Question

1. Which of the statements below accurately reflects the assumptions of the competitive exclusion principle?

A.The competitive exclusion principle assumes that the competitors have the exact same resource requirements and that environmental conditions may be variable.

B. The competitive exclusion principle assumes that competitors have different resource requirements and that environmental conditions remain constant.

C. The competitive exclusion principle assumes that the competitors have the exact same resource requirements and that environmental conditions remain constant.

D. The competitive exclusion principle assumes that the competitors have resource partitioning and that environmental conditions remain constant.

E. The competitive exclusion principle makes no assumptions about the competitors.

2. Which of the following statements is true?

A. Germination rates vary among species, but these differences do not translate into differences in competitive ability.

B. Temperature, humidity, and salinity have little effect on competition.

C. Plants with high growth rates under high light conditions tend to be overgrown quickly in newly opened habitat patches.

D. The outcome of competition can be influenced by factors other than limited resources.

D. Multiple species tend to perform their best under the exact same conditions.

3. What is a zero-growth isocline?

A. the set of values of two population sizes where the growth rate is 0

B. the set of values where α = β

C. when the population size of species 1 exceeds species 2

D. the set of values where the carrying capacity is reached for one of the two species

Answer 1

1) answer is C.

Competitive Exclusion Principle :

• Competitors can not exist together at the same place. One of them must be compleately extinct
• Assumptions:

1. Competitors required exactly same (no more, no less) resources.
2. Environmental conditions remain constant.

2) answer is D i.e. The outcome of competition can be influenced by factors other than limited resources.

3) answer would be A- the set of values of two population sizes where the growth rate is zero.

zero growth isoclines is the equation of straight lines that explain the N1 and N2 combinations at which N1 (or N2) population growth is zero. Above the isocline of zero, the population of a species is decreasing and below the isocline, the population of a species is increasng. A line among which there is neither increase nor decrease should split the combinations result in an increase from those causing a decrease is the isocline of zero populaiton growth.