Question

Which one of the following factors is abiotic?

• A. Photoperiod
• B. Carbon dioxide content of the soil
• C. Texture and porosity of soil
• D. Rainfall

Answer 1

The correct option is B Carbon dioxide content of the soil

Carbon dioxide content is decided by the balance between biological processes which consume carbon dioxide like photosynthesis and biological processes which produce carbon dioxide like respiration. The carbon dioxide content in the soil will be decided by the level of aeration, root respiration, water level, soil microorganisms etc.