Cycles Of Matter In Ecosystems: Exploring Water Carbon And Nitrogen

The video covers the cycles of matter, focusing on the water, carbon and oxygen, and nitrogen cycles. It begins with the laws of conservation of mass and energy, explaining that matter and energy cannot be created or destroyed. The water cycle is detailed, including evaporation, condensation, and precipitation. The carbon and oxygen cycle is discussed in relation to photosynthesis and respiration, highlighting the role of producers, consumers, and decomposers. The nitrogen cycle is explained, emphasizing nitrogen fixation by bacteria and its role in the ecosystem. Human impacts on these cycles are also mentioned.

What does the law of conservation of mass state?

• Mass can be created or destroyed.

• Mass can change forms but not be created or destroyed.

• Mass is always increasing.

• Mass is only relevant in closed systems.

Which process in the water cycle involves liquid water turning into vapor?

• Transpiration

• Evaporation

• Precipitation

• Condensation

What is transpiration in the water cycle?

• Water turning into ice.

• Water falling as rain.

• Water vapor released from animal waste.

• Water vapor released from plant leaves.

What happens during condensation in the water cycle?

• Liquid water turns into vapor.

• Water falls as precipitation.

• Water vapor turns into liquid.

• Water turns into ice.

What is the role of plants in the carbon and oxygen cycle?

• They only absorb carbon dioxide.

• They only release oxygen.

• They absorb carbon dioxide and release oxygen.

• They release carbon dioxide and absorb oxygen.

How do human activities impact the carbon and oxygen cycle?

• They only affect oxygen levels.

• They have no impact on CO2 levels.

• They increase CO2 levels by burning fossil fuels.

• They decrease CO2 levels by planting trees.

What is the significance of carbon in living organisms?

• It is a waste product.

• It is the building block of all living things.

• It is only found in plants.

• It is not essential for life.

What is the primary role of bacteria in the nitrogen cycle?

• To release nitrogen into the atmosphere.

• To fix nitrogen into a usable form for plants.

• To consume nitrogen from the soil.

• To convert nitrogen into oxygen.

Which natural phenomenon can also fix nitrogen in the atmosphere?

• Wind

• Lightning

• Sunlight

• Rain

What is the final step in the nitrogen cycle?

• Nitrogen is absorbed by plants.

• Nitrogen is fixed by bacteria.

• Nitrogen is released back into the atmosphere.

• Nitrogen is consumed by animals.