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Questions and Answers
Which process involves the release of phosphate ions from rocks into the soil?
Which process involves the release of phosphate ions from rocks into the soil?
- Assimilation
- Weathering (correct)
- Decomposition
- Excretion
What role do mycorrhizae play in the phosphorous cycle?
What role do mycorrhizae play in the phosphorous cycle?
They help plants take up phosphate ions.
Phosphate ions are transferred from producers to decomposers.
Phosphate ions are transferred from producers to decomposers.
False (B)
What is one way animals release phosphate ions back into the environment?
What is one way animals release phosphate ions back into the environment?
When plants and animals die, ________ break down organic compounds releasing phosphate back into the soil.
When plants and animals die, ________ break down organic compounds releasing phosphate back into the soil.
Which of the following are considered primary producers in the phosphorous cycle?
Which of the following are considered primary producers in the phosphorous cycle?
What additional source of phosphorus is mentioned that is released by birds?
What additional source of phosphorus is mentioned that is released by birds?
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Study Notes
The Phosphorus Cycle
- The phosphorus cycle describes the movement of phosphorus through the Earth's ecosystems.
- Phosphorus is an essential element for life, it is a key component of DNA, RNA, and ATP.
- The cycle begins with phosphorus stored in rocks.
- Weathering breaks down rocks, releasing phosphate ions into the soil and water.
- Plants absorb phosphate ions through their roots, often with the help of mycorrhizae.
- Animals obtain phosphorus by consuming plants or other animals.
- Animals excrete phosphorus in waste products such as urine and faeces.
- When organisms die, decomposers break down organic matter releasing phosphate back into the soil.
- Phosphorus can also be released from guano (bird droppings).
- Phosphorus is lost from the cycle through sedimentation, where it can remain in the ocean floor for millions of years.
- Humans can affect the phosphorus cycle by mining phosphorus from rocks and using it to produce fertilizer.
Important Processes
- Weathering: Phosphate ions in rocks are released into the soil and water.
- Assimilation: Plants absorb phosphate ions from the soil and water.
- Food Chain: Phosphate is transferred to animals through consumption.
- Excretion: Animals release phosphate ions through waste products.
- Decomposition: Decomposers break down organic matter, releasing phosphate back into the soil.
Key Components
- Producers: Plants and algae
- Consumers: Animals
- Decomposers: Fungi and bacteria
- Guano: Bird droppings
- Rocks: The primary source of phosphorus
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