Q.

Read the following statements and select the option which identifies the incorrect one(s).(i) Witches broom disease are caused by viroids.(ii) Retroviruses have two copies of ssRNA.(iii) Dmitri Ivanowsky is related to Contagium vivum fluidum.

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a

i and iii only

b

i and ii only

c

ii and iii only

d

i, ii and iii

answer is A.

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Detailed Solution

Witches broom disease are caused by mycoplasma. M.W. Beijerinck is related to Contagium vivum fluidum. Retroviruses are usually have two copies of genome.
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