Bio Chapter 37 – Flashcards
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How do plants obtain organic molecules?
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Plants synthesize their own organic molecules.
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How do prokaryotes contribute to plant health?
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Prokaryotes fix atmospheric nitrogen; Prokaryotes secrete chemicals that stimulate plant growth and protect plant roots from disease.
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Identify the components of the rhizosphere, the soil layer that surrounds plant roots.
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dirt; bacteria; fungi
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The release of CO2 into the soil results in the formation of _____.
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hydrogen ions and carbonate ions
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What process is the source of the CO2 that root hairs release into the soil?
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respiration
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The binding of H+ ions to soil particles _____.
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displaces mineral cations
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Which of these ions is most likely to be leached from the soil?
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chlorine ions
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Acid precipitation _____ soil fertility.
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decreases
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How do cations enter root hairs?
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diffusion
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What are the largest particles formed from the breakdown of rock?
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gravel
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Why is the decomposition of dead organisms important for soil formation?
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The process adds organic matter to the soil, which is necessary to support the growth of larger plants.
