Mrs. Keadle JH Science
Name__________________________________ period _____
date assigned_____________ date due ______________ date returned _____________
Forces in Living Things Lab
Lab 1: Emergence of Seedlings
Using the power point, label the diagram of the bean seed and the bean seedling.
3. Plants need carbon dioxide, water and sunlight to complete the process of _____________________
4. What forces are acting on the bean seed and seedling?
5. Does the bean seed/seedling show motion? ___________________________________
6. Is work (in the science definition) happening?__________________________________
7. Describe in detail what happened to the bean seed. If yours did not sprout, observe one that did.
1
Forces In Living Things
Mrs. Keadle JH Science
Lab 2: Geotropism
Diagram and label the petri dish set-up in the first box. Add arrows to show your hypothesis on how
each seed will sprout. After a few days, diagram the petri dish again.
Hypothesis
After
8. Describe the direction in which the roots of the seeds grew.
9. Why do roots grow down?
10. What force are the roots responding to?
11. Can you detect any motion? _________________________
12. Is work taking place? ________________________________
13. Predict how you think roots would grow in space and microgravity?
2
Forces In Living Things
Mrs. Keadle JH Science
Lab 3: Turgor Pressure
14. Describe the differences between the two strips
15. What force caused these changes?
16. Explain how the salt water affected the cells within the potato strip.
17. Explain how the fresh water affected the cells within the potato strip.
18. Knowing what you do about turgor pressure, why do you think grocery stores spray water on their
vegetables each day?
3
Forces In Living Things
Mrs. Keadle JH Science
19
20
Scientists working in space would
most likely be studying the effects
of which of the following on plant
growth?
A
friction
B
gravity
C
wind
D
temperature
What is a stimulus?
F
a change in an organism's
surroundings that causes the
organism to respond
G
a violent disturbance in the
atmosphere
H
clouds that form in flat layers
J
the opening on the underside
of most leaves
21
If the top portion of plants grow
“up”, explain why a small tree on a
hillside does not grow straight out
from the hillside.
A
The tree is growing toward
water.
B
The tree is resting on the
hillside.
C
The tree is leaning toward the
top of the hill so rain won’t
wash it off.
D
The tree’s roots and trunk are
growing in response to gravity.
22 What caused this plant’s
behavior?
F
gravitropism
G
thigmotropism
H
lack of turgor pressure
J
negative homeostasis
4
Forces In Living Things
Mrs. Keadle JH Science
The diagram illustrates a seed germinating. Many forces, including responses to
moisture, light, temperature and gravity are at work in this process. Use the
diagram to answer the next two questions.
23
24
Which of the following correctly describes two of the seedling’s response to
stimuli?
A
I is negative to light, and III is positive to gravity.
B
IV is negative to temperature, and II is negative to gravity.
C
II is negative to light, and III is positive to gravity.
D
II is positive to gravity, and IV is positive to moisture.
Which part of the seedling is demonstrating a negative response to gravity
and which is showing a positive response to gravity?
F
I is negative and III is positive.
G
IV is negative and II is positive.
H
II is negative and III is positive.
J
III is negative and IV is positive.
5
Forces In Living Things
Mrs. Keadle JH Science
25
26
In a germinating seed, the downward growth of roots and upward growth of
leaves and stems are the plant’s response to ________________________.
A
sunlight
B
gravity
C
osmosis
D
water
A venus fly trap closing in
response to a fly is an example
of
27 An organism that grows or
moves away from light or any
other stimulus is said to show
F
phototropism
A
positive tropism
G
thigmostropism
B
photosynthesis
H
hydrotropism
C
negative hormones
J
gravitropism
D
negative tropism
6
Forces In Living Things
Mrs. Keadle JH Science
28
29
Marcia places her plant near the window for one week. She waters the plant
every day. What will happen to the plant after one week?
F
it's leaves and flowers will stay the same
G
it's leaves and flowers will grow toward the floor
H
it's leaves and flowers will grow toward the light in the window
J
it's leaves and flowers will grow away from the light in the window
A scientist planted two morning glory vines. He put a stake near the first
vine. The first vine grew upward, coiling around the stake, while the second
vine grew low to the ground. Why did only the first vine grow upward?
A
it responded positively to the stimulus of touching the stake
B
it responded more strongly to light than the second vine
C
it responded less strongly to gravity than the second vine
D
it responded negatively to the stimulus of touching the ground
7
Forces In Living Things
Mrs. Keadle JH Science
Plant Responses Mini-Posters
Directions:
Pick one of the six plant responses we have talked about this week.
phototropism
emergence of seedlings
turgor pressure
gravitropism
thigmotropism
hydrotropism
1. On a separate piece of paper you get from the teacher, draw a picture that will explain the
plant response.
2. Write the name of the tropism at the top of the page.
3. Write the definition somewhere on the front.
4. Label the forces acting on the plant and draw arrows to show which direction the force or
forces are acting in.
8
Forces In Living Things