Biological Classification

Select the wrong statement.

1. The walls of diatoms are easily destructible.
2. 'Diatomaceous earth' is formed by the cell walls of diatoms.
3. Diatoms are chief producers in the oceans.
4. Diatoms are microscopic and float passively in water.

Which one is a wrong statement?

1. Haploid endosperm is typical feature of Gymnosperms.
2. Brown algae have chlorophyll a and c and fucoxanthin.
3. Archegonia are found in Bryophyta, Pteridophyta and Gymnosperms.
4. Mucor has biflagellate zoospores.

Select the wrong statement.

1. The term ' contagium vivum fluidum' was coined by M. W. Beijerinck.
2. Mosaic disease in tobacco and AIDS in human being are caused by viruses.
3. The viroids were discovered by D.J. Ivanowsky.
4. W.M. Stanley showed that viruses could be crystallised.

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

1. Dinoflagellates
2. Slime moulds
3. Chrysophytes
4. Euglenoids

Pick up the wrong statement.

1. Some fungi are edible.
2. Nuclear membrane is present in Monera.
3. Cell wall is absent in Animalia.
4. Protists have photosynthetic and heterotrophic modes of nutrition.

Choose the wrong statement.

1. Morels and truffles are poisonous mushrooms.
2. Yeast is unicellular and useful in fermentation.
3. Penicillium is multicellular and produces antibiotics.
4. Neurospora is used in the study of bio-chemical genetics.

Cell wall is absent in

1. Mycoplasma
2. Nostoc
3. Aspergillus
4. Funaria.

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

1. Ascomycetes
2. Phycomycetes
3. Basidiomycetes
4. Deuteromycetes

True nucleus is absent in

1. Vaucheria
2. Volvox
3. Anabaena
4. Mucor.

Which one of the following matches is correct?

1. Mucor – Reproduction by conjugation – Ascomycetes
2. Agaricus – Parasitic fungus – Basidiomycetes
3. Phytophthora – Aseptate mycelium – Basidiomycetes
4. Alternaria – Sexual reproduction absent – Deuteromycetes