Chapter 5 Qs

Chapter 5 Qs - Daily fluctuations do not happen because the...

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Chapter 5 Questions 1. The wood of a tree is made mostly of material derived from the nutrients in the soil that enters the plant through the roots. (A) 2. Carbon dioxide is released from soil through soil respiration. (E) 3. Explain why there are seasonal fluctuations in the concentration of atmospheric CO 2 ? Would you also expect daily fluctuations? Why? There are seasonal fluctuations in the concentration of atmospheric CO 2 because of the reduction and inflation of demands for carbon dioxide. During the fall, trees lose their leaves and stop photosynthesizing. Thus, the carbon dioxide produced greatly reduces. When trees grow new leaves in the spring, carbon dioxide increases considerably.
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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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