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Environmental issuesQUIZ-4

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. Which of the following statement is not correct?
  •  Ozone layer do not allow UV-B to reach the earth surface
  •  Ozone hole is an actual hole over Antarctica
  •  Halons are ozone depleting substances
  •  The active chlorine destroys ozone and convent it into O_2
Solution
Ozone hole is not an actual hole but an area of extreme reduction in ozone concentration in the ozone layer in stratosphere.

Q2.Decibel (dB) is a standard abbreviation used for the quantitative expression of
  •  The density of bacteria in a medium
  •  A particular pollutant
  •  The dominant Bacillus in a culture
  •  A certain pesticide
Solution
oise pollution is a physical form of pollution that affects the receiver directly. dB (decibel) is a standard abbreviation used for the quantitative expression of noise.

Q3.  Acid rain is due to
  •   CO_2 and H_2 O
  •  CO_2 and NO_2
  •  SO_2 and NO_2
  •  SO_2 and N_2 O
Solution
Acid rain is result of SO_2 and NO_2 pollution in atmosphere, SO_2 causes formation of H_2 SO_4and NO_2 causes formation of HNO_3.Both are strong acids.

Q4. CFCs are responsible for
  •  Ozone layer depletion
  •  Global warming
  •  Acid rain
  •  None of these
Solution
CFC_s(Chlorofluorocarbons) are mainly responsible for ozone layer depletion. CFC_s are used as cooling materials in refrigerators and air conditioners, propel aerosol sprays, etc. UV ray breaks CFCmolecules and release chlorine molecules, which reduce the ozone content in the atmosphere. One chlorine free radical is sufficient to destroy a lac of ozone molecules.


Q5.Domestic sewage contains nutrients like nitrogen and phosphorus which favours the excessive growth of planktonic(free floating) alage which can accelerate which of the following phenomenon?
  •  Algal bloom
  •  Biomagnification
  •  Eutrophication
  •  Both (a) and (c)
Solution
 Eutrophication is the phenomenon of nutrient enrichment of a water body that initially support a dense growth of plants and animal life Extensive increase of these algae is called water bloom. In many cases blooms are formed by blue-green algae. They are toxic to animals and humans

Q6. Air pollutants I. cause injury to all living organism II. reduce growth and yield of crops and causes premature death of plants III. affects the respiratory system of humans and animals Which of the statements given above are correct?
  •  I and II
  •  I and III
  •  II and III
  •  I, II and III
Solution
Air pollution has several effects on all living organism and on climate. Diseases like bronchitis, lung cancer and emphysema are caused by air pollution (i) NO_2 causes bronchitis and lowers the resistance to influenza (ii) SO_2 obstructs breathing and irritates eyes (iii) Nitric acid, nitrous acid and sulphuric acid causes respiratory diseases Air pollutants reduce growth and yield of crops and cause premature death of plants

Q7.Checking of re-radiating heat by atmospheric dust O_3,CO_2and water vapours is
  •  Green house effect
  •  Solar effect
  •  Ozone layer effect
  •  Radioactive effect
Solution
The main gases responsible for green house effect are CO_2,CH_4,CFCs,O_3,etc.

Q8.Cigarette smoking causes
  •  Skin cancer
  •  Blood cancer
  •  Bone cancer
  •  Lung cancer
Solution
Carcinogen Cancer tissue Cigarette smoke - lungs Soot, coal tar - Skin Leukamemia is blood cancer resulted due to unchecked proliferation of White Blood Cells(WBCs).

Q9.Which of the following are advantages of ecological sanitation? I. It is a practical, hygienic and efficient method of waste disposal II. It is cost effective III. Human excreta can be recycled into natural fertilisers, to replace chemical fertilisers
  •  I and II
  •  I and III
  •  II and III
  •  I, II and III
Solution
An ecologically compatible system of disposal of human excreta is the use of dry composting toilets called ecosan toilets. No water is required. Human excreta is converted into a resource as it forms natural fertilizer. Ecosan toilets are already working in many parts of Kerala and Sri Lanka


Q10. Global agreement in specific control strategies to reduce the release of ozone depleting substances, was adopted by
  •  Rio de Janerio conference
  •  Montreal protocol
  •  Kyoto Protocol
  •  Vienna Convention
Solution
The Montreal protocol on substances that deplete the ozone layer is a landmark international agreement designed to protect the stratospheric ozone layer. The treaty was originally signed in 1987 (effected in 1989) and substantially amended in 1990 and 1992. The Montreal protocol stipulates that the production and consumption of compounds that deplete ozone in the stratosphere-chlorofluorocarbons (CFC_s), halons, carbon tetrachloride and methyl chloroform-are to be phased out by 2000(2005 for methyl chloroform).

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ENVIROMENTAL ISSUES QUIZ-4
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