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Fertilisers and Nutrient Cycles in Ecosystems

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Fertilisers and Nutrient Cycles in Ecosystems

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Questions and Answers

Why are fertilisers needed in an ecosystem?

To reduce the efficiency of energy transfer in the ecosystem.

To replace lost nutrients from the soil when crops are harvested or livestock is removed. (correct)

To prevent the growth of algae in ponds and rivers.

To limit the productivity of agricultural land.

Which type of fertilisers can lead to leaching of nutrients into waterways?

Artificial fertilisers

Inorganic fertilisers (correct)

Organic fertilisers

Natural fertilisers

What environmental issue can arise from the leaching of fertilisers into waterways?

Climate change

Desertification

Eutrophication (correct)

Deforestation

What happens when nutrients are removed from the soil and incorporated into biomass?

The nutrients are not released back into the soil through decomposition. Signup and view all the answers

How do organic fertilisers like manure differ from inorganic fertilisers?

Organic fertilisers allow for precise control of nutrient content compared to inorganic fertilisers. Signup and view all the answers

What is one consequence of leaching due to excess fertiliser application?

Eutrophication Signup and view all the answers

Why are natural fertilisers like compost considered environmentally friendly?

They help reduce the need for synthetic chemicals. Signup and view all the answers

What is a primary reason for using artificial fertilisers over natural fertilisers?

Natural fertilisers cannot be controlled for exact nutrient content. Signup and view all the answers

What impact does leaching of water-soluble compounds from excessive fertilizer use have on aquatic ecosystems?

Eutrophication causing algal blooms and oxygen depletion. Signup and view all the answers

How does the use of organic fertilizers like manure differ from synthetic fertilizers in terms of cost and nutrient control?

Organic fertilizers are more expensive but allow for precise nutrient control compared to synthetic ones. Signup and view all the answers

What is the term for the process where rain or irrigation systems wash water-soluble compounds out of soil into waterways?

Leaching Signup and view all the answers

What is the consequence of an algal bloom in ponds and rivers?

Blocking of light reaching plants below Signup and view all the answers

Why is leaching less likely with natural fertilisers compared to synthetic ones?

Organic molecules in natural fertilisers are less soluble in water Signup and view all the answers

What happens to aquatic organisms when the oxygen concentration in water decreases?

They die due to lack of dissolved oxygen for aerobic respiration Signup and view all the answers

How does leaching impact species diversity in an ecosystem?

It reduces species diversity by favoring fast-growing plants like grass and nettles Signup and view all the answers