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UPSC CDS Agriculture — practice questions — page 3

Explore 150 free Agriculture questions in UPSC CDS Science. Open each question or exercise to read its content, reference answers and available explanation.

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Agriculture questions and exercises with answers

Showing questions 61–90 of 150.

Microorganisms are classified into four major groups: bacteria, fungi, protozoa and some:Read the answer and worked solution →Viruses differ from other microbes because they reproduce only:Read the answer and worked solution →Polio and chicken pox are caused by:Read the answer and worked solution →A patient has dysentery. Which group of microorganisms causes it, as it does malaria?Read the answer and worked solution →The bacterium that turns milk into curd is:Read the answer and worked solution →Bread dough rises because yeast produces which gas during respiration?Read the answer and worked solution →The conversion of sugar into alcohol by yeast is called:Read the answer and worked solution →Who discovered fermentation in 1857?Read the answer and worked solution →In 1929, Alexander Fleming found a green mould killing bacteria, leading to which antibiotic?Read the answer and worked solution →Antibiotics are not effective against cold and flu because these are caused by:Read the answer and worked solution →Edward Jenner discovered the vaccine for smallpox in:Read the answer and worked solution →When dead or weakened microbes are introduced into the body, the body produces:Read the answer and worked solution →Polio drops given to children under the Pulse Polio Programme are actually a:Read the answer and worked solution →Bacteria and blue green algae that enrich soil with nitrogen from the air are called:Read the answer and worked solution →Disease-causing microorganisms are called:Read the answer and worked solution →The malaria parasite Plasmodium is carried by which mosquito?Read the answer and worked solution →Dengue virus is carried by the female:Read the answer and worked solution →Robert Koch in 1876 discovered the bacterium causing:Read the answer and worked solution →Sodium benzoate and sodium metabisulphite used in jams and squashes are:Read the answer and worked solution →In pasteurisation, milk is heated to about 70 degrees Celsius for how long before sudden chilling?Read the answer and worked solution →Rhizobium fixes nitrogen while living in the root nodules of:Read the answer and worked solution →Our atmosphere contains about what share of nitrogen gas?Read the answer and worked solution →Catch the viral diseasesRead the answer and worked solution →Pop the food preserversRead the answer and worked solution →Run the microbe milestonesRead the answer and worked solution →Slice the microbe wordsRead the answer and worked solution →Friend or foeRead the answer and worked solution →Sort the disease causesRead the answer and worked solution →Type the numberRead the answer and worked solution →Microorganisms bingoRead the answer and worked solution →

Worked practice questions

Microorganisms are classified into four major groups: bacteria, fungi, protozoa and some:

  1. Algae
  2. Viruses
  3. Worms
  4. Insects
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Correct answer: A. Algae

1. Viruses are microscopic but treated separately. 2. Some algae form the fourth group. 3. Bread mould is a fungus. _Source: syllabus Science, Chapter 2, Microorganisms: Friend and Foe._

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Viruses differ from other microbes because they reproduce only:

  1. Under bright light
  2. Inside host cells
  3. In open sea water
  4. In dry desert soil
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Correct answer: B. Inside host cells

1. The host may be a bacterium, plant or animal. 2. Viruses reproduce only inside host cells. 3. Cold, flu and polio are viral. _Source: syllabus Science, Chapter 2, Microorganisms: Friend and Foe._

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Polio and chicken pox are caused by:

  1. Viruses
  2. Bacteria
  3. Protozoa
  4. Moulds
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Correct answer: A. Viruses

1. Common cold and flu are also viral. 2. Polio and chicken pox are serious viral diseases. 3. Vaccines prevent them. _Source: syllabus Science, Chapter 2, Microorganisms: Friend and Foe._

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