Multiple Choice QuestionsPhylogenetic system of classification is based on
evolutionary relationships
morphological features
chemical constituents
chemical constituents
T O Diener discovered a
free infectious RNA
free infectious DNA,
infectious protein
infectious protein
A.
free infectious RNA
Viroids are small, circular, single-stranded RNA molecules that are the smallest known pathogens.The extracellular form of the viroid is naked RNA, ie, there is no protein capsid of any kind. Even, the RNA molecule contains no protein encoding genes and therefore, the viroid is totally dependent on host function for its replication. No viroid diseases of animals are known and the precise mechanisms by which viroids cause plant diseases remain unclear.
Peripatus is a connecting link between
Ctenophora and Platyhelminthes
Mollusca and Echinodermata
Annelida and Arthropoda
Annelida and Arthropoda
Trichoderma harzianum has proved a useful microorganism for
bioremediation of contaminated soils
reclamation of wastelands
gene transfer in higher plants
gene transfer in higher plants
Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?
Bacterial leaf blight of rice
Downy mildew of grapes
Loose smut of wheat
Loose smut of wheat
Thorn of Bougainvillea and tendril of Cucurbita are examples of
analogous organs
homologous organs
vestigial organs
vestigial organs
In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statement is true about archaea?
Archaea resemble eukarya in all respects
Archaea have some novel features that are absent in other prokaryotes and eukaryotes
Archaea completely differ from both prokaryotes and eukaryotes
Archaea completely differ from both prokaryotes and eukaryotes
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