Microbes in Human Welfare Additional Practice Test

12th Standard Zoology — Microbes in Human Welfare: Additional Online Practice Test

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Which of the following refers to the non-digestible food compounds, such as fibers, that selectively stimulate the growth and activity of beneficial microorganisms in the digestive tract?

A.Probiotics B.Antibiotics C.Prebiotics D.Synbiotics

The characteristic flavor of yogurt, produced by the fermentation of milk using Streptococcus thermophilus and Lactobacillus bulgaricus, is primarily due to which compound?

A.Acetaldehyde B.Lactic acid C.Ethyl alcohol D.Acetic acid

Who discovered the antibiotic Streptomycin and was the first to introduce and use the term 'antibiotic' in the year 1943?

A.Alexander Fleming B.Selman Waksman C.Edward Jenner D.Louis Pasteur

What is the name of the applied science that specifically deals with the biochemical processes of fermentation and its practical, industrial applications?

A.Zymology B.Mycology C.Biotechnology D.Bacteriology

Which group of enzymes is commercially utilized to clarify bottled fruit juices by digesting structural plant cell wall components?

A.Lipases and amylases B.Proteases, pectinases, and cellulases C.Polymerases and ligases D.Dehydrogenases and isomerases

A patient who has recently undergone myocardial infarction requires a 'clot buster' to remove blockages in their blood vessels. Which bioactive molecule is used for this purpose?

A.Cyclosporin A B.Statins C.Streptokinase D.Citric acid

Under the National Policy on Biofuels approved by the Government of India in December 2009, which plant species was identified as the most suitable oilseed for biodiesel production?

A.Jatropha curcas B.Pongamia pinnata C.Ricinus communis D.Brassica campestris

Biogas is a mixture of gases produced by anaerobic microbial breakdown. What is the approximate percentage of methane, its primary combustible component, present in biogas?

A.50 percent B.63 percent C.75 percent D.45 percent

In a Microbial Fuel Cell (MFC), what is the primary role of the electrogenic bacteria residing at the anode chamber?

A.To reduce carbon dioxide into methane gas B.To oxidize organic molecules and generate protons and electrons C.To synthesize complex carbohydrates from light energy D.To act as a proton exchange membrane between chambers

Q10

What was the first genetically engineered living organism to be patented in the world, developed by the scientist Ananda Mohan Chakrabarty?

A.Saccharomyces cerevisiae B.Escherichia coli C.Pseudomonas putida D.Ideonella sakaiensis

Q11

Which of the following microorganisms is capable of degrading benzene under aerobic conditions, as well as a variety of halogenated organic compounds like trichloroethylene?

A.Nitrosomonas europaea B.Dechloromonas aromatica C.Dehalococcoides species D.Phanerochaete chrysosporium

Q12

The bacterium Ideonella sakaiensis is currently being investigated for recycling of PET plastics. Which enzymes does this bacterium use to break down PET?

A.Pectinase and cellulase B.PETase and MHETase C.Lipase and protease D.Amylase and zymase

Q13

Which of the following anaerobic microbes has the specific ability to degrade benzene in the absence of oxygen, as well as oxidize toluene and xylene?

A.Pseudomonas putida B.Dechloromonas aromatica C.Pestalotiopsis microspora D.Aspergillus niger

Q14

Which anaerobic fungus has shown strong potential for the bioremediation of toxic substances such as pesticides, polyaromatic hydrocarbons, trinitrotoluene, and cyanides?

A.Pestalotiopsis microspora B.Phanerochaete chrysosporium C.Trichoderma polysporum D.Saccharomyces cerevisiae

Q15

Which endophytic fungus has the unique capability of breaking down and digesting polyurethane, making it a promising candidate for bioremediating large quantities of plastics?

A.Ideonella sakaiensis B.Pestalotiopsis microspora C.Dehalococcoides species D.Rhizopus oryzae

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About this Microbes in Human Welfare test

This free online practice test covers Microbes in Human Welfare from the 12th Standard Zoology (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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