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UPSC CDS Environment & Ecology — practice questions — page 2

Explore 180 free Environment & Ecology questions in UPSC CDS Science. Open each question or exercise to read its content, reference answers and available explanation.

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Environment & Ecology questions and exercises with answers

Showing questions 31–60 of 180.

Milk is converted to curd by Lactobacillus and other:Read the answer and worked solution →Bread dough is fermented using the baker's yeast:Read the answer and worked solution →Toddy, a traditional drink of southern India, is made by fermenting:Read the answer and worked solution →The large holes in Swiss cheese are due to carbon dioxide produced by:Read the answer and worked solution →Wine and beer differ from whisky, brandy and rum because they are produced without:Read the answer and worked solution →Penicillin was named after the mould:Read the answer and worked solution →Penicillin's full potential as an antibiotic was established by Ernest Chain and:Read the answer and worked solution →Fleming, Chain and Florey received the Nobel Prize in:Read the answer and worked solution →Citric acid is produced commercially by the fungus:Read the answer and worked solution →Lipases in detergents help remove:Read the answer and worked solution →Streptokinase, used as a clot buster after heart attacks, is produced by:Read the answer and worked solution →Cyclosporin A, an immunosuppressant for transplant patients, comes from the fungus:Read the answer and worked solution →Statins that lower blood cholesterol are produced by the yeast:Read the answer and worked solution →In secondary sewage treatment, aerobic microbes grow into masses called:Read the answer and worked solution →The sediment of bacterial flocs from the settling tank is called:Read the answer and worked solution →Anaerobic sludge digesters produce a gas mixture of methane, carbon dioxide and:Read the answer and worked solution →Bacteria that produce methane while growing anaerobically on cellulose are called:Read the answer and worked solution →Biogas technology in India was developed mainly by IARI and:Read the answer and worked solution →Bacillus thuringiensis spores sprayed on brassicas kill:Read the answer and worked solution →Baculoviruses used in biocontrol mostly belong to the genus:Read the answer and worked solution →Rhizobium fixes atmospheric nitrogen in the root nodules of:Read the answer and worked solution →The mycorrhizal fungus Glomus absorbs which nutrient from soil for the plant?Read the answer and worked solution →Catch the biofertilisersRead the answer and worked solution →Pop the sewage treatment wordsRead the answer and worked solution →Run the microbe productsRead the answer and worked solution →Slice the microbe wordsRead the answer and worked solution →Bacterium or fungusRead the answer and worked solution →Sort where microbes serveRead the answer and worked solution →Type the numberRead the answer and worked solution →Microbes in welfare bingoRead the answer and worked solution →

Worked practice questions

Milk is converted to curd by Lactobacillus and other:

  1. Lactic acid bacteria
  2. Methane forming bacteria
  3. Blue green cyanobacteria
  4. Insect baculoviruses
Show answer and solution

Correct answer: A. Lactic acid bacteria

1. Their acids coagulate milk proteins. 2. Lactic acid bacteria make curd. 3. Curd also gains vitamin B12. _Source: syllabus Biology, Chapter 10, Microbes in Human Welfare._

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Bread dough is fermented using the baker's yeast:

  1. Trichoderma polysporum
  2. Saccharomyces cerevisiae
  3. Aspergillus niger
  4. Penicillium notatum
Show answer and solution

Correct answer: B. Saccharomyces cerevisiae

1. The same yeast is brewer's yeast. 2. Saccharomyces cerevisiae ferments the dough. 3. It also makes ethanol from malted cereals. _Source: syllabus Biology, Chapter 10, Microbes in Human Welfare._

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Toddy, a traditional drink of southern India, is made by fermenting:

  1. Palm sap
  2. Rice water
  3. Sugarcane
  4. Grape juice
Show answer and solution

Correct answer: A. Palm sap

1. Microbes ferment many traditional foods. 2. Toddy comes from palm sap. 3. Fish, soyabean and bamboo shoots are also fermented. _Source: syllabus Biology, Chapter 10, Microbes in Human Welfare._

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