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. World environment day is celebrated on
  •  1st February
  •  8th March
  •  6th December
  •  5th June
World environment day is celebrated on 5th june.

Q2.Foul smell in the water bodies of tanks,ponds etc,is due to
  •  Aerobiosis
  •  Anaerobiosis
  •  Psammophytes
  •  Biological magnification
Entrophication is natural state in many lakes and ponds, which have a rich supply of nutrients, this leads to decomposition of nutrients through bacteria and other decomposers by the process of anaerobic respiration. This causes foul smell.

Q3.  The phenomenon by which certain pollutants (e.g., DDT, Mercury) accumulates in the body tissues in increasing concentration is called
  •   Biological degradation
  •  Biological magnification
  •  Eutrophication
  •  Bioprecipitation
Many pesticides, such as DDT, aldrin and dieldrin, have a long life time in the environment. They are fat soluble and generally non-biodegradable. They get incorporated into the food chain and ultimately gets deposited in the fatty tissues of animals and humans In the food chain, because of their build up, they get magnified in the higher trophic levels called biological magnification. The phenomenon of biological magnification is also reported for certain other pollutants, such as heavy metals like lead, mercury and copper and radioactive substances as strontium-90

Q4. Most hazardous metal pollutant of automobile exhaust is
  •  Cadmium
  •  Lead
  •  Mercury
  •  Copper
Automobiles burn petroleum inefficiently causing 80% of air pollution and 75% of noise pollution. Automobile exhausts consists of hydrocarbon (13.7%), carbon monoxide (77.2%), nitrogen oxides (7.7%), sulphur oxides, ammonia, aldehydes and lead (90% of total lead poisoning). Lead is present in the form of Pb (CH_3 )_4and (C_2 H_5 )_4as anti-knock agent in automobiles exhaust. It interferes with oxygen and glucose metabolism, haeme synthesis and damages the vital organs of body.

Q5.High amount of Escherichia coil in water indicates
  •  Hardness of water
  •  Industrial pollution
  •  Swage polltion
  •  Pollution due to electromagnetic radiation
 The presence of E. coli bacteria indicates possible sewage contamination of water because E. coli is found only in the mammalian intestinal tract including that of humans. E. coli bacteria belong to the coliform bacteria group. Coliforms found in mammals are called faecal coliforms. Most coliforms are E. coli. So, E. coli tests are used as indicator of faecal coliforms

Q6. Slash and burn agriculture is called
  •  Ley farming
  •  Commercial agriculture
  •  Jhum cultivation (shifting cultivation)
  •  All of the above
Slash and burn farming is a form of shifting agriculture where the natural vegetation is cut down and burned as a method of clearing the land for cultivation and then, when the plot becomes infertile, the farmer moves to a new fresh plot and does the same again. This process is repeated over and over

Q7.Forests in india, according to Central Forestry commission(1980) are about
  •  19.4%
  •  18.3%
  •  30%
  •  14.0%
Forests in India according to central Forestry commission (1980) are about 19.4%

Q8.Kyoto protocol has specified the commitments of different countries
  •  To mitigate climate changes
  •  Limit production of chlorofluorocarbons
  •  To prepare a world climate programme
  •  None of the above
Kyoto protocol has specified the commitments of different countries to mitigate climate changes.

Q9.Soil erosion can be prevented by
  •  Increasing bird population
  •  Afforestration
  •  Removal of vegetation
  •  Overgrazing
Afforestation is the process of establishing a forest on land that is not a forest or has not been a forest for a long time by planting trees or their seeds Soil erosion occurs when the soil is blown away by the wind or washed away by the rain. Roots of trees/plants hold the soil. Thus, when more trees are planted their roots don’t allow the soil to be blown or washed away and prevent soil erosion

Q10. Which of the following statement is correct about DDt?
  •  It is a biomagnifying biodegradable pollutant
  •  It is non-biomagnifying biodegradable pollutant
  •  It is biomagnifying non-biodegradable pollutant
  •  It is not a pollutant
DDT has been recently banned because it is non-biodegradable and biomagnifying pollutant. Biomagnifications means the increase in amount of DDT in the body of organism alongwith the trophic level. Hence, the amount of DDT in first trophic level will be minimum and in top consumer will be maximum.

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