Question

Who determine to a large extent geographical distribution of different species?

• A.
  All of the above
  
• B.
  Regional and local variations
  
• C.
  The level of thermal tolerance
  
• D.
  Physico-chemical components
  

Answer 1

The correct option is C

The level of thermal tolerance

Effect of factors on geographical distribution of species

The abiotic factors or the physio-chemical factors which affect the distribution of species include light, water, temperature, soil nutrients etc.

Organisms show adaptations for local and regional variations.

Depending upon the ability to tolerate variation in temperature, organisms are of two types:

• Eurythermal organisms

• Stenothermal organisms

Each organism has specific temperature requirements where it can survive. Hence, thermal tolerance determines the geographical distribution of different species depending on their optimal requirements.