Nutrient Cycling and Ecosystem Dynamics

The video explains nutrient cycling in ecosystems, focusing on three main nutrient stores: biomass, litter, and soil. Nutrients move between these stores through processes like decomposition and are influenced by external factors such as deforestation and rainfall. Weathering and leaching also play roles in nutrient dynamics, affecting soil composition. The video emphasizes the constant movement and transformation of nutrients within ecosystems.

What are the three main stores of nutrients in an ecosystem?

• Rocks, Water, Air

• Water, Air, Soil

• Biomass, Litter, Soil

• Plants, Animals, Microorganisms

Which of the following best describes the biomass store?

• It consists of all living things, such as plants and animals.

• It is made up of dead organic matter.

• It is the layer of soil beneath the surface.

• It is the water content in an ecosystem.

What is the litter store primarily composed of?

• Living plants and animals

• Water and air

• Dead organic material from plants and animals

• Minerals and rocks

How do nutrients move from litter to soil?

• By decomposition

• Through photosynthesis

• Through transpiration

• Via evaporation

What process can add nutrients to the soil?

• Transpiration

• Evaporation

• Weathering of rocks

• Photosynthesis

How can deforestation affect the biomass store?

• It decreases the biomass by removing trees.

• It converts biomass into litter.

• It increases the biomass by adding more trees.

• It has no effect on the biomass.

What is the effect of light rainfall on the litter store?

• It converts litter into biomass.

• It adds nutrients to the litter.

• It has no effect on the litter.

• It removes nutrients from the litter.

What is leaching in the context of nutrient cycling?

• The decomposition of organic matter

• The conversion of biomass into litter

• The removal of nutrients from the soil by water

• The process of adding nutrients to the soil

Which process can lead to the loss of nutrients from the soil?

• Transpiration

• Leaching

• Condensation

• Photosynthesis

What role does weathering play in nutrient cycling?

• It converts litter into biomass.

• It removes nutrients from the soil.

• It adds nutrients to the soil.

• It has no role in nutrient cycling.