Ecology Ecological Succession 3

Question 1

Which of the following is an example of autogenic succession?

Accepted Answer

Vegetation changing a bog into a forest through peat accumulation

Answer

A glacier retreating and exposing new rock

Answer

Volcanic ash depositing on an existing grassland

Answer

A flood depositing new sediment on a riverbank

Question 2

In lake succession (hydrosere), what is the typical progression from an open water body to a terrestrial community?

Accepted Answer

Lake → marsh → shrubs → forest

Answer

Lake → forest → shrubs → marsh

Answer

Lake → meadow → desert → forest

Answer

Lake → peat bog → coral reef → grassland

Question 3

Which factor most directly determines whether the climax community in a region is deciduous forest, grassland, or desert?

Accepted Answer

Climate, particularly temperature and precipitation patterns

Answer

The type of pioneer species that first colonize the area

Answer

The number of herbivores in the ecosystem

Answer

Soil pH at the start of succession

Question 4

The concept of 'relay floristics' in succession refers to:

Accepted Answer

Sequential replacement of species groups where each facilitates the next

Answer

A single species dominating all stages of succession

Answer

The random colonization of species with no predictable pattern

Answer

Competitive exclusion of all but one species

Question 5

Which of the following best explains why later successional species tend to be taller and longer-lived than early successional species?

Accepted Answer

Later species are adapted to compete for light in increasingly shaded environments

Answer

Later species are adapted to high-disturbance, resource-rich environments

Answer

Later species arrive first and simply grow larger over time

Answer

Later species require bare mineral soil to germinate

Question 6

Fire-maintained ecosystems like some grasslands and pine forests are best described as:

Accepted Answer

Disclimax or fire-maintained communities that depend on periodic disturbance

Answer

True climax communities that are self-sustaining without disturbance

Answer

Pioneer stage communities that will soon be replaced by deciduous forest

Answer

Ecosystems that have never undergone succession

Question 7

What is chronosequence analysis, and why is it used in studying succession?

Accepted Answer

It uses sites of different ages since disturbance as surrogates for time to study long-term successional change

Answer

It measures species diversity at a single point in time across all habitat types

Answer

It tracks individual organisms throughout their entire life history

Answer

It models future climate conditions based on current succession patterns