Q. No.Two plants can be conclusively said to belong to the same species if they:
(1) can reproduce freely with each other and form viable seeds
(2) have more than 90 percent similar genes
(3) look similar and possess identical secondary metabolites
(4) have same number of chromosomes
Difficulty Level:
True nucleus is absent in
(1) Anabaena
(2) Mucor
(3) Vaucheria
(4) Volvox
Difficulty Level:
Cell wall is absent in
(1) Aspergillus
(2) Funaria
(3) Mycoplasma
(4) Nostoc
Difficulty Level:
Which of the following shows coiled RNA strand and capsomeres?
(1) Polio virus
(2) Tobacco mosaic virus
(3) Measles virus
(4) Retrovirus
Difficulty Level:
Viruses have
(1) DNA enclosed in a protein coat
(2) prokaryotic nucleus
(3) single chromosome
(4) Both DNA and RNA
Difficulty Level:
Cellulose is the major component of cell walls of
(1) Pythium
(2) Xanthomonas
(3) Pseudomonas
(4) Saccharomyces
Difficulty Level:
The imperfect fungi which are decomposers of litter and help in mineral cycling belong to
(1) Deuteromycetes
(2) Basidiomycetes
(3) Phycomycetes
(4) Ascomycetes
Difficulty Level:
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. Beijerinek.
(4) Mosaic disease in tobacco and AIDS in human being are caused by viruses.
Difficulty Level:
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.
Difficulty Level:
The structures that help some bacteria to attach to rocks and/or host tissues are
1. rhizoids
2. fimbriae
3. mesosomes
4. holdfast
Difficulty Level:
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