Question

1. in the process of ecological succession, the first organisms are called __ and the final community that exists in the ecosystem is called __.

a. producers, primary consumers
b. pioneer organisms, climax community
c. climax organisms, pioneer community
d. none of these

Explanation:

• Pioneer organisms: These are the first organisms to colonize a barren or disturbed area during ecological succession. They are often hardy species that can tolerate harsh conditions. For example, lichens are common pioneer organisms in primary succession (succession on a newly formed or exposed substrate like bare rock).
• Climax community: This is the final, relatively stable community that forms in an ecosystem. It is in a state of equilibrium with the environment. For instance, in a temperate forest region, a mature forest with a diverse array of trees, shrubs, under - story plants, and associated animals is a climax community.

• Option a: Producers (like plants that perform photosynthesis) and primary consumers (herbivores) are not terms related to the stages of ecological succession in the way the question asks. Producers are part of the trophic levels in an ecosystem, not specific to succession stages.
• Option c: The terms are reversed. Climax is the final stage, not the first, and pioneer is the first, not the final.
• Option d: Since option b is correct, option d is incorrect.

Answer:

B. pioneer organisms, climax community