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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 one is incorrect for the effects of deforestation?
  •  It leads to soil erosion
  •  It alters the weather pattern by decreasing rainfall
  •  It speeds up nutrient recycling
  •  It destroys natural habitats of wildlife
Solution
Deforestation can have many impacts including increase rates of soil erosion decrease levels of rainfall and destroys natural habitats of wildlife

Q2. Why CNG is considered as good fuel over diesel/petrol?
I. CNG burns most efficiently without leaving any unburnt remnant behind
II. CNG is cheaper than petrol or diesel
III. CNG cannot be siphoned off by thieves and adulterated like petrol or diesel
Which of the statements given above are correct?
  •  I and II
  •  I and III
  •  II and III
  •  I,II and III
Solution
Compressed natural gas is a better fuel than petrol or diesel because it is (i) Cheaper (ii) Burns more efficiently (iii) Does not produce much pollution (iv) Cannot of siphoned off by thieves (v) Cannot be adulterated like petrol and diesel

Q3. Sulphur dioxide causes
  •  Asthma
  •  Bronchitis
  •  Emphysema
  •  All of these
Solution
Sulphur dioxide causes respiratory tract diseases like asthma, bronchitis, cancer, emphysema, etc.

Q4. If a pond food chain gets polluted by DDT, the tissue concentration of DDT would be highest in
  •  Acquatic weed
  •  Herbivorous fish
  •  Carnivorous fish
  •  Bird feeding on fish
Solution
Toxic substances cannot be metabolised or excreted therefore, they get accumulated in an organism and passed onto higher trophic levels. So, if a pond food chain gets polluted by DDT, the tissue concentration of DDT would be highest in bird feeding on fish

Q5. Desertification
I. conversion of former moist and fertile land into arid desert area
II. is a product of soil erosion
III. desertified area cannot be put to any use
Which of the statements given above are correct?
  •  I and II
  •  I and III
  •  II and III
  •  I,II and III
Solution
Desertification is a type of land degradation in which, a relatively dry land region becomes increasingly arid, typically losing its bodies of water as well as vegetation and wildlife. Desertified area cannot be put to any use. The main cause of desertification is overgrazing, others being soil erosion and deforestation

Q6. Restoring a forest cover over an area where one existed earlier but was removed at some point of time in the past is called
  •  Reforestation
  •  Afforestation
  •  Deforestation
  •  None of these
Solution
Reforestation is the natural or intentional restocking of existing forests and woodlands that have been depleted, usually through deforestation

Q7. Rain is called acid rain when its pH is below
  •  7
  •  6.5
  •  6
  •  5.6
Solution
Acid rain results from air pollution by oxides of nitrogen (NOx) and sulpaur (SOx). These gases react with water and form acids.
SO2+H2O->H2SO3
SO3+H2O->H2SO4
N2O5+H2O->2HNO3
When the pH of rain is below 5.6, it is called acid rain.


Q8. The pollutants which are already present in nature, but are released in substantial amounts by man are known as
  •  Qualitative pollutants
  •  Degradable pollutants
  •  Primary pollutants
  •  Quantitative pollutants
Solution
Quantitative pollutants are those substances which are already present in the environment, but are termed as pollutants when their concentration (quantity) increase in the environment, e.g.,CO2 is present on the environment in greater quality than normal.

Q9. Ozone depletion is occurring widely in
  •  Ionosphere
  •  stratosphere
  •  Both (a) and (b)
  •  Troposphere
Solution
Ozone depletion is occurring widely in the strotasphere, the depletion is particularly marked over the Antarctic region. This has resulted in formation of a large area of thinned ozone layer, commonly called as ozone hole

Q10. Which element is caused of itai-itai disease?
  •  Hg
  •  Pb
  •  Cd
  •  As
Solution
Cadmium (Cd) poisoning leads to itai-itai (ouch-ouch) disease. Cadmium consumption causes diarrhea, bone deformation, kindly damage, retarded growth, CNS injury etc.
Mercury (Hg) poisoning causes Minamata disease, lead (Pb) consumption cause damage to liver, heat, kidney and reduction haemoglobin formation, while black-foot disease is caused by chronic exposure to arsenic.

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