VPE 511: Environment and Environmental Hygiene (2+1)

ABIOTIC SUBSTANCES

Abiotic substances

• Physical factors: They include sunlight, shade, temperature, rainfall, wind, latitude, altitude, soil type and water.
• Chemical factors: They include
  • inorganic factors-C,N₂,P,K, H₂,O_2,S
  • Organic factors-Protein, Carbohydrates and fats.

Biotic substances

• Producers: They are producing their own food and therefore they are called autotrophs, (eg. Green plants and bacteria).
  • Photo-autotrophs : Green plants prepare food during photosyntheses
    • Photo-autotorphs: Green plants prepare food during photosynthesis.

                                                                                  Light

                    Photosynthesis = 6CO₂ +12H₂O    ---------------  C₆H₁₂O₆ + 6O₂ +6H₂O

                                                                              Chlorophyll          (Glucose)

• Chemto- autotrophs: Sulphur bacteria prepare organic compounds from H₂S and Co₂. 

                          H₂S +CO₂   ________ organic compounds

                                                    ^Heat