Viruses have

1. DNA enclosed in a protein coat

2. prokaryotic nucleus

3. single chromosome

4. Both DNA and RNA

The imperfect fungi which are decomposers of litter and help in mineral cycling belong to

1. Deuteromycetes

2. Basidiomycetes

3. Phycomycetes

4. Ascomycetes

Select wrong statement.

1. The viroids were discovered by D.J. lvanowsky.

2. W.M. Stanley showed that viruses could be crystallized.

3. The term 'contagium vivum fluidum' was coined by M.W. Beijerinck.

4. Mosaic disease in tobacco and AIDS in human being are caused by viruses.

Choose the wrong statement.

1. Penicillium is multicellular and produces antibiotics.

2. Neurospora is used in the study of biochemical genetics.

3. Morels and truffles are poisonous mushrooms.

4. Yeast is unicellular and useful in fermentation.

In which group of organisms the cell walls form two thin overlapping shells which fit

together?

1. Chrysophytes

2. Euglenoids

3. Dinoflagellates

4. Slime moulds

Pick up the wrong statement.

Which of the following are likely to be present in deep sea water ?

1. Archaebacteria

2. Eubacteria

3. Blue-green algae

4. Saprophytic fungi

The kingdom protista does  not include

1. photosynthetic organisms

2. flagellate organisms

3. parasitic organisms

4. bacteria

The fruiting bodies of Agaricus are also known as

1. cleistothecium

2. fairy rings

3. basidiocarp

4. ascocarp

Fungi imperfecti constitute a group that

1. are obligatory parasites

2. reproduce only asexually

3. do not cause disease in humans

4. resemble bacteria in some respects