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. One of the main reasons of soil erosion in India is
  •  Jhum cultivation
  •  Deforestation
  •  Drought conditions
  •  Temperature
Deforestation is the removal of a forest or stand of trees where the land is thereafter converted to a non-forest use. Examples of deforestation include conversion of forest land to farms, ranches or urban use

Q2. One green house gas contributes 14% to total global warming and another contributes 6%. There are respectively identified as
  •  N2O^CO2
  •  CFCs^N2O
  •  CH4^CO2
  •  CH4^CFCs

Q3. Addition of phosphate and nitrates/fertiliser into water and that water ultimately draining into lake firstly affects
  •  Growth of aquatic organisms in lake
  •  Eutrophication of lake
  •  The environment of lake
  •  Organic remains deposited on the lake bottom
Addition of phosphate of nitrate in water or lake firstly affect the growth of organisms. Large algae in presence of nitrate and phosphate growsery fast and occupy a large area As the overload of aquatic organisms increase, the organic remain start depauted at the bottom of lake and over centuary pile up the lake and ultimately converting into land. So eutrophication is natural ageing of lake by nutrient enrichment of its water

Q4. Which one of the following pairs of gases are the major cause of ‘Green house effect’?
  •  CO2^O
  •  CFCs^SO2
  •  CO2^N2O
  •  CO2^O3
The phenomenon of keeping the earth warm due to presence of certain gases in the atmosphere is called green house effect (Fourier,1827).The name is based after a similar warmer interior in glass-enclosed green house where glass panes, CO2 and water vapour allow the solar radiations to enter but prevent the escape of long wave heat radiations CO2 and NO2 are the major cause of “green house effect” CO2 contributes 60% of total global warming , NO2 contributes 6% to green effect.

Q5. Given diagram represents the greenhouse effect

I. Greenhouse gases absorb infrared radiation from the earth. The absorbed radiations again come to earth’s surface and heat it up
II.CO2,CH4,CFSs and N2O are the gases which are responsible for greenhouse effect
III. Increase in the level of greenhouse gases results considerable heating of earth leading to global warming
Which of the statement given above are correct?
  •  I and II
  •  II and III
  •  I and III
  •  I,II and III
The atmosphere cover around the earth acts like glass walls of a greenhouse. It absorbs much of the incoming solar radiation from the sun and re-radiates to the earth’s surface However, it prevents the long wave infrared radiation emitted by the earth’s surface to escape into the space Thus, the atmosphere acts a greenhouse, trapping the heat. The gases in the atmosphere most responsible for keeping the earth’s surface warm are CO2,CH4,CFCs and NO2 and water vapours The increase in mean global temperature due to increased concentrations of greenhouse gases is called global warming. A recent survey has revealed 60%, 20%, 14% and 6% of warming effect of CO2,CH4,CFCs and NO2 respectively

Q6. Green house effect is due to the increased concentration of
  •  CO2
  •  Ne
  •  SO2
  •  NO2
Due to increase in CO2 concentration, a thick layer of CO2 is formed, which function as glass panel of a green house that prevent the heat from being re-radiated out. This is called green house effect.

Q7. Consider the following statements about scrubber
I. It is used to remove gases like sulphur dioxide from industrial exhaust
II. In a scrubber, the exhaust is passed through a spray of water or lime
III. Water dissolves gases and lime reacts with sulphur dioxide to form a precipitate of calcium sulphate and sulphide
Which of the statements given above are correct?
  •  I and II
  •  I and III
  •  II and III
  •  I, II and III
A scrubber can remove gases like sulphur dioxide. In wet scrubber, a fine spray of water or alkaline fluid like lime is allowed to fall over exhaust emissions. Water dissolves gases. The particles also become heavy and fall down. Lime reacts with sulphur dioxide to produce a precipitate of calcium sulphate or calcium sulphide is used to remove soluble gases and particles

Q8. El Nino effect is closely associated with
  •  Global warming
  •  Acid rain
  •  Greenhouse gases
  •  All of these
(a) El Nino effect is closely associated with global warming. Rise in temperature leads to deleterious changes in the environment and results in odd climatic changes ( El Nino effect)

Q9. ESP is to arrest
  •  Water pollution
  •  Air pollution
  •  Radioactive pollution
  •  Soil pollution
One of most appreciated air pollution cleaner system, ESP is widely used in various industries. It is applicable to pollutants particulate matter and hazardous air pollutants such as most metals. Wet ESPs are often used to control acid mists and can provide incidental control of volatile organic compounds.

Q10. …….. is an undesirable change in physical, chemical or biological characteristics of air, land, water or soil.
  •  Pollution
  •  Ecological disturbance
  •  Ecological deterioration
  •  Adulteration
Pollution. Pollution is an undesirable change in physical, chemical or biological characteristics of air, land, water or soil. Agents that bring about such undesirable changes are called as pollutants. Pollution is the unfavorable alteration of our environment largely because of human activities.

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