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. Hydrogen sulphide causes
  •  Nausea
  •  Eye irritation
  •  Throat irritation
  •  All of these
Hydrogen sulphide causes nausea, eye and throat irritation

Q2.Which of the following is not an air polutant?
  •  NO_3
  •  SO_2
  •  Hydrocarbons
  •  CO_2
CO_2 is normally not an air pollutant. It is necessary for photosynthesis. Its rise has been due to large scale deforestation and large scale combustion of fossil fuels. When CO_2goes to high concentration, it causes global warming.

Q3.  UV-rays are non ionzing type and are lethal due to inactivation of
  •   Proteins
  •  Pigments
  •  Nucleic acid
  •  All of these
Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light but longer than X-rays. It is classified as non-ionising radiation, and can cause inactivation of protein, pigments and nucleic acids.

Q4. The oxygen concentration at the floor of te deep ponds and lakes is verylow because of the
  •  Over-hanging column of water
  •  Lesser amount of sunlight
  •  Decomposers
  •  Large number of anual inhabitants
The oxygen concentration at the floor of the deep ponds and lakes is very low because of the lesser amount of sunlight.

Q5.Three mile island and chernobyl disasters are associated with accidental leakage of
  •  Radioactive wastes
  •  Industrial wastes
  •  Municipal wastes
  •  Hospital wastes
 Radioactive wastes. Nuclear energy was assumed to be a natural, non-polluting way of electricity generation till the incidents at Three Mile Island and Chernobyl. It is now considered as the most potent pollutant Leakage of radioactive materials from thermal power plants and unsafe disposal of radioactive wastes are the main causes of radioactive pollution

Q6. Cuttingb of trees in a forest is called
  •  Reforestration
  •  Afforestration
  •  Deforestation
  •  None of these
Deforestation. 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

Q7.Which are the primary constituent of photochemical smog?
  •  CO_2 and NO_2
  •  Hydrocarbons and CFCs
  •  SO_2 and CO
  •  NO_2 and hydrocarbons
Photochemical smog is highly oxidizing polluted atmosphere comprising largely of nitrogen oxides (NO_x), ozone (O_3), H_2 O_2, organic peroxides and PAN. This is produced as a result of photochemical reaction among primary constituents like nitrogen oxides (NO_x), hydrocarbons and ozone (O_3).

Q8.Which of the following is non-degradable ?
  •  Sewage
  •  DDT
  •  Livestock waste
  •  Market garbage
The materials and poison such as aluminium ions, mercurial salts and DDT that either do not degrade or degrade only extremely slowly in the natural environment are called non-biodegradable pollutants.

Q9.Eutrophication is excessive growth of algae,plants and animals in water-bodies due to nutrient enrichment particularly with
  •  Nitrogen and phosphorus
  •  Calcium and phosphorus
  •  Sodium and calcium
  •  Nitrogen and calcium
Eutrophication is excessive growth of algae, plants and animals in water-bodies due to nutrient enrichment particularly with nitrogen and phosphorus

Q10. Read the following statements carefully and select the correct ones I. UV rays essential for the production as well as degradation of ozone gas II. Ozone present in ionosphere acts as a shield absorbing UV radiation coming from the sun III. One fourth of the incoming solar radiation is reflected by the atmospheric gases and clouds and only half of the incoming solar radiation falls on the earth’s surface, heating it. Of this only a small portion is reflected back
  •  I and II
  •  I and III
  •  II and III
  •  I, II and III
All of the given statements are correct except II Ozone present in stratosphere acts as a shield absorbing UV radiation coming from the sun

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