Virus envelope is known as

  • capsid

  • virion

  • nucleoprotein

  • core

 

Some hyperthermophilic organisms that grow in highly acidic (pH2) habitats belong to the two groups called

  • eubacteria and archaea

  • cyanobacteria and diatoms

  • protists and mosses

  • liverworts and yeasts

Infectious proteins are present in

  • gemini viruses

  • prions

  • viroids

  • satellite viruses

Oxygenic photosynthesis occurs in

  • Chromatium

  • Oscillatoria

  • Rhodospirillum

  • Chlorobium

T. O. Diener discovered a

  • free infectious RNA

  • free infectious DNA

  • infectious protein

  • bacteriophage

Bacterial leaf blight of rice is caused by a species of

  • Xanthomonas

  • Pseudomonas

  • Alternaria

  • Erwinia

In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statement is true about archaea?

  • Archaea resemble eukarya in all respects

  • Archaea have some novel features that are absent in other prokaryotes and eukaryotes

  • Archaea completely differ from both prokaryotes and eukaryotes

  • Archaea completely differ from prokaryotes

Which of the following is a slime mould?

  • Rhizopus

  • Physarum

  • Thiobacillus

  • Anabaena

Which of the following shows coiled RNA strand and capsomeres?

  • Polio virus

  • Tobacco mosaic virus

  • Measles virus

  • Retrovirus

Viruses have

  • DNA enclosed in a protein coat

  • prokaryotic nucleus

  • single chromosome

  • Both DNA and RNA

Cellulose is the major component of cell walls of

  • Pythium

  • Xanthomonas

  • Pseudomonas

  • Saccharomyces

Which of the following components provides sticky character to the bacterial cell?

  • Cell wall

  • Nuclear membrane

  • Plasma membrane

  • Glycocalyx

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

  • Deuteromycetes

  • Basidiomycetes

  • Phycomycetes

  • Ascomycetes

Select wrong statement.

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

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

  • The term 'contagium vivum fluidum' was coined by M.W. Beijerinek.

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

Choose the wrong statement.

  •  Penicillium is multicellular and produces antibiotics.

  •  Neurospora is used in the study of biochemical genetics.

  • Morels and truffles are poisonous mushrooms.

  • Yeast is unicellular and useful in fermentation.

The structures that help some bacteria to attach to rocks and/or host tissues are

  • rhizoids

  • fimbriae

  • mesosomes

  • holdfast

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

together?

  • Chrysophytes

  • Euglenoids

  • Dinoflagellates

  • Slime moulds

Pick up the wrong statement.

  • Cell wall is absent in Animalia.

  • Protista have photosynthetic and heterotrophic modes of nutrition.

  • Some fungi are edible.

  • Nuclear membrane is present in Monera.

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

  • Archaebacteria

  • Eubacteria

  • Blue-green algae

  • Saprophytic fungi

The rod shaped cells of Bacillus megatarium are converted to spherical units called protoplasts on treatment with the enzyme

  • lysozyme

  • cellulase

  • cellulase and hemicellulase

  • cellulase, hemicellulase and pectinase

The characteristic features of the mycoplasma are that

  • they are much smaller than bacteria in size

  • they can be grown on cell free medium

  • they are highly pleomorphic and are bounded by a triple layered unit membrane

  • all of the above

The kingdom protista does  not include

  • photosynthetic organisms

  • flagellate organisms

  • parasitic organisms

  • bacteria

A lichen that grows by branching is described as 

  • fruticose

  • crustose

  • foliose

  • dichotose

The fruiting bodies of Agaricus are also known as

  • cleistothecium

  • fairy rings

  • basidiocarp

  • ascocarp

Fungi imperfecti constitute a group that

  • are obligatory parasites

  • reproduce only asexually

  • do not cause disease in humans

  • resemble bacteria in some respects

Which is purely anaerobic?

  • Algae

  • Mosses

  • Fungi

  • None of these

Which of these contains 2 nucleus one for vegetative purpose and the other for reproduction?

  • Euglena

  • Paramecium

  • Chlamydomonas

  • Spirogyra

Viral envelope contains

  • lipids

  • proteins

  • carbohydrates

  • all of these

Which of the following is a DNA containing double shelled virus?

  • Hepatitis A

  • Hepatitis B

  • Hepatitis C

  • Hepatitis D

Azolla increases soil fertility of

  • maize

  • barley

  • rice

  • wheat

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Practice Botany Quiz Questions and Answers