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Biotechnolgy and microbes in human welfare Quiz-19

Dear Readers,

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. .

Q1.  Which of the following herbicides and defoliant were used by the US military in its herbicidal warfare programme during the Vietnam war?
  •   Agent black
  •   Agent orange
  •   Super orange
  •   Both (b) and (c)
Solution
Agent orange and super orange were used from 1961 to 1971. They released dioxins, which have caused harm to the health of those exposed during the Vietnam war. Agent blue and white were part of the same programme but did not contain dioxins.

Q2.  Which of the following insecticides is obtained from the roots of Derris elleptica ?
  •   Cinerin
  •   Nicotine
  •   Rotenone
  •   Pyrethrum
Solution
Rotenone is a natural insecticide, which is obtained from the root of Derris elleptica.

Q3.  In rice fields biological nitrogen fixation is chiefly brought by
  •   Lichen
  •   Brown algae
  •   Cyanobacteria
  •   Rhizobium
Solution
The most suitable source of biofertiliser is achieved by the use of blue-green algae (cyanobacteria), particularly in rice fields. These organisms grow well in symbiotic association with other plants or as free living individuals on the surface of moist soil or under water logged conditions

Q4.  Gobar gas contains mainly
  •   CH4and CO2
  •   CH4and O2
  •   CH4and H2
  •   CH4 and SO2
Solution
Biogas is a methane rich fuel gas produced by anaerobic breakdown or digestion of biomass (mainly animal wastes) with the help of mathanogenic bacteria. It is composed of methane (50-70%),CO2(30-40%) and traces of hydrogen, nitrogen and H2S

Q5. Which of the following shows maximum genetic diversity in India?
  •   Rice
  •   Maize
  •   Mango
  •   Groundnut
Solution
  There are an estimated 2,00,000 varieties of rice in India alone. The diversity of rice in India is one of the richest in the world. Basmati rice has 27 documented varieties grown in India.

Q6.  The large holes in swiss cheese are due to production of a large amount of …A… by a bacterium …B… . Here A and B refers to
  •   A-CO2; B-Penicillium roqueforti
  •   A-CO2; B-Propionibacterium sharmanii
  • A-CO2; B-Penicillium notatum
  •   A-CO2; B-Saccharomyces cerevisiae
Solution
A-CO2; B-Propionibacterium sharmanii
Swiss cheese is manufactured with a single strains of Propionibacterium shermanii and Propionibacterium arabinosum. Its characteristic feature is formation of large holes due to production of large amount of CO2


Q7. Study the following flow chart that shows curd formation from milk and select the correct option for A and B
Milk is incubated with curd ↓
LAB shows growth in milk ↓
Production of …..A….. ↓
Coagulation and digestion of milk protein ↓
Improved nutritional quality by increased ….B….
  •   A-citric acid; B-vitamin-B12
  •   A-lactic acid; B-vitamin-B12
  •   A-lactic acid; B-vitamin-C
  •   A-citric acid; B-vitamin-B2
Solution
Milk is incubated with curd
                ↓
Lab shows growth in milk 
                ↓
Production of lactic acid (A)
                ↓
Coagulation and digestion of milk protein 
                ↓
Improved nutritional quality by increased vitamin-B12 (B)


Q8. Indian rose wood tree is a common name of
  •   Acacia
  •   Shorea
  •   Delbergia
  •   Eucalyptus
Solution
Indian rose wood tree is sissoo, i.e., Delbergia sissoo.

Q9. Aleurone grains are rich in
  •   Fat
  •   Protein
  •   Carbohydrates
  •   Auxins
Solution
Aleurone grains are rich in proteins. Aleurone layer is the peripheral part of endosperm and is very important physiologically because it secretes or accumulates the hydrolysing enzymes, which help in digestion of reserve food material during digestion.

Q10.  Morphine is obtained from
  •   Rauwolffia serpentina
  •   Papaver somniferum
  •   Cannabis sativa
  • Cajanus cajan
Solution
Morphine is obtained from Papaver somniferum.

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