Question

1. Population size will always decrease if…

a. rmax = 0.5

b. N > K

c. there is exponential growth

d. N = 1000

e. The growth model is density-dependent

2. Which of the following describes K-selected populations?

a. Density-dependent, low competition for resources, little parental care, lots of large offspring

b. Density-independent, highly likelihood of surviving to reproduce again, little parental care, unstable environment

c. Density-dependent, many offspring, high competition for resources, small offspring

d. Density-dependent, high likelihood of surviving to reproduce again, high survival offspring, “lots” of parental care

e. Density-independent, high competition for resources, little parental care, large offspring

3. Realized niche is necessarily_________________ than a fundamental niche.

a. Larger than

b. The same size as

c. Larger than or the same size as

d. Smaller than

e. Smaller than or the same size as

4. The intermediate disturbance hypothesis (IDH) is related to succession which of the following ways?

a. Intermediate levels of disturbance act to disrupt the succession process and allow early succession species to reestablish.

b. The intermediate disturbance hypothesis does not relate to succession.

c. Communities at later successional stages will be more diverse according the IDH.

d. Intermediate levels of disturbance will favor K-selected species.

e. Low levels of disturbance increase diversity by adding r-selected species to habitats according to the IDH.

5. An island that is close to the mainland has higher diversity than an island far from the mainland because

a. The immigration rate is lower and the extinction rate is higher on the close island

b. The immigration rate is higher and the extinction rate is lower on the close island

c. The immigration rate and extinction rate are both higher on the close island

d. The extinction rate and immigration rate are both lower on the close island

e. Islands closer to the mainland have lower diversity

Answer 1

Answere :

Question 1 : The correct option is Option (b) i.e. N>K.

Explanation :  When population size (or N) is greater than carrying capacity (or K), the population size will decrease.

Question 2 : The correct option is Option (d) i.e. Density-dependent, high likelihood of surviving to reproduce again, high survival offspring, “lots” of parental care.

Explanation :  Species with K-selected reproductive strategy have a low intrinsic growth rate that causes the population to increase slowly until it reaches carrying capacity. Some characteristics of a K-selected species are :
-stable environment
-large body size
-long life expectancy
-high parental care
-fewer offspring
Few examples of K-selected species are : humans, elephants, whales, arctic turn.

Question 3 : The correct option is Option (e) i.e. Smaller than or the same size as.

Explanation : Realized niche is necessarily Smaller than or the same size as than a fundamental niche. Realized niche is the actual set of environmental conditions (biotic and abiotic) in which a species can establish a stable population in the presence of competitors. Fundamental niche is the full range of environmental conditions (biotic and abiotic) in which a species is able to maintain a stable population in the absence of competitors.

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