Viroids have

• single stranded RNA not enclosed by protein coat

• single stranded DNA not enclosed by protein coat

• double stranded DNA enclosed by protein coat

• double stranded RNA enclosed by protein coat

How many sub-phyla are available in Tracheata, according to Tippo's classification of kingdom Plantae ?

• 4

• 6

• 8

• 10

The usage of binomial names, for plant species, was accepted by all after the publication of the works by :

• Hooker

• Linnaeus

• Bentham

• Darwin

Which of the following statement about viruses is correct ?

• Viruses are obligate parasites

• Viruses contain both RNA and DNA

• Nucleic acid of viruses is known as capsid

• Viruses possess their own metabolic system

The virus, that infects bacteria, are made up of:

• Protein only

• RNA and protein

• DNA and lipid

• DNA and protein

The cell organelles are found in

• bacterial cells

• cyanobacterial cells

• prokaryotic cells

• eukaryotic cells

Intracellular compartments are not found in the cells of

• lower plants

• prokaryotes

• higher plants

• eukaryotes

Which one of the following is also called halophiles

• Eubacteria

• Actinomycetes

• Archaebacteria

• Cyanobacteria

In which book, Bentham and Hooker proposed their classification?

• Genera Plantarum

• Species Plantarum

• Historia Plantarum

• Historia Naturae

Name one disease of mulberry silkworm caused by Protozoa

• pebrine

• graseri

• flacheri

• muscardine