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. Escherichia coli is used as an indicator organism to determine pollution of water with
  •  Industrial effluents
  •  Pollen of aquatic plants
  •  Heavy metals
  •  Faecal matter
E.coli resides in the large intestine of human. Therefore, if these are present in water supply, it can be guessed that water supply has been contaminated by sewage.

Q2. Choose the correct statement regarding the catalytic converters
  •  Motor vehicles equipped with catalytic converter should use leaded petrol
  •  Catalytic converters have expensive metals namely platinum-palladium and rhodium as catalyst
  •  Catalytic converters help in reducing particulate matter
  •  As the exhaust passes through the catalytic converter nitrogen gas is covered to nitric oxide
Catalytic converters are filled into automobiles for reducing emission of poisonous gases like and CO. They have expensive metals like platinum-palladium and rhodium as catalyst. As the exhaust emission passes through catalytic converter, nitric oxide splits into nitrogen and oxygen; carbon monoxide is oxidised to carbon dioxide and unburnt hydrocarbons get burnt completely into and . Motor vehicles filled with catalytic converter should use unleaded petrol as leaded petrol inactivates the catalyst

Q3. Effect of pollution is observed first on
  •  Microorganisms
  •  Food crop
  •  Green vegetation
  •  Herbivores
Effect of pollution is observed first on green vegetation.

Q4. Which of the following problem is not created by noise pollution?
  •  Silicosis
  •  Hypertension
  •  Sleeplessness
  •  Deafness
Prolonged and continuous high intensity noise not only causes partial hearing loss but may cause a permanent loss of hearing. A sudden loud noise such as an explosion can damage the tympanic membrane. Noise also causes sleeplessness, increased heart beating, altered breathing pattern, thus considerably stressing humans. Silicosis and asbestosis are the common occupational lung disease. These diseases are caused due to chronic exposure of silica and asbestos death

Q5. High level radioactive waste can be managed in which of the following ways?
  •  Open dumping
  •  Composting
  •  Incineration
  •  Dumping in sealed containers
Nuclear waste should be pre-treated and stored in shielded containers and then buried about 500 m deep with in rocks

Q6. One of the following acts as secondary pollutant
  •  Br2
  •  Cl2
  •  NO2
  •  HNO3
Primary pollutants are the pollutants which enter the air directly from the source, e.g., etc. Secondary pollutants develop from the interaction of primary pollutants and atmosphere constituents, e.g., oxides of nitrogen react with atmospheric moisture (water vapour) and from HNO3 which results in acid rain.

Q7. Organic farming is the technique of raising crops through the use of
  •  Manure
  •  Biofertilizers
  •  Resistant varieties
  •  All of these
Organic farming is a form of agriculture that relies on techniques such as crop rotation, green manure, compost, resistant varieties and biologicals pest control

Q8. Biochemical Oxygen Demand (BOD) in a river water
  •  Remains unchanged when algal bloom occurs
  •  Has no relationship with concentration of oxygen in the water
  •  Gives a measure of Salmonella in the water
  •  Increase when sewage gets mixed with river water
Biochemical Oxygen Demand (BOD) is the amount of oxygen used for biochemical oxidation by microorganisms in a unit volume of water. Polluted water has high BOD. Thus when sewage gets mixed with river water, BOD will increase.

Q9. In 1984, the Bhopal gas tragedy took place because methyl isocyanate
  •  Reacted with DDT
  •  Reacted with NH3
  •  Reacted with CO2
  •  Reacted with H2O
Bhopal gas tragedy occurred (3 Dec, 1984) when MIC (Methyl Isocyanate) reacted with water in tank, an exothermic chemical reaction started and producing a lot of heat. As a result, the safety valve of tank burst because of increasing in pressure. It gave rise to a heavy gas leak which rapidly rank to the ground.

Q10. Excess atmospheric CO2 increase green house effect as CO2
  •  Precipitates dust in the atmosphere
  •  Reduces atmospheric pressure
  •  Is opaque to infra red rays
  •  Is not opaque to infra red rays
CO2 is opaque to infra-red rays, which allow entry of radiations in atmosphere but prevents return of heat to space from earth.

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