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Biotechnology and microbes in human welfare Quiz-4

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NEET is the most famous and important medical entrance examination held in our country. This exam is an objective type, an offline test which includes 4 sections namely– Physics, Chemistry, Botany, and Zoology. The maximum marks that can be scored are 720 marks and have 180 questions. About half of the paper consists of questions from Biology, as the NEET exam essentially focuses on capacitating students to go for seats in medical courses. One of the most significant and crucial sections in the NEET exam is of Biology. It comprises of theories, descriptions, discoveries, diagrams, definitions, explanations of differences, and relations. The majority of the topics covered in the NEET syllabus are from the NCERT syllabus of Class 11 & 12 and other related sources become part of the rest of the syllabus. Clear Exam curates a list of articles selected by professionals who recommend the highly vital topics for NEET exams. The table below takes you directly to the respective topic where the in-depth article and the MCQs are available for an easy and productive learning experience. Prior to solving NEET question papers or practicing mock tests, you must ensure to study the basic concepts in NEET and practice a few sample questions related to this exam. Students will be covered for all their studies as the topics are available from basics to even the most advanced..
are very important in achieving your success in CLAT, DULLB and Other Law Exams..

Q1. Consider the following statements about Bt
I. The bacteria Bacillus thuringiensis (Bt) are used to control butterfly catterpillers
II. Fresh spores of Bt are mixed with water and sprayed on seeds such as brassicas and fruit trees
III. Insect larvae, after eating these are killed by the toxin released in their gut
IV. Bt toxin genes have been introduced into plants to provide resistance to pests
Which of the statements given above are correct?
  •  I, II and III
  •  I, III and IV
  •  II, III and IV
  •  I, II, III and IV
Solution
c) All statements are correct Fresh spores of Bt are mixed with water and sprayed on plants such as brassicas and fruit trees

Q2.Baculoviruses do not show harmful effect on
I. plants II. Mammals
III. bird IV. Non-target insects
Choose the correct option
  •  I, III and III
  •  II, III and IV
  •  I, III and IV
  •  I, II, III and IV
Solution
d) All of these. Baculovirus heliothis (a group of virus) are known to infect the larval stages of many harmful insects beetles, wasps and ants. A number of baculovirus, which are used as biopesticides belongs to the genus Nucleopohyledro virus These biological weapons are not only effective as potential biological control of harmful insects, but are also harmless to non-target organisms insects (plants, birds, mammals, non-targets insects etc). They are important in organic farming because of their specific action on harmful insects without causing any damage to beneficial insects as well as to the environment. Baculoviruses are helpful in Integrated Pest Management (IPM) Programme, in which beneficial insects are conserved

Q3.  Gambusia fish is
  •  Cat fish
  •  Sucker fish
  •  Mosquito fish
  •  Flat fish
Solution
c) Gambusia (mosquito fish) feeds on mosquito larvae and is therefore, used as larvicidal.

Q4. Penicillin is the first antibiotic. It was discovered by
  •  Alexander Flemming : 1928
  •  Alexander Flemming : 1930
  •  S Waksman : 1928
  •  S Waksman : 1930
Solution
a) Penicillin was the first antibiotic to be discovered by Alexander Flemming (1928)

Q5.A water fern, which is used as a green manure in rice fields is
  •   Salvinia
  •   Mucor
  •  Aspergillus
  •  Azolla
Solution
d) Azolla is cultivated in rice fields as it provides both green compost and fixed nitrogen to the crop. The use of Azolla in rice fields at the rate of 200 gm per square metre area can increase rice yield by 12.38%. Eexperiments have revealed that application of 10 tonnes of fresh Azolla biomass in one hectare, adds as much as 100 kg nitrogen.

Q6. The pioneer country in the production of fuel-alcohol is
  •  Saudi Arabia
  •  Iran & Iraq
  •  Brazil
  •  Japan
Solution
c) Fuel alcohol (bioethanol) is produced from biomass by microorganisms. It is successfully used as motor fuel in Brazil and USA.

Q7.Baker’s yeast is
  • Propionibacterium sharmanii
  •  Saccharomyces cerevisiae
  •  Trichoderma polysporum
  •  Lactobacillus
Solution
b) Saccharomyces cerevisiae. Bread is made through fermentation by Saccharomyces cerevisiae or commonly called baker’s yeast. Yeast species also used in alcoholic fermentation is S. cerevisiae (Brewer's yeasts)
Q8. Green manures are prepared from
  • Saccharum officinarum
  •  Zea mays
  •  Crotalaria juncea
  •   Sorghum vulgare
Solution
(c) Green manure includes leguminous crops like Crotalaria juncea (sunnhemp), Sesbania aculeata (daincha), Cyamposis tetragonoloba (cluster bean), etc.

Q9. Which is a bioinsecticide?
  •  Cactoblastis cactorum
  •  Anabaena
  •  Bacillus thuringiensis
  •  Rhizobium
Solution
(c) Bacillus thurigiensis is a natural insecticide. It secretes a toxin protein thurisoide, which is effective against insects like moths, flies mosquitoes and beetles.

Q10.  A man made allopolyploid cereal crop is
  •  Hordeum vulgare
  •  Triticale
  •  Raphanobrassica
  •  Zea mays
Solution
(b) Allopolyploid means a mixture of two different genetic formsio. Intergeneric hybridization of cereal crops. Triticale is first man made allopolyploid cereal crop.

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Biotechnology and microbes in human welfare Quiz-4
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