Ecology Concepts and Population Dynamics

This video tutorial covers key concepts in ecology, including habitat, niche, and population dynamics. It explains how species interact through competition, predation, and symbiotic relationships. The tutorial also discusses population growth patterns, such as exponential and logistic growth, and the factors that limit population size. Finally, it explores ecological succession, detailing the processes of primary and secondary succession.

What is the primary difference between a habitat and a niche?

• A habitat includes only biotic factors, while a niche includes only abiotic factors.

• A habitat is where an organism lives, while a niche is its role in the ecosystem.

• A niche is where an organism lives, while a habitat is its role in the ecosystem.

• A niche includes only biotic factors, while a habitat includes only abiotic factors.

What is competitive exclusion?

• The process by which species avoid competition by occupying different habitats.

• The process by which two species share the same niche.

• The process by which one species outcompetes another for the same niche.

• The process by which species evolve to occupy the same niche.

Which of the following is an example of inter-specific competition?

• Grass and dandelions competing for sunlight.

• Two frogs from different regions sharing a pond.

• Two lions fighting for territory.

• A snake eating a mouse.

In a mutualistic relationship, what happens to the species involved?

• Both species benefit.

• Both species are harmed.

• One species benefits, and the other is unaffected.

• One species benefits, and the other is harmed.

How is population density calculated?

• By adding the number of individuals to the area they occupy.

• By multiplying the number of individuals by the area they occupy.

• By dividing the number of individuals by the area they occupy.

• By dividing the number of individuals by the number of species.

What type of dispersion pattern do sloths exhibit?

• Linear

• Random

• Uniform

• Clumped

What characterizes exponential growth in a population?

• A slow increase due to limited resources.

• A rapid increase due to abundant resources.

• A stable population size due to carrying capacity.

• A steady decline due to competition.

What is carrying capacity?

• The average number of individuals in a population over time.

• The maximum number of species an ecosystem can support.

• The maximum number of individuals a population can sustain.

• The minimum number of individuals needed for a population to survive.

What is primary succession?

• The initial colonization of a barren area by pioneer species.

• The gradual change in species composition in an existing community.

• The replacement of one community by another over time.

• The process of species recolonizing an area after a disturbance.

Which of the following is an example of secondary succession?

• Lichens growing on bare rock.

• Pine trees growing after a forest fire.

• Mosses colonizing a new volcanic island.

• Grasses growing in a newly formed sand dune.