Plant Responses Content Vocabulary LESSON 2 photoperiodism plant

Name
Date
Class
Content Vocabulary
LESSON 2
Plant Responses
Directions: On each line, write the term from the word bank that correctly replaces the underlined words in each
sentence. NOTE: You may need to change a term to its plural form.
photoperiodism
plant hormone
stimulus
tropism
1. Plants may respond to a change in the environment by
growing toward it or away from it.
2. Seedlings bending toward light and roots curving away
from light are examples of plant growth toward or away
from environmental changes.
3. Due to a response to the number of hours of darkness in
their environment, carnations only flower in the summer,
when the number of daylight hours is greater than the
number of hours of darkness.
4. Auxins, ethylene, gibberellins, and cytokinins are
substances that act as chemical messengers within plants.
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Plant Processes and Reproduction