BCHS Biology Fall Exam Review 2024

Front

What is genetic drift?

Back

Genetic drift is a mechanism of evolution that involves a change in allele frequency due to random chance, particularly in small populations.

Front

What is an energy pyramid?

Back

An energy pyramid is a graphical representation of the energy available at each trophic level in an ecosystem, showing that energy decreases as you move up the pyramid.

Front

Which organisms are crucial for nitrogen cycling?

Back

Bacteria are the most important organisms for nitrogen cycling, as they convert nitrogen into forms usable by plants.

Front

What is commensalism?

Back

Commensalism is a symbiotic relationship where one organism benefits and the other is unaffected.

Front

What role do decomposers play in the carbon cycle?

Back

Decomposers release carbon into the atmosphere through the process of respiration.

Front

What is the role of producers in an ecosystem?

Back

Producers, such as plants, convert sunlight into energy through photosynthesis, forming the base of the food chain.

Front

What is the difference between herbivores and carnivores?

Back

Herbivores are organisms that eat plants, while carnivores are organisms that eat other animals.

Front

What is the significance of mutation in evolution?

Back

Mutations are changes in DNA that can lead to new traits in organisms, providing raw material for evolution.

Front

What is the process of photosynthesis?

Back

Photosynthesis is the process by which green plants use sunlight to synthesize foods with the help of chlorophyll.

Front

What is the definition of a top predator?

Back

A top predator is an organism that is at the top of the food chain and has no natural predators.