18662.Which of the following is a gram-negative bacterium?
Escherichia coli
Bacillus subtilis
Streptomyces coelicolor
Amycolatopsis orientalis
18663.Study the following lists:
The correct match is:
| List - I | List - II | ||
|---|---|---|---|
| (A) | Usage of bisexual flowers as female parents | (I) | Clonal selection |
| (B) | Incorporation of several desirable characters into a single variety | (II) | Pure line selection |
| (C) | Exploiting hybrid vigour for many generations | (III) | Emasculation |
| (D) | Improving local varieties of self pollinated crop | (IV) | Hybridization |
| (V) | Polyploidy breeding | ||
The correct match is:
A - IV, B - V, C - III, D - I
A - II, B - III, C - IV, D - V
A - III, B - IV, C - I, D - II
A - I, B - V, C - II, D - IV
18665.Which of the following is added to milk to curdle it or produce fermented milk products?
Azotobacter
Lactobacillus
Rhizobium
Clostridium
18666.Physical removal of large and small from the sewage through filtration and sedimentation is called:
Primary treatment
Secondary treatment
Tertiary treatment
Quaternary treatment
18667.Which of the following will begin fixing nitrogen only after they stop reproducing?
Penicillium
Rhizobium
Aspergillus
Streptococcus
18668.Which of the followings is also called sac fungi that live parasitically and in various habitats?
Basidiomycetes
Zygomycetes
Ascomycetes
Basidiomycetes
18669.Pollution from animal excreta and organic waste from kitchen can be most profitably minimized by
Storing them in underground storage tanks
Using them for producing biogas.
Vermiculture
Using them directly as biofertilizers.
18670.The most important of the symbiotic nitrogen fixing bacteria which forms nodules on the roots of legume plants is
Aspergillus
Rhizobium
Penicillium
Streptococcus
18671.The most common fungal partners of mycorrhiza are ______ species.
Azotobacter
Glomus
Azolla
Frankia
18672.Human insulin is being commercially produced from a transgenic species of
Saccharomyces
Escherichia
Mycobacterium
Rhizobium
18674.A patient brought to a hospital with myocardial infarction is normally immediately given
Cyclosporin–A
Statins
Penicillin
Streptokinase
18675.The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones categorized as
Chemosynthetic autotrophs
Heterotrophic bacteria
Cyanobacteria
Archaebacteria
18676.A nitrogen fixing microbe associated with Azolla in rice fields is
Frankia
Tolypothrix
Spirulina
Anabaena
18677.Genetic diversity in agricultural crops is threatened by:
Introduction of high yielding varieties
Intensive use of fertilizers
Extensive intercropping
Intensive use of biopesticides
18678.Two microbes found to be very useful in genetic engineering are
Diplococcus sp. and Pseudomonas sp.
Vibrio cholerae and a tailed bacteriophage
Escherichia coli and Agrobacterium tumefaciens
Crown gall bacterium and Caenorhabditis elegans
18679.Azolla is used as a biofertilizer because it
Has association of nitrogen fixing Cyanobacteria
Has association of nitrogen fixing Rhizobium
Multiplies very fast to produce massive biomass
Has association of mycorrhiza