Biofertilizers And Antibiotics Test
Biofertilizers And Antibiotics
This is online test 01 for CBSE class 12 Biology Microbes in Human Welfare (Biofertilizers and antibiotics).. There are 10 questions in this test with each question having around four answer choices.
Questions & Answers
1
The chemical substances produced by some microbes and can kill or retard the growth of disease causing microbes are called
- AAll of these
- BAntibodies
- CAntibioticsCorrect
- DAntigens
2
Use of biocontrol measures will greatly reduce our dependence on
- AFertilizers and manure
- BUseful chemicals and pesticides
- CPlants and insects
- DToxic chemicals and pesticidesCorrect
3
Which of the following is a gram-negative bacterium?
- AStreptomyces coelicolor
- BBacillus subtilis
- CEscherichia coliCorrect
- DAmycolatopsis orientali
4
The common nitrogen-fixer in paddy fields is
- AFrankia
- BAzospirillumCorrect
- COscillatoria
- DRhizobium
5
The most important of the symbiotic nitrogen fixing bacteria which forms nodules on the roots of legume plants is
- APenicillium
- BRhizobiumCorrect
- CAspergillus
- DStreptococcus
6
The term antibiotic was coined by
- ASelman WaksmanCorrect
- BHoward Florey
- CGerhard Domagk
- DJohn Tyndall
7
Which of the following organisms not fix atmospheric nitrogen
- ASpirogyraCorrect
- BAnabaena
- COscillatoria
- DNostoc
8
Cyanobacteria serves as important biofertilizers in the fields of
- ARiceCorrect
- BSugarcane
- CMaize
- DWheat
9
Fleming, Chain and Florey were awarded the Nobel Prize in 1945 for discovery of
- AAntibioticCorrect
- BNone of these
- CInsulin
- DAntibodies
10
A nitrogen fixing microbe associated with Azolla in rice fields is
- ATolypothrix
- BAnabaenaCorrect
- CSpirulina
- DFrankia