Question 1

Which of the following terms describes the functional role and position of a species in its ecosystem?

Accepted Answer

Ecological Niche. An ecological niche encompasses how a species responds to the distribution of resources and competitors. It includes the species' specific biological requirements and its interactions with the environment. Every species in a healthy ecosystem generally occupies a unique niche.

Question 2

What is the primary source of energy for most terrestrial and aquatic ecosystems?

Accepted Answer

Solar radiation. Solar radiation provides the necessary energy for photosynthesis by producers like plants and algae. This light energy is converted into chemical energy that flows through various trophic levels. Without the sun, most life forms on Earth would not be able to sustain themselves.

Question 3

Which of the following is an example of an abiotic component of an ecosystem?

Accepted Answer

Soil pH. Soil pH is a non-living chemical factor that influences the types of plants that can grow in an area. Abiotic components include physical and chemical elements like temperature, sunlight, and water. These factors determine the structure and survival of the biotic community.

Question 4

The transition zone between two distinct ecosystems is known as a/an?

Accepted Answer

Ecotone. An ecotone is an area where two communities meet and integrate, such as a marshland between a river and land. These zones often harbor a higher number of species compared to the adjoining ecosystems. This phenomenon of increased diversity is commonly known as the edge effect.

Question 5

Which organism occupies the first trophic level in a typical grazing food chain?

Accepted Answer

Primary Producers. Primary producers, such as green plants, form the base of the food chain by creating their own food. They use energy from sunlight to synthesize organic compounds from inorganic materials. All subsequent trophic levels depend on the energy captured at this first level.

Ecology & Ecosystems — Set 1