Plant Responses Key Concept Builder LESSON 2 Key Concept

Name
Date
Class
Key Concept Builder
LESSON 2
Plant Responses
Key Concept How do plants respond to environmental stimuli?
Directions: On each blank, write the term or phrase that correctly completes each sentence.
1. Changes in the environment that cause an organism to respond are
called
.
2. Environmental stimuli include
,
, and
.
3. When a response results in plant growth toward or away from a stimulus, the response
is called a(n)
4. A(n)
.
tropism occurs when the growth is toward the stimulus.
5. Growth of a plant toward or away from light is called
6.
.
is a plant’s response to gravity.
7. Another response,
, describes a plant’s response to touch.
8. Vines that coil around a nearby plant are demonstrating
.
9. Flowering plants show a response to darkness called
.
hours of darkness
to flower.
11. A(n)
plant does not seem to be affected by the number of
hours of darkness.
12. Plants that flower in early summer but not in late fall are called
plants.
13. Stems grow away from gravity, and roots grow toward gravity. This
describes
.
14. A stem grows
even when there is no light.
15. Roots growing away from a source of light are examples of
tropism.
16. Leaves tend to grow in the direction of
.
17. The dropping of leaves in the fall is the tree’s response to
stimuli.
18. The tendrils of vines coil as a response to
34
.
Plant Processes and Reproduction
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
10. A short-day plant must have more than
Name
Date
Key Concept Builder
Class
LESSON 2
Plant Responses
Key Concept How do plants respond to environmental stimuli?
Directions: Answer each question in the space provided.
Environmental Stimuli
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
This is the cause.
What is the effect?
1. Sunlight enters a room and
shines on a potted plant near
the window.
1.
2. A seed lands on the soil and
starts to grow.
2.
3. The tendril of a vine touches
the branch of a nearby shrub.
3.
4. Day-neutral plants reach
maturity, and environmental
conditions are right.
4.
5. Short-day plants receive less
than 12 hours of darkness.
5.
6. A potted plant falls on its side
and goes unnoticed.
6.
7. A plant that leans toward the
window is moved outside.
7.
8. A fly lands inside the leaves of
a Venus flytrap.
8.
9. The roots of a plant are pulled
out of the wet soil and left to
lay on the ground.
9.
10. A vine touches the side of a
building.
Plant Processes and Reproduction
What is this response
called?
10.
35
Name
Date
Class
Key Concept Builder
LESSON 2
Plant Responses
Key Concept How do plants respond to chemical stimuli?
Directions: Label the diagram by writing the three responses plants have to each plant hormone.
1. Auxins
2. Ethylene
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
3. Gibberellins
4. Cytokinins
Directions: Answer the question on the lines provided.
5. Why are plant hormones called messengers?
36
Plant Processes and Reproduction
Name
Date
Class
Key Concept Builder
LESSON 2
Plant Responses
Key Concept How do plants respond to chemical stimuli?
Directions: Respond to each statement in the space provided.
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
List four plant hormones.
Explain how the plant
responds to the plant
hormone.
Describe how the response
benefits the plant.
1. Summarize how plant hormones benefit plants.
2. Explain three ways you are dependent on plants.
3. Describe how humans use plant hormones to make plants more productive.
Plant Processes and Reproduction
37