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23 Cards in this Set
- Front
- Back
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Which of the following would be the lowest concentration in an actively growing shoot tip? |
Zinc |
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How can you increase the cation exchange and water retention capacity of loamy soil? |
Add clay to the soil |
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What soil is the most fertile? |
both humus and loam |
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Why does overwatering a plant kill it? |
The roots are deprived of oxygen |
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A soil can be amended to reduce minerals from leaching into the water table by adding |
Humus |
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Which of the following soil minerals is most likely leached away during a hard rain? |
NO3- |
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The NPK percentages on a package of fertilizer refer to the |
Percentages of three important mineral nutrients |
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Which of the following best describes the general role of micronutrients in plants? |
They are cofactors in enzymatic reactions |
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Most of the dry weight of a plant is derived from |
H2O and CO2 |
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A growing plant exhibits chlorosis of the leaves. This is probably due to a deficiency of which of the following macronutrients? |
Nitrogen |
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Reddish-purple coloring of leaves, especially along the margins of young leaves, is typical symptom of deficiency of which element? |
P |
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Essential element of chlorophyll |
Magnesium |
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Needed for cell division, plant growth, "buffer" |
Calcium |
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Increases protein content, stimulates root growth |
Sulfur |
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Low levels needed for flavor, sugar content, color intensity |
Copper |
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Aids in moisture absoprtion, increase yield, root and fruit |
Boron |
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Accelerates seed germination, hastens fruiting/ripening of crops |
Manganese |
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Essential to make chlorophyll, protein synthesis, nitrogen fixation |
Iron |
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Nitrogen fixation is a process that |
Converts nitrogen gas into ammonia |
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The end of complex nitrogenase catalyzes the reaction that reduces atmospheric nitrogen to |
NH3 |
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Why is nitrogen fixation an essential process? |
Fixed nitrogen is often the limiting factor in plant growth. |
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Hyphae form a covering over roots. These hypes create a large surface area that helps to do which of the following? |
Aid in absorbing minerals and ions |
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What are epiphytes? |
Plants that grow on other plants but do not obtain nutrients from their hosts |
