XI BIO -BOTANY LN -1 Q-2

____________ are sub-microscopic, obligate intracellular parasites.

• Bacteria

• Viruses

• Protozoa

• Fungi

____________- defined the infectious agent in tobacco leaves as ῾Contagium vivum fluidum

• F.W.Twort

• M.W. Beijierink

• d’Herelle

• Dimitry Ivanowsky

Adenovirus, Herpes virus are example of ________ symmetry

• Helical

• Cuboid

• Complex

• Atypical

Cauliflower Mosaic virus possess ____

• DNA

• RNA

• DNA and RNA

• both b and c

In bacteriophage , The head is hexagonal which consists of about ________ identical protein subunits

• 20000

• 200

• 2000

• 20

The empty protein coat leaving outside the cell is known as _______.

• outer cell

• ghost

• host

• outer coat

After _______________ of infection about 300 new phages are assembled.

• 40 minutes

• 30 minutes

• 20 minutes

• 10 minutes

_____________ is an intact infective virus particle which is non-replicating outside a host cell.

• virus

• Virion

• Viroid

• Virusoids

Pick out the animal diseases___

• Foot and mouth disease

• Sugarcane mosaic

• Potato leaf roll

• Cauliflower mosaic

Pick out the animal disease

• Common cold

• Hepatitis B

• Cancer

• Rabies