Biology Ecology & Environmental Interactions

Question 1

What is an ecosystem?

Accepted Answer

A community of organisms and their environment

Answer

An ecosystem is a biological community of interacting organisms (biotic factors) and their physical environment (abiotic factors) in a particular area. These living and non-living components interact with each other, forming a complex and interconnected system. This definition highlights the crucial interplay between life and its surroundings.

Question 2

What is a food web?

Accepted Answer

A network of interconnected food chains

Answer

A food web illustrates the complex feeding relationships within an ecosystem, showing how energy flows through multiple interconnected food chains. Unlike a simple food chain, it depicts that most organisms consume and are consumed by more than one type of species. This interconnectedness provides a more realistic representation of energy transfer in nature.

Question 3

What is biodiversity?

Accepted Answer

The variety of life in a habitat or ecosystem

Answer

Biodiversity refers to the variety of life in a particular habitat or ecosystem, encompassing the diversity of genes, species, and ecosystems. It measures the health and resilience of an ecosystem, as greater diversity often leads to greater stability. Protecting biodiversity is crucial for maintaining ecological balance and ecosystem services.

Question 4

What is the greenhouse effect?

Accepted Answer

Gases trapping heat and warming the planet

Answer

The greenhouse effect is a natural process where certain gases in Earth's atmosphere trap heat, preventing it from escaping into space. This trapped heat warms the planet, making it habitable for life. However, increased concentrations of these gases due to human activities are intensifying this effect, leading to global warming.

Question 5

What is a keystone species?

Accepted Answer

A species that greatly affects ecosystem balance

Answer

A keystone species is an organism that plays a unique and crucial role in the way an ecosystem functions. Its removal can trigger a cascade of negative effects, leading to significant changes in the ecosystem's structure and even the extinction of other species. These species are vital for maintaining biodiversity and ecological stability.

Biology Practice Test Practice Test

Biology Practice Test Practice Test

Biology Ecology & Environmental Interactions