What makes one biome different from another, and what shapes life in aquatic systems?
Compare and contrast the characteristics of major biomes, describe what determines the distribution of life in aquatic systems, and explain ecological succession (NGSSS SC.912.L.17.6, SC.912.L.17.2, and SC.912.L.17.4; Reporting Category 3, Organisms, Populations, and Ecosystems).
A benchmark-level answer on biomes and aquatic systems for the Florida Biology 1 EOC: how temperature and rainfall define biomes, the factors shaping aquatic life, the levels of ecological organization, and ecological succession.
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What this topic is asking
These Reporting Category 3 benchmarks (SC.912.L.17.6, SC.912.L.17.2, SC.912.L.17.4) ask you to compare biomes, describe what shapes aquatic life, and explain ecological succession. For the Florida Biology 1 EOC you need to know that climate (temperature and rainfall) defines a biome, the factors that determine aquatic life, the levels of ecological organization, and how communities change over time through succession. Items test the climate-defines-biome idea and identifying succession.
What defines a biome
The EOC tests this directly: climate (temperature and rainfall) sets the biome and the organisms it can support.
Life in aquatic systems
The distribution of life in aquatic systems (oceans, lakes, rivers) is shaped by physical and chemical factors:
- Light: only the upper, sunlit layers support photosynthesis, so most producers live near the surface.
- Depth and temperature: deeper water is darker and colder.
- Salinity: the salt content separates freshwater (lakes, rivers) from marine (saltwater) systems, and organisms are adapted to one or the other.
- Dissolved oxygen and nutrients: affect which organisms can survive.
So an aquatic item often hinges on light (photosynthesis near the surface) or salinity (fresh versus salt water).
Levels of ecological organization
Knowing this order (organism to biosphere) lets you place any ecological term, and it parallels the cellular levels of organization.
Ecological succession
Succession is how an ecosystem recovers after disturbance and how communities develop over time, often toward a relatively stable mature community.
Try this
Q1. State the two main abiotic factors that determine which biome forms in a region. [2]
- Cue. Temperature and precipitation (rainfall).
Q2. State the difference between primary and secondary succession. [2]
- Cue. Primary succession starts where there is no soil (bare rock); secondary succession follows a disturbance where soil remains, and is faster.
Exam-style practice questions
Practice questions written in the style of FLDOE exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
FL Biology 1 EOC (2023 released style)1 marksWhich two abiotic factors most determine which biome forms in a region? (A) Temperature and precipitation (rainfall). (B) The number of predators and prey. (C) Soil color and wind speed only. (D) The kinds of decomposers present.Show worked answer →
A 1-point multiple-choice item on what defines a biome.
The correct answer is A. Biomes (such as desert, tropical rainforest, tundra, and grassland) are defined mainly by their climate, especially temperature and the amount of precipitation, which determine the types of organisms that can live there. B and D are biotic factors that result from the biome, and C is too narrow.
Climate (temperature and rainfall) sets the biome and the organisms it can support.
FL Biology 1 EOC (2024 released style)1 marksAfter a forest fire clears an area, grasses grow first, then shrubs, then trees over many years, gradually rebuilding the community. This process is called: (A) natural selection. (B) ecological succession. (C) the carbon cycle. (D) homeostasis.Show worked answer →
A 1-point item on ecological succession.
The correct answer is B. Ecological succession is the gradual, predictable change in the species of a community over time, here the recovery of a disturbed area (grasses, then shrubs, then trees). This is secondary succession because soil remained. The other options are different processes.
Related dot points
- Use a food web to identify producers, consumers, and decomposers, and explain the transfer of energy through trophic levels and the reduction of available energy at each level (NGSSS SC.912.L.17.9; Reporting Category 3, Organisms, Populations, and Ecosystems).
A benchmark-level answer on energy flow for the Florida Biology 1 EOC: producers, consumers, and decomposers, food chains and webs, trophic levels, the energy pyramid, and the ten percent rule.
- Explain how matter cycles through ecosystems, including the carbon, nitrogen, and water cycles, and the roles organisms play in them (NGSSS SC.912.L.17; Reporting Category 3, Organisms, Populations, and Ecosystems).
A benchmark-level answer on biogeochemical cycles for the Florida Biology 1 EOC: the carbon cycle (photosynthesis and respiration), the nitrogen cycle and nitrogen-fixing bacteria, the water cycle, and how matter cycles while energy flows.
- Analyze how population size is determined by births, deaths, immigration, and emigration, and how limiting factors (biotic and abiotic) determine the carrying capacity of an environment (NGSSS SC.912.L.17.5; Reporting Category 3, Organisms, Populations, and Ecosystems).
A benchmark-level answer on population dynamics for the Florida Biology 1 EOC: how births, deaths, immigration, and emigration change population size, limiting factors, carrying capacity, and exponential versus logistic growth.
- Recognize the consequences of the loss of biodiversity, and predict the impact of human activities on ecosystems and the need for sustainability (NGSSS SC.912.L.17.8 and SC.912.L.17.20; Reporting Category 3, Organisms, Populations, and Ecosystems).
A benchmark-level answer on biodiversity and human impact for the Florida Biology 1 EOC: why biodiversity matters, causes of biodiversity loss (habitat loss, invasive species, pollution, climate change), human impacts, and sustainability.
- Discuss the properties of water that contribute to Earth's suitability as an environment for life (NGSSS SC.912.L.18.12; Reporting Category 1, Molecular and Cellular Biology).
A benchmark-level answer on water for the Florida Biology 1 EOC: polarity and hydrogen bonding, cohesion and adhesion, high heat capacity, the universal solvent, and why ice floats.
Sources & how we know this
- Next Generation Sunshine State Standards: Science (Biology 1) — Florida Department of Education (2024)
- Biology 1 End-of-Course Assessment Test Item Specifications — Florida Department of Education (2024)