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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Definitions:

Snoring

The hoarse or harsh sound that occurs when air flows past relaxed tissues in the throat, causing the tissues to vibrate during sleep.

Weight

A measure of the gravitational force acting on an object, commonly used in various contexts to indicate the heaviness of an object.

Correlation

A numerical indicator showing the degree to which two or more variables move in relation to one another.

Correlation Coefficient

A statistical measure that indicates the extent to which two variables change together, and the strength and direction of their relationship.