Question

what role does decomposition play in the phosphorus cycle?
a it assists soil bacteria to convert organic phosphorus into phosphates.
b it ensures rocks are broken down so phosphorus is released into water or soil.
c it helps plants absorb phosphorus to be sent to all parts of the plant.
d it allows phosphates that are present in decaying organic matter to enter soil.

Explanation:

• In the phosphorus cycle, decomposition of organic matter (like dead plants and animals) releases phosphates. These phosphates then enter the soil.
• Option A: Soil bacteria convert organic phosphorus to phosphates not mainly through decomposition assisting in that specific conversion (more about bacterial processes).
• Option B: Breaking down rocks (weathering) is a different process from decomposition in terms of phosphorus release.
• Option C: Plant absorption of phosphorus is a separate step after phosphorus is available in the soil (not directly decomposition's role in that absorption).
• Option D: Decomposition of decaying organic matter releases phosphates into the soil which is correct for its role in the phosphorus cycle.

Answer:

D. It allows phosphates that are present in decaying organic matter to enter soil.