NEET Biology question
Not in NEET syllabus
Read the following statements regarding particulate matter and select the incorrect ones. 1. Particulate matter (PM) consists of soot, flyash, dust, spores, pollen grains, etc. 2. Particulate matter is differentiated into settleable (larger than 10 µm, remaining in air for less than one day) and suspended particulate matter (less than 10 µm, remaining in air for more than one day to several weeks) 3. SPM (Suspended particulate matter) consists of aerosol, dust and mist 4. Particulate matter causes respiratory diseases such as tuberculosis, allergy and many more diseases in animals and plants 5. According to the Central Pollution Control Board (CPCB), particulate size of 2.5 µm or less are responsible for causing the greatest harm to human health
Solution
All five statements accurately describe particulate matter: its composition (soot, fly ash, dust, spores, pollen), its size-based classification into settleable and suspended particulate matter with the stated residence times, SPM's
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