When chlorophyll breaks down, ___.

If you plant a tree on the side of a very steep hill, it will ___.

An example of short-day plants are ___.

An example of long-day plants are ___.

A short day plant is one that will ___.

You can cause a chrysanthemum to flower by ___.

When the stomata on a leaf are open, ___ diffuses into the leaf.

Many of a plant's tropisms are in response to ___.

When commercial growers artificially control the length of days and nights to stimulate plants to flower, they are relying on a or an ___.

A change in plant growth in response to the direction of light is called ___.

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