Biogeochemical Cycles and Energy Flow

Front

What is a biogeochemical cycle?

Back

A biogeochemical cycle is the movement of elements and compounds through living organisms and the physical environment, involving biological, geological, and chemical processes.

Front

What are the main components of the carbon cycle?

Back

The main components of the carbon cycle include photosynthesis, respiration, decomposition, combustion, and the exchange of carbon dioxide between the atmosphere and oceans.

Front

What role do bacteria play in the nitrogen cycle?

Back

Bacteria are essential in the nitrogen cycle as they convert atmospheric nitrogen into forms usable by plants (nitrogen fixation) and decompose organic matter to release nitrogen back into the soil.

Front

What is the significance of detritivores in an ecosystem?

Back

Detritivores recycle chemical nutrients by breaking down dead organic matter, returning nutrients to the soil for use by autotrophs.

Front

How much energy is typically transferred from one trophic level to the next in a food chain?

Back

Typically, only about 10% of the energy is transferred from one trophic level to the next, with the rest lost as heat.

Front

What is photosynthesis?

Back

Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll, converting carbon dioxide and water into glucose and oxygen.

Front

Define autotrophs and heterotrophs.

Back

Autotrophs are organisms that produce their own food (e.g., plants), while heterotrophs are organisms that consume other organisms for energy (e.g., animals).

Front

What is the role of producers in an ecosystem?

Back

Producers, such as plants, are organisms that convert solar energy into chemical energy through photosynthesis, forming the base of the food chain.

Front

Explain the term 'trophic level'.

Back

A trophic level is a position in a food chain or food web, representing the flow of energy and nutrients from one level to the next.

Front

What is the water cycle?

Back

The water cycle is the continuous movement of water on, above, and below the surface of the Earth, involving processes like evaporation, condensation, precipitation, and infiltration.