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Advanced Ecosystem Science

Ecology

A deep dive into the complex relationships within ecosystems, focusing on energy transfer, nutrient cycles, and symbiotic classifications.

ecosystems symbiosis energyflow
8 Questions Hard Ages 5+ Apr 9, 2026

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About this Study Set

This study set covers Ecology through 8 practice questions. A deep dive into the complex relationships within ecosystems, focusing on energy transfer, nutrient cycles, and symbiotic classifications. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 8 questions from the Advanced Ecosystem Science study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 In a typical energy pyramid, what percentage of energy is generally passed from one trophic level to the next highest level?
  • A About 1%
  • B About 10%
  • C About 50%
  • D About 90%
2 Which process allows nutrients like nitrogen and phosphorus to be returned to the soil from dead organic matter?
  • A Photosynthesis
  • B Transpiration
  • C Decomposition
  • D Respiration
3 What term describes a symbiotic relationship where one organism benefits while the other is neither helped nor harmed?
  • A Mutualism
  • B Parasitism
  • C Commensalism
  • D Competition
4 Which specific layer of soil in the Tundra biome remains frozen year-round and prevents deep-rooted plants from growing?
  • A Topsoil
  • B Bedrock
  • C Permafrost
  • D Subsoil
5 What is the name for a species that has an unusually large effect on its ecosystem, such that its removal could cause the ecosystem to collapse?
  • A Keystone species
  • B Invasive species
  • C Indicator species
  • D Apex predator
6 Which group of organisms is responsible for producing approximately half of the world's oxygen through photosynthesis in the oceans?
  • A Coral reefs
  • B Seaweed
  • C Phytoplankton
  • D Mangroves
7 Ecological succession that begins in an area where no soil exists, such as on a new volcanic island, is known as what?
  • A Secondary succession
  • B Primary succession
  • C Climax community
  • D Pioneer transition
8 Some animals enter a state of dormancy similar to hibernation to survive extremely hot and dry periods. What is this called?
  • A Migration
  • B Brumation
  • C Estivation
  • D Insulation
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