(Solved) . Figure 31.2 illustrates the team's experimental setup. Pots containing seedlings of three ...

. Figure 31.2 illustrates the team's experimental setup. Pots containing seedlings of three different tree species were set up and grown under natural conditions for three years; two of the three species formed ectomycorrhizae (Douglas fir, birch) and the other (cedar) formed arbuscular mycorrhizae. For the experiment, the researchers placed airtight bags over the Douglas fir and birch seedlings; into each bag, they injected either carbon dioxide made from carbon-13 or carbon-14 (13CO2 and 14CO2, isotopes of carbon). As the seedlings photosynthesized, the radioactive carbon dioxide was converted into radioactively labeled sugars that could be tracked and measured by the researchers.

Figure 31.2

21) Refer to Figure 31.2. Which of the following results would support Simard et al.'s (1997) hypothesis that fungi can move carbon from one plant to another? Hypothesis: Sugars made by one plant during photosynthesis can travel through a mycorrhizal fungus and be incorporated into the tissues of another plant.
A) Carbon-14 is found in the birch seedling's tissues and carbon-13 in the Douglas fir.
B) Carbon-14 is found in the Douglas fir seedling's tissues and carbon-13 in the birch.
C) Either carbon-13 or carbon-14 is found in the fungal tissues.
D) Either carbon-13 or carbon-14 is found in the cedar seedling's tissues.

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. Figure 31.2 illustrates the team's experimental setup. Pots containing seedlings of three ...

Biological Science, Canadian Edition

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