JSS2 Basic Science Lesson Note on Nutrient Cycles

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SUB-TOPIC: NUTRIENT CYCLES

Meaning of nutrient cycle in nature

this is the constant circulations of nutrients around the ecosystem. Photosynthesis and respiration drive the movement of oxygen and carbon dioxides to become available all the times.

Water cycle.

We use water every day, where does water comes from, water is found almost everywhere in different forms. Water cycle is the continuous movement of water, from land, rivers and oceans to the atmosphere as vapour and from atmosphere back to land and rivers or oceans as rain.

Nitrogen cycle

We eat food rich in protein such as beans, how does the protein content in it forms? The basic chemical in protein is nitrogen compounds. Nitrogen cycle is the constant flow and replacement of nitrogen in the atmosphere and land and how it gets to plants and animals and back to the soil or atmosphere.

Carbon cycle

One of the most abundant elements in the environment is carbon. It exists in the atmosphere as carbon iv oxides (CO₂). Carbon cycle is the processes by which plants and animals use carbon iv oxide and return it back to the atmosphere. Plants absorbs CO₂ from the atmosphere during photosynthesis and releases it back during respiration. Animals takes in carbon stored in plants as food and release it out during respiration. Carbon is also released into the atmosphere through the burning of fossil fuel.             

Food chain

food chain is the arrangement of organisms serially in order of feeding relationship, food and energy flow.

A simple food chain

Grass         →    goat                     →     man

Producer       primary consumer         secondary consumer

 

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