During successions, the first organisms that develop on bare rock are:
Correct answer: A. Lichens
- A. Lichens
- B. Shrubs
- C. Moss
- D. Herbs
Explanation
Lichens: This option is the correct answer. Lichens are the first organisms that typically colonize and establish on bare rock during primary succession. Lichens are a symbiotic association between fungi and algae or cyanobacteria. They can tolerate extreme environmental conditions and play a vital role in breaking down rock surfaces, contributing to the formation of soil for other plants to establish.
This question appeared on the UHS MDCAT 2015 paper, which you can sit online with every answer explained.
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About Ecosystems
An ecosystem consists of organisms interacting with one another and with abiotic factors such as light, water, soil and temperature. The topic covers populations and communities, food chains and webs, trophic levels, ecological pyramids, energy flow, nutrient cycles and ecological succession.
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