The Ideal Christmas Tree Has a Conical Shape

question 74

Multiple Choice

The ideal Christmas tree has a conical shape. The top of the tree is pointed and narrow, with clear apical dominance, and the bottom of the tree is wide, with extensive lateral branching. Certain evergreen species are suitable for use as Christmas trees because they have this shape normally and thus require little pruning or training as they grow. For example, spruces and firs are often grown as Christmas trees, whereas yews and longleaf pines are not. Based on this information, tree shape is likely due to:

• A)low levels of auxins near the top and low levels of cytokinins at the bottom of the tree.
• B)low levels of auxins near the top and high levels of cytokinins at the bottom of the tree.
• C)high levels of auxins near the top and high levels of cytokinins at the bottom of the tree.
• D)high levels of auxins near the top and low levels of cytokinins at the bottom of the tree.

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