Free SAT Biology Ecology & Behavior Questions and Answers

Question 1

What is an ecosystem?

Accepted Answer

All living and non-living things in an area

Answer

An ecosystem encompasses all the living organisms (biotic factors) and non-living components (abiotic factors) within a specific area. These elements, such as plants, animals, soil, water, and sunlight, interact with each other to form a functional and interconnected system. Therefore, an ecosystem is defined by the interplay between both the biological and physical aspects of an environment.

Question 2

What is the primary source of energy in most ecosystems?

Accepted Answer

The Sun

Answer

The Sun is the fundamental source of energy for nearly all ecosystems on Earth. Through the process of photosynthesis, producers like plants and algae capture solar energy and convert it into chemical energy in the form of organic compounds. This stored energy then forms the base of the food web, making it available to all other organisms in the ecosystem.

Question 3

What is a trophic level?

Accepted Answer

A feeding level in an ecosystem

Answer

A trophic level defines an organism's position in a food chain or food web, indicating how it obtains energy within an ecosystem. Producers (like plants) occupy the first trophic level, followed by primary consumers (herbivores), secondary consumers (carnivores that eat herbivores), and so on. This classification helps illustrate the flow of energy through an ecosystem.

Question 4

What behavior is learned through experience?

Accepted Answer

Learned behavior

Answer

Learned behavior is any behavior acquired or modified through an organism's experiences, observations, or practice during its lifetime. Unlike innate behaviors (reflexes or instincts) which are genetically programmed, learned behaviors allow organisms to adapt to new situations and environments. Examples include training a pet or a child learning to speak.

Question 5

What is the role of decomposers in an ecosystem?

Accepted Answer

Break down organic matter

Answer

Decomposers, primarily bacteria and fungi, play an indispensable role in ecosystems by breaking down dead organic matter, such as dead plants, animals, and waste products. This process releases essential nutrients back into the soil and atmosphere, making them available for producers to reuse. Without decomposers, nutrient cycling would halt, and ecosystems would become choked with waste.

SAT - Biology Subject Test Practice Test

SAT - Biology Subject Test Practice Test

Free SAT Biology Ecology & Behavior Questions and Answers