Limiting Factors & Range of Tolerance

How many essential elements are needed by the majority of life on Earth?

• 8

• 24

• 48

• 16

What five factors did Blackman identify that operate at limiting levels for photosynthesis?

• Sunlight, water, carbon dioxide, temperature, and chlorophyll

•  Soil, nitrogen, sunlight, temperature, and humidity

• Water, minerals, carbon dioxide, oxygen, and light

• Sunlight, oxygen, chlorophyll, minerals, and temperature

What is the range of tolerance?

• The lowest level where an organism survives

• The area in between the highest and lowest levels at which an organism can survive.

• The highest level where an organism still survives

Within the range of tolerance, were are the highest numbers of organisms seen?

• Optimum zone

• Zone of tolerance

• Zone of intolerance

• Zone of physiological stress

When an organisms go dormant during hot or dry periods this is called______________?

• hybernation

• limiting factor

• estivation

• range of tolerance

Why are there only a few organisms in the zone of physiological stress?

• Many organisms that live in this zone will die off.

• All of these

• Only the strongest organisms can survive here

• Most organisms will move away from this zone

When humans change the environment through pollution or global warming, what effect can this have on the zone of tolerance?

• It will decrease the optimum zone levels

• It will increase the optimum zone levels

• It won't change the zones, it will push organisms out of the optimum zone