This set of Life Sciences Multiple Choice Questions & Answers (MCQs) focuses on “Population Ecology & Biotic Community”.
1. The collection of individuals which belongs to the same species when live together in a region is known as ____________
a) Keystone species
Explanation: A population is a group of individuals which belongs to the same species and living in the same region. Population ecology deals with the study of the population.
2. The size of the population is represented by the property called density.
Explanation: Density is the representation of population size. It expressed the total number of individuals per unit area at a given time.
3. Name the term which defines the study of the characteristics and parameters of the population.
b) Population ecology
c) Population density
Explanation: The population is defined by the characteristics of the group rather than the individual. The study of the characteristics of the population is known as demography.
4. Which of the following term defines the ability of the individual in the population to produce new individuals?
d) Population dispersal
Explanation: Natality is the ability of an individual to produce new individuals while mortality is the death of the individuals in the population.
5. Which of the following survivorship curve is suitable for the organisms who breeds several times during the course of their life span?
a) Type IV
b) Type III
c) Type II
d) Type I
Explanation: Type I survivorship curve is typically for those organisms who can breed several times during their life span. This strategy is referred to as iteroparous.
6. Name those organisms who can breed only once in their lifetime?
Explanation: Semelparous are those organisms who can breed only once in their lifetime. It is a type of reproductive event and mainly represented by a type III survivorship curve.
7. Which of the following structure can be seen in the diminishing population?
c) Bell shaped
Explanation: Diminishing population resulted in an urn-shaped structure. It shows the drastic reduction in the birth rate or population that is dying off.
8. A group of people coexist within space and time and interact with each other is known as ____________
a) Keystone species
Explanation: The community is the group of the population, which coexist within space and time and interact with each other either directly or indirectly.
9. Community refers to living and non-living components of the ecosystem.
Explanation: Community refers only to the living population in the ecosystem and it does not involve non living component.
10. Which of the following defines the separation of two different communities?
b) Edge effect
Explanation: Ecotone is a zone of vegetation which separates two different types of communities. It is also known as a transition zone.
11. What is an edge effect?
a) Community complexity
b) Community classification
c) Increased diversity at the boundary of ecotone
d) Community stability
Explanation: Edge effect can be generally seen at the boundary of the Ecotone. It shows the maximum diversity at the transition boundary.
12. Which of the following is TRUE for the stabilized ecosystem?
b) P/R < 1
c) P/R > 1
d) P/R =1
Explanation: Ecosystem has been classified on the basis of community metabolism. The ratio of photosynthesis to respiration, i.e., P/R is equal to 1 for a stabilized ecosystem.
13. Name the term which defines the ability of community return to its original state after being displaced?
Explanation: Community stability has been categorized into two categories, i.e., resilience and resistance. Resilience is the ability of the community to return to its original state after the displacement.
14. Which of the following is a diversity index?
a) Upright index
b) Inverted index
c) Bell shaped index
d) Simpson’s index
Explanation: Diversity index is the measure of diversity of species in the community. Simpson’s and Shannon index are basically used to measure the diversity of the community.
Sanfoundry Global Education & Learning Series – Life Sciences.
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