Study "Aqa biology ecology", a flashcard deck on FORKSAI.
Define what an ecosystem is and explain the concept of interdependence within it.
An ecosystem encompasses all the living organisms, such as animals and plants, within a specific area. These organisms form a community where they are all dependent on one another for survival, meaning they cannot exist in isolation. For instance, animals consume plants for sustenance, while plants rely on animals for seed distribution to reproduce.
Distinguish between abiotic and biotic factors, providing examples of each.
Abiotic factors are non-living components that influence organisms, including light intensity, temperature, water levels, pH, iron levels, wind, carbon dioxide levels, and oxygen levels. Biotic factors, conversely, are living components that affect organisms, such as food sources, predators, and pathogens.
Explain how changes in abiotic or biotic factors can have a dramatic impact on a community.
An increase, reduction, removal, or introduction of any abiotic or biotic factor can significantly alter a community. For example, the introduction of a new predator or pathogen could decimate a community. Similarly, a change in temperature can eliminate an organism's food source or make an environment uninhabitable, and insufficient carbon dioxide or oxygen levels can prevent plants and animals from surviving.
Describe the adaptations of cacti that allow them to survive in a desert environment.
Cacti are well-adapted to desert environments due to several features. They possess shallow roots to quickly absorb surface water, have spines to deter herbivores from eating them, and can store water efficiently in their leaves to endure dry periods.
Explain the adaptations of snow foxes that enable them to survive in cold environments.
Snow foxes exhibit several adaptations for cold environments. Their white fur provides camouflage against snow, small ears reduce heat loss by minimizing surface area, and a very thick coat offers excellent insulation against low temperatures.
Describe the fundamental starting point of all food chains.
All food chains originate with the sun, which provides the initial energy. This energy then fuels the growth of organisms, primarily plants, which are subsequently consumed by other organisms, forming the base of the food chain.
Explain the role of plants in a food chain.
Plants are crucial in a food chain as they are the primary producers. They convert the sun's energy into organic matter, which then becomes a food source for other organisms. For example, grass is eaten by cows, or plants like corn are consumed directly or processed into ingredients like corn syrup.
Define the term 'herbivore' and provide an example from the source material.
A herbivore is an animal that exclusively consumes plants. An example provided in the source material is cows, which eat grass.
Identify the essential requirements for a species to survive and reproduce.
For a species to survive and reproduce, it fundamentally requires food, water, and air. Additionally, a mate is sometimes, but not always, necessary for reproduction.
MCQ-STYLE: Which of the following is an example of an abiotic factor?
A