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. Arrange the following options in ascending order of their BOD value.
I Sample of highly polluted pond water.
II Sample from unpolluted pond water.
III Distilled water.
  •  III->I->II
  •  II->III->I
  •  III->II->I
  •  I->III->II
Biochemical oxygen demand is the oxygen in milligrams required for five days in one liter of water at 20 ℃ for the microorganisms to metabolise organic waste. BOD increases with increase of pollution.

Q2. Which of the following is secondary pollutant?
  •  NO
  •  NO2
  •  SO2
  •  PAN
PAN (Peroxyacetyl nitrate) is a secondary pollutant.

Q3. Which one of the following statement is wrong in case Bhopal gas tragedy?
  •  Thousands of human being died
  •  Radioactive fall out engulfed Bhopal
  •  It look place in the night of December 2/3,1984
  •  Methyl isocyanate gas leakage took place
Bhopal gas tragedy (Bhopal disaster) the world’s worst industrial catastrophes. It occurred on the night of December 2/3,1984 at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh. A leak of methyl ioscyanate gas and other chemicals from the plant resulted the exposure of hundreds of thousands of people. The official immediate death toll was 2,259 and the government of Madhya Pradesh has confirmed a total of 3,787 deaths related to the gas releases.

Q4. Kyoto protocol is related with
  •  Ozone layer depletion
  •  Greenhouse effect
  •  Water pollution
  •  Conservation of wildlife
An international conference was held in Kyoto, the ancient capital of Japan on 1 to 10 December, 1997 of G-77 countries. It is popularly known as Kyoto protocol. In this, emphasis is given on global warming. Later is the result of increasing use of green house gases such as CO2, methane, oxides of nitrogen,CFCs,etc.

Q5. Which one of the following is the heavy toxic metal present in waste water from industries?
  •  Mercury
  •  Cadmium
  •  Lead
  •  All of these
Industries like petroleum, paper manufacturing, metal extraction and processing, etc., release waste water containing heavy metals like mercury cadmium, copper, lead, etc.

Q6. Amrita Devi Bishnoi wildlife protection award is for the individuals or communities from rural areas that have extraordinary courage in
  •  Reducing Greenhouse effect
  •  Reducing air pollution
  •  Reducing Global warming
  •  Protecting wildlife
Protecting wildlife. In 1731, a Bishnoi woman, Amrita Devi showed exemplary courage by hugging a tree to prevent its cutting. Government of India has recently instituted the Amrita Devi Bishnoi Wildlife Protection Award for individuals or communities from rural areas that have shown extraordinary courage and dedication in protecting wildlife

Q7. The cause of decline in the population of reptiles and birds is
  •  DDT
  •  Biofertilizers
  •  Bioinsecticides
  •  Sewage
The reptiles and birds are mostly secondary or tertiary consumers. The concentration of DDT is increased in them. DDT is non-biodegradable pollutant, responsible for decline in the population of birds and reptiles.

Q8. Which of the following statement is/are not correct regarding biomagnification?
I. Heavy metals and persistent pesticides pass into food chain and increases in amount per unit weight of organisms with the rise in trophic level due to their accumulation in fat
II. Accumulation of zinc can cause thinning of eggshell in birds
III. DDT accumulation is a major cause of killing of fish-eating birds
IV. Biomagnification occurs only in marine food chain
  •  I and II
  •  II and III
  •  II and IV
  •  I and III
Biomagnification is defined as increase in concentration of toxicants at successive trophic levels. Higher amounts of pesticide disturb calcium metabolism of birds resulting in thinning of eggshells. Biomagnification occurs in all aquatic food chain

Q9. The diagram below show the biomagnification of DDT in an aquatic food chain. Choose the correct statement regarding this

I. Biomagnification refers to increase in concentration of the toxicant at successive trophic levels
II. High concentrations of DDT disturb calcium metabolism in birds, which causes thinning of eggshell and their premature breaking
III. River water may have a very low concentration of DDT, but the carnivorous fish in that river may contain high concentration of DDT, which is still suitable for consumption by human beings
Which of the statements given above are correct?
  •  I and II
  •  I and III
  •  II and III
  •  I, II and III
Heavy metals and persistent pesticides (e.g., organochlorine or chlorinated hydrocarbons like DDT) pass into food chain and increase in amount per unit weight of organisms with the rise in trophic level due to their accumulation in fat. Higher amounts of pesticide disturb calcium metabolism of birds resulting in thinning of egg shells and their premature breaking that kills the embryos

Q10. The unfavorable alteration of environment due to human activities is termed as
  •  Ecological disturbance
  •  Catastrophe
  •  Ecological degradation
  •  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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