Unformatted text preview: Daily fluctuations do not happen because the leaves usually continue making the carbon dioxide as usual. 4. Explain why nitrogen often limits plant growth even though nitrogen is abundant in our atmosphere. How do plants obtain nitrogen? Nitrogen sometimes limits the earth’s plant growth because nitrogen must be changed through many cycles in order to become productive. It is fixed to nitrate which is more helpful to plants. 5. A soil with very little clay content would be expected to have high levels of positively charged ions like potassium and magnesium. (C) Vocabulary Nitrogen fixation Mycorrhizal fungi Respiration...
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- Spring '08