Biology Exam

Vocabulary flashcards covering ecological hierarchy, biodiversity, ecosystems, photosynthesizing producers, consumer levels, food webs, and nutrient cycles.

Population

A group of organisms belonging to the same species inhabiting a single area and capable of reproducing with each other.

Organism Community

All of the different populations of living organisms that inhabit and interact within a single environment.

Ecosystem

A biological system consisting of the non-living (abiotic) environment and the community of organisms inhabiting that environment.

Biosphere

All the parts of planet Earth where life can be found, including the atmosphere, hydrosphere, and lithosphere.

Producer

An organism, such as a plant, alga, or cyanobacterium, that converts solar energy into chemical energy through photosynthesis.

Photosynthesis

The cellular process occurring in chloroplasts where carbon dioxide and water are converted into sugar and oxygen using solar energy ($\text{carbon dioxide} + \text{water} \rightarrow \text{oxygen} + \text{sugar}$).

Nutrient

A chemical substance, such as nitrogen or phosphorous, that plants and other producers require in order to grow.

Biodiversity

The overall variety of living organism species found on planet Earth or within a specific ecosystem.

Ecosystem Service

A vital natural process provided by living organisms that supports human survival and activity, such as pollination by insects enabling fruit development.

Biodiversity Hotspot

A geographic area, primarily in tropical and subtropical zones or isolated oceanic islands, that accommodates exceptionally high levels of species diversity.

Endemic Species

Unique species that have developed in specific geographic regions, such as isolated islands, and are found nowhere else on Earth.

Coral Reef

A marine ecosystem built around calcium carbonate exoskeletons produced by coral invertebrates, supporting a majority of Earth's marine animal species.

Wetland

An ecosystem that combines elements of both water and land environments, providing habitat for diverse bird, reptile, and fish species.

Mangrove Forest

A diverse wetland ecosystem on tidal shores and river deltas adapted to fluctuating water levels that shelters spawning and growing fish.

Predator-Prey Relationship

An interaction where one species feeds upon another, directly affecting population sizes within a community.

Ecological Niche

The set of resources, environmental conditions, adaptations, and lifestyle habits utilized by a specific species.

Competition

An interaction between organisms or species with similar ecological niches that is harmful to both parties as they contend for shared resources.

Symbiosis

A close biological interaction where two different species live together in a mutually beneficial dependency.

Food Chain

A linear sequence representing the flow of chemical energy from producers through consumers and decomposers.

Food Web

A complex network that conceptualizes all interconnected food chains and feeding relationships within a community.

First Degree Consumer

An herbivorous organism, such as an alga-eating water flea, that feeds directly on primary producers.

Second Degree Consumer

An organism, such as a plankton-eating roach, that consumes first degree consumers.

Third Degree Consumer

A predatory organism, such as a pike, that feeds on lower-degree consumers.

Food Pyramid

A conceptual structure illustrating how the number of individual organisms and available energy decrease from producers up to top-level consumers.

Decomposer

An organism, such as a bacterium, fungus, or crayfish, that breaks down dead organic matter and waste, releasing nutrients back to producers.

Nutrient Cycle

The recurring movement of essential elements like nitrogen through producers, consumers, and decomposers back into the environment.