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. Increase in concentration of a toxicant at successive trophic levels is called
  •  Eutrophication
  •  Accelerated Eutrophication
  •  Biomagnification
  •  Cultural Eutrophication
Biomagnification refers to increase in concentration of the toxicant at successive trophic levels. This happen because a toxic substance accumulated by an organism cannot be metabolized or excreted and is thus, passed on to the next higher trophic level. This phenomenon is well known for mercury and DDT.

Q2.Which of the following is not used for disinfection of drinking water?
  •  Phenyl
  •  Chloramines
  •  Chlorine
  •  Ozone
Phenyl is not used for disinfection of drinking water.

Q3.  One of the human disease due to Biomagnification of heavy metals is
  •   Minamata
  •  Asthma
  •  Tuberculosis
  •  Elephantiasis
Minamata is a disease, which is caused by the biomagnifications of heavy metal. It is caused by the excess of mercury. It affects different tissues and physiology.

Q4. Which of the following gases are the contributor to the greenhouse effect? I. Carbon dioxide II. Methane gas III. Nitrous oxide IV. Chlorofluorocarbon
  •  I, II and III
  •  II, III and IV
  •  I, III and IV
  •  I, II, III and IV
CFFs,CO_2,CH_4,NO_2 are greenhouse gases. The phenomenon of keeping the earth warm due to presence of these gases in the atmosphere is called greenhouse effect

Q5.Which one among the following is likely to have the highest level of DDT deposition in its body?
  •  Phytoplanktons
  •  Sea gull
  •  Crab
  •  Eel fish
 The increase in the concentration of a non-biodegradable pollutant through successive trophic levels is called biological magnification. Sea gull is the top consumer in the food chain therefore, highest concentration of DDT will be deposited in it. Phytoplanktons are producers in the water bodies therefore, they have least concentration of DDT.

Q6. Which of the following is biodegrable pollutant?
  •  Sewage
  •  Plastic
  •  Polythene
  •  DDT
Biodegradable pollutants are those which can be degraded through microbial action, e.g., sewage, livestock wastes, etc.

Q7.Which of the following is a major source of radioactive pollution?
  •  Leakage of radioactive materials from power plants
  •  Unsafe disposal radioactive wastes
  •  Both (a) and (b)
  •  Solid waste disposal sites
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

Q8.In India almost 40% forest have been lost in the ...A... and 1% forest in the ...B...region Here A and B refers to
  •  A-gangetic plains;B-deccan plateau
  •  A-tropics;B-temperature
  •  A-temperature;B-tropics
  •  A-western ghats;gangetic plains
Almost 40% forest have been lost in the tropics and 1% forest in the temperate region

Q9.In plants ,air pollution causes
  •  Reduced growth and yield
  •  Leads to premature death
  •  Both (a) and (b)
  •  Wilting
Air pollutants reduces the growth and yield of crops and causes premature death of plants

Q10. Study carefully the following pie diagram represting the relative contribution of various greenhouse gases to total global warming.Identify the gases A,B,C and D

  •  A-N_2 O,B-CO_2,C-CH_4,D-CFCs
  •  A-CO_2,B-CH_4,C-CFCs,D-N_2 O
  •  A-CH_4,,B-CFCs,C-N_2 O,D-CO_2
  •  A-CFCs,,B-N_2 O,C-CO_2,D-CH_4
A-CO_2 (60%),B-CH_4 (20%),C-CFCs(14%),D-N_2 O(6%)

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