Ecological Tolerance: Understanding Organism Survival in Changing Environments

The video tutorial covers ecological tolerance, which is the range of conditions an organism can endure. It explains how organisms thrive within an optimum range and face stress or death outside it. A graph illustrates these concepts using a pH scale. Examples include polar bears and giraffes with different temperature tolerances, and salmon adapting to freshwater and saltwater. The tutorial emphasizes understanding these ranges for individual organisms and species.

What happens to organisms when they exceed their ecological tolerance limits?

• They thrive and reproduce more.

• They experience injury and eventually die.

• They become more adaptable.

• They migrate to new areas.

Which of the following is NOT an environmental factor affecting ecological tolerance?

• Amount of sunlight

• Dietary preferences

• Salinity

• Temperature

In the context of ecological tolerance, what does the 'optimum range' refer to?

• The range where organisms start to die off.

• The range where organisms are under stress.

• The range where no organisms can survive.

• The range where most organisms thrive.

What is the 'zone of physiological stress' in ecological tolerance?

• Where organisms thrive the most.

• Where organisms start to experience stress but can still survive.

• Where no organisms can survive.

• Where organisms are unaffected by environmental changes.

What defines the 'zone of intolerance' in ecological tolerance?

• Where organisms thrive the most.

• Where organisms start to experience stress.

• Where no organisms can survive.

• Where organisms are unaffected by environmental changes.

What is the 'preferred niche' in ecological tolerance?

• The range where organisms thrive the most.

• The range where organisms are unaffected by environmental changes.

• The range where organisms are under stress.

• The range where organisms do not survive.

How do polar bears' temperature tolerance ranges compare to giraffes'?

• Polar bears have a higher tolerance for cold temperatures.

• Polar bears have a lower tolerance for cold temperatures.

• Polar bears have a higher tolerance for warm temperatures.

• Polar bears and giraffes have the same temperature tolerance.

Which organism is known to change its tolerance range during its lifetime?

• Polar bears

• Elephants

• Giraffes

• Salmon

What is an example of an organism that starts life in freshwater and moves to saltwater?

• Salmon

• Giraffes

• Polar bears

• Elephants

Why might an organism's tolerance range change over time?

• Due to changes in environmental conditions.

• Due to changes in diet.

• Due to changes in migration patterns.

• Due to changes in social behavior.