Match column I with column II. Column I Column II 1. GHG (a) Paedogenesis 2. CFCs (b) Methane 3. PAN (c) Global warming 4. Lichen (d) Smog

1-b Greenhouse gases are those gases that absorb radiant energy within the thermal infrared range and emit heat in all directions. Methane is an example of it. 2-c Chlorofluorocarbons are nonflammable chemical compounds containing carbon, chlorine, and fluorine. They are used in the manufacture of aerosol sprays, foams, packing materials, and refrigerants. They are the major ozone-depleting substances that cause global warming. 3-d PAN or Peroxyacyl nitrates are powerful components of photochemical smog. It causes respiratory and eye irritation. They are formed in the atmosphere when oxidized organic compounds combine with nitrogen dioxide. 4-a Paedogenesis is a process in which biological agents like lichens and mosses that leads to the breakdown of rock into smaller particles by producing organic acids. Colum I Column II 1. GHG (b) Methane 2. CFCs (c) Global warming 3. PAN (d) Smog 4. Lichen (a) Paedogenesis

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Science for Ninth Class (Part-3) Biology>Chapter 6 - Natural Resources>PAPER-PEN TEST

P S Verma and V K Agarwal Solutions for Chapter: Natural Resources, Exercise 6: PAPER-PEN TEST

Author:P S Verma & V K Agarwal

P S Verma Biology Solutions for Exercise - P S Verma and V K Agarwal Solutions for Chapter: Natural Resources, Exercise 6: PAPER-PEN TEST

Attempt the practice questions on Chapter 6: Natural Resources, Exercise 6: PAPER-PEN TEST with hints and solutions to strengthen your understanding. Science for Ninth Class (Part-3) Biology solutions are prepared by Experienced Embibe Experts.