Ecology and Biodiversity

An ecosystem consists of the community of living organisms (biotic) interacting with the non-living (abiotic) components of their environment.

A community is defined as all the different populations of organisms that live together in a particular area. A biome is a much larger regional ecosystem.

A population is defined as all members of the same species living in a specific area at the same time.

Biotic factors include all living or once-living components of an ecosystem. This includes organisms, their remains, and products like waste or organic matter.

A habitat is the specific environment where an organism lives, providing the necessary resources like food, water, and shelter for survival and reproduction.

The hierarchy of biological organization in ecology is: organism, population, community, ecosystem. Option B correctly follows this progression from smallest to largest.

Photosynthesis is the process by which autotrophs convert inorganic carbon dioxide into organic glucose, effectively moving carbon into the biotic components of an ecosystem. Cellular respiration performs the opposite function, releasing carbon back into the atmosphere.

Pioneer species, such as lichens or mosses, are hardy organisms capable of surviving in harsh, nutrient-poor conditions. They are the first to inhabit an area after a disaster, helping to build soil for later species.

Carrying capacity is the maximum population size of a biological species that can be sustained in a specific environment, given the food, habitat, water, and other resources available.

Decomposers, such as bacteria and fungi, break down organic matter from dead organisms. This process releases carbon back into the soil and atmosphere, completing the cycle.

A limiting factor is any environmental resource or condition that restricts the growth, abundance, or distribution of a population in an ecosystem.

The climax community is the final, stable stage of ecological succession, where the species composition remains relatively constant until a disturbance occurs.

A habitat is the natural home or environment of an animal, plant, or other organism, defining the geographic limit of its population.

Biotic components (living organisms) rely on abiotic factors (like water, sunlight, and soil) for survival, energy, and resources.