenes: Overview
This topic provides knowledge of viruses, viroids, prions, and lichens. It describes their morphological configuration and distinctive functions with the help of labelled visual contents. We will also study the difference between virus and viroids.
Important Questions on Viruses, Viroids, Prions and Lichenes
Viroids have
Tobacco mosaic virus is a tubular filament of size
Which one of the following statements about viruses is correct?
Enzymes are absent in
Mycorrhiza is
Which one of the following is not true about lichens?
Interferons are –
Virus envelope is known as -
Lichens are well known combination of an alga and a fungus where fungus has –
Lichens indicate SO2 pollution because they –
Tobacco Mosaic Virus (TMV) genes are -
In lichen, the fungal partner take part in sexual reproduction.
Fill in the blank with the correct answer from the bracket.
Asexual reproduction in lichen takes place by _____. (sporangiospores, conidia, pycnidiospores)
Soredia help in gaseous exchange in lichens.
Which of the following structure help in vegetative propagation in lichen?
The thallus of Usnea is firmly attached to the substratum and difficult to separate.
Write a note on fruticose lichen.
Graphis is a genus of lichen that possesses leaf-like thallus.
Which of the following is the characteristic of foliose lichen?
Parmelia possesses erect, shrubby thallus.
