New Oxford Secondary Science Ecology Study Guide
The Fundamental Concept of the Ecosystem
According to the New Oxford Secondary Science, an ecosystem is formed through the continuous and complex interaction between the biotic and abiotic factors of an environment. It is established that biotic factors possess a critical dependency on abiotic factors; without these non-living components, living organisms would be unable to survive. An ecosystem encompasses all the plants and animals living in a specific location, such as a public park, integrated with their physical or non-living surroundings.
The scale and nature of ecosystems can vary significantly, ranging from small-scale environments to vast biomes. Explicit examples provided include a park, an aquarium, a rotting log, an orchard, a desert, and a rainforest. Interestingly, the human body itself serves as a host to ecosystems; for instance, human skin is categorized as a natural ecosystem. Even when skin is considered clean and healthy, it provides a habitat for billions of harmless bacteria and microscopic mites.
Organisms and Global Biodiversity
An individual living thing is scientifically defined as an organism. The Earth serves as a home to a staggering variety of these organisms, and any given area on the planet typically hosts more than one type of organism simultaneously. Current scientific identifications indicate a high level of biodiversity across different kingdoms of life. There are at least different types of plants and at least types of animals inhabiting the world.
Beyond visible flora and fauna, scientists have identified thousands of bacteria and other microscopic living entities known as protists. Specific categorical data for living things include approximately animals, plants, protists, and fungi. This diverse collection of life forms—including animals, plants, bacteria, protists, and fungi—collectively constitutes the biotic segment of the global ecosystem.
Structural Components of the Environment
The environment is defined as everything surrounding a plant or animal, regardless of scale, that affects its specific way of life. The environment is strictly divided into two distinct parts: biotic factors and abiotic factors. The biotic factors, often referred to as the living environment, consist of all living organisms. This include plants, trees, grass, animals, birds, insects, spiders, bacteria, and humans.
In contrast, the abiotic factors comprise the non-living things that form the physical environment. These factors are essential for supporting life and include soil, water, air, temperature, sunlight, wind, and the atmosphere. Climate is also a significant abiotic factor that influences the functioning of the ecosystem. The interaction between these two groups is what sustains life on Earth.
The Oxygen Cycle and Respiration
The oxygen cycle is a vital process that keeps the level of oxygen in the atmosphere constant. Oxygen is an absolute requirement for the process of respiration in almost all living organisms. The atmosphere is composed such that it maintains a concentration of oxygen gas.
Respiration is the biological process through which organisms release energy from food. If organisms are unable to respire, they cannot produce the energy necessary for survival. Within this cycle, both animals and plants participate by breathing in oxygen to facilitate these metabolic functions. This continuous intake and utilization are part of the broader entire process that maintains the balance of life-sustaining gases on Earth.