Cycles in Biology: Exploring Nutrient and Energy Flow in Ecosystems

Ms. Boghossian introduces the Bio 400 course, emphasizing the use of screencasts for dense material. She explains biological cycles, focusing on the water cycle and nutrient cycles, highlighting the role of decomposers. The interaction between organisms and their environment is discussed, using trees as an example. The food chain and energy flow are detailed, including the 10% rule, which explains energy loss between trophic levels.

What is the primary purpose of using screencasts in this biology class?

• To replace textbooks

• To deliver dense material efficiently

• To provide entertainment

• To reduce class time

Which of the following is NOT a cycle discussed in the screencast?

• Water cycle

• Sulfur cycle

• Oxygen cycle

• Carbon cycle

How does a tree influence its environment?

• By absorbing oxygen

• By providing habitats

• By consuming animals

• By producing carbon dioxide

Which of the following is a byproduct of photosynthesis?

• Sulfur

• Nitrogen

• Oxygen

• Carbon dioxide

What role do decomposers play in the nutrient cycle?

• They break down organic matter

• They consume producers

• They produce energy

• They create new nutrients

What is humus in the context of soil composition?

• A type of plant

• Decomposed organic matter

• A mineral

• A type of fungus

Which organisms are considered producers in a food chain?

• Herbivores

• Carnivores

• Photosynthetic organisms

• Decomposers

What is the 10% rule in the context of energy flow in ecosystems?

• 10% of energy is lost as heat

• 10% of energy is transferred to the next trophic level

• 10% of nutrients are recycled

• 10% of organisms survive each year

Why are there fewer tertiary consumers compared to primary consumers?

• Tertiary consumers are smaller

• Energy transfer is inefficient

• Tertiary consumers reproduce less

• Primary consumers are more aggressive

What happens to the energy that is not transferred to the next trophic level?

• It is stored in the soil

• It is used for metabolic processes and lost as heat

• It is absorbed by the sun

• It is converted into nutrients