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How do plants obtain organic molecules?

Plants synthesize their own organic molecules.

How do prokaryotes contribute to plant health?

Prokaryotes fix atmospheric nitrogen; Prokaryotes secrete chemicals that stimulate plant growth and protect plant roots from disease.

Identify the components of the rhizosphere, the soil layer that surrounds plant roots.

dirt; bacteria; fungi

The release of CO2 into the soil results in the formation of _____.

hydrogen ions and carbonate ions

What process is the source of the CO2 that root hairs release into the soil?

respiration

The binding of H+ ions to soil particles _____.

displaces mineral cations

Which of these ions is most likely to be leached from the soil?

chlorine ions

Acid precipitation _____ soil fertility.

decreases

How do cations enter root hairs?

diffusion

What are the largest particles formed from the breakdown of rock?

gravel

Why is the decomposition of dead organisms important for soil formation?

The process adds organic matter to the soil, which is necessary to support the growth of larger plants.

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