ESS EXAM MC | QUESTIONS & ANSWERS | 2026
What are two kinds of ecological succession? - Answers - - A) Primary and Secondary
Succession
What type of biome is cold and treeless? - Answers - - B) Tundra
3. When living things already exist in an ecosystem, what type of succession occurs? -
Answers - - C) Secondary Succession
What is Ecological Succession? - Answers - B) The process of change in the species
structure of an ecological community over time
Starts with bare rock followed by lichen or moss - Answers - A) Primary Succession
6. **After a volcanic eruption, lava covers the land. What is the order that plants grow to
repopulate the area?** - Answers - - A) Lichen, moss, grass, shrubs, trees
7. **Lichens are important to the creation of an ecosystem due to the fact that they
create soil by** - Answers - - A) Breaking down rock
8. **The first organisms that appear in an ecological community** - Answers - - A)
Pioneer species
9. **The greatest biodiversity on earth is found in the __________ biome.** - Answers -
- C) Tropical Rainforest
10. **A large naturally occurring community of flora and fauna occupying a major
habitat:** - Answers - - D) Biome
11. **What is a primary pollutant?** - Answers - B) A pollutant emitted directly from a
source
12. **What is the name given to lichen or moss during primary succession?** - Answers
- A) Pioneer species
13. **When something is added to the environment that is harmful or poisonous to living
things:** - Answers - B) Pollution
14. **What is a secondary pollutant?** - Answers - C) A pollutant that forms in the
atmosphere through chemical reactions
15. **Carbon monoxide is a type of ___________ pollutant.** - Answers - - A) Primary
pollutant
What are two kinds of ecological succession? - Answers - - A) Primary and Secondary
Succession
What type of biome is cold and treeless? - Answers - - B) Tundra
3. When living things already exist in an ecosystem, what type of succession occurs? -
Answers - - C) Secondary Succession
What is Ecological Succession? - Answers - B) The process of change in the species
structure of an ecological community over time
Starts with bare rock followed by lichen or moss - Answers - A) Primary Succession
6. **After a volcanic eruption, lava covers the land. What is the order that plants grow to
repopulate the area?** - Answers - - A) Lichen, moss, grass, shrubs, trees
7. **Lichens are important to the creation of an ecosystem due to the fact that they
create soil by** - Answers - - A) Breaking down rock
8. **The first organisms that appear in an ecological community** - Answers - - A)
Pioneer species
9. **The greatest biodiversity on earth is found in the __________ biome.** - Answers -
- C) Tropical Rainforest
10. **A large naturally occurring community of flora and fauna occupying a major
habitat:** - Answers - - D) Biome
11. **What is a primary pollutant?** - Answers - B) A pollutant emitted directly from a
source
12. **What is the name given to lichen or moss during primary succession?** - Answers
- A) Pioneer species
13. **When something is added to the environment that is harmful or poisonous to living
things:** - Answers - B) Pollution
14. **What is a secondary pollutant?** - Answers - C) A pollutant that forms in the
atmosphere through chemical reactions
15. **Carbon monoxide is a type of ___________ pollutant.** - Answers - - A) Primary
pollutant
