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Unit 3 Review
Test Description: Unit 3 - Plant systems and homeostasis
Instructions: Answer all questions to get your test result.
1) Which of the following statements would be the stimulus for a plant wilting?
A
Not enough moisture in the air
B
There is not enough sunlight
C
Too much moisture in the air
D
Lack of water inside the plant cells
2) A plant was left by a window for several days. The plant was watered daily. After three days, the plant began to grow towards the window. Which of the following best explains what happened?
A
The plant is responding to water in the air and growing towards it.
B
The plant is responding to the stimulus of sunlight.
C
The plant is leaning towards the window to get fresh air.
D
Heat from the Sun caused the plant to grow towards the window.
3) What purpose does the xylem in a plant serve?
A
Transportation of food and nutrients
B
Anchors the plant in the ground
C
Transportation of water and minerals
D
Transforms energy through photosynthesis
4) In a germinating seed, the downward growth of roots and upward growth of leaves and stems are the plant's responses to -
A
water
B
sunlight
C
osmosis
D
gravity
5) What causes a plant to droop?
A
Excessive humidity
B
Negative homeostasis
C
Response to gravity
D
Lack of turgor pressure
6) On leaf surfaces, guard cells that open and close in response to the amount of water available is an example of -
A
photosynthesis.
B
respiration.
C
homeostasis.
D
constructive feedback.
7) What process causes a plant to wilt in response to too much or too little water?
A
Dehydration
B
Transpiration
C
Photosynthesis
D
Respiration
8) In an experiment two identical plants in identical containers were given equal exposure to sunlight. Plant A received 100 mL of fresh water, plant B received 100 mL of salt water. Which of the following is most likely to happen?
A
Plant A appreared healthy, but Plant B was wilted.
B
Plant A experienced a change in color, but Plant B did not change.
C
Plants A and B both showed significant growth.
D
Plant A was wilted, but Plant B appeared to be healthy.
9) If a plant was knocked on its side and left for several weeks how would the plant's growth change?
A
The stem would continue growing straight while the root growth would turn downward.
B
The stem and root growth would not change.
C
The stem and root growth would both turn upward.
D
The stem growth would begin to turn up and the root growth would begin to turn down.
10) In a germinating seed, the downward growth of roots and upward growth of stems are the plant's responses to gravity. Which statement best describes this phenomenon?
A
Downward growth of roots-positive response to gravity; upward growth of stem-negative response to gravity.
B
Downward growth of roots-positive response to gravity; upward growth of stem-positive response to gravity.
C
Downward growth of roots-negative response to gravity; upward growth of stem-positive response to gravity.
D
Downward growth of roots-negative response to gravity; upward growth of stem-negative response to gravity.
11) Responses in plants that result in movement away from or toward a stimulus are called-
A
yield.
B
adaptations.
C
differentation.
D
tropisms.
12) Based on your knowledge of phototropism, how do you predict plants would grow if they were placed in a solid box with a hole cut in one end.
A
All plants will grow straight up.
B
All plants will grow toward the opening.
C
All plants will grow away from the opening.
D
Plants near the opening will grow toward the opening; all others will grow straight up.
13) What do scientists do to make sure their results are reliable?
A
Discard results that disprove their hypothesis.
B
Repeat investigations many times.
C
Record their data and graph results.
D
Change the investigation to include many variables.
14) If a scientist put a plant in a closed, dark box for many days. Then cut a hole in the box and let the plant grow for many more, what are they most likely testing for?
A
To investigate how the addition of light affects seedlings grown in the dark.
B
To compare the growth of the plant grown in the dark, with those grown in the light.
C
To compare a plant's response to light with a plant's response to gravity.
D
To examine how the color of a light source affects seedlings.
15) If a scientist put a plant in a closed, dark box for many days. Then cut a hole in the box and let the plant grow for many more, what is the purpose of cutting a hole in the box?
A
To maintain a constant temperature in the box.
B
To allow them to check the status of the experiment.
C
To provide an opening for CO2 and O2 exchange.
D
To control the variable for comparison.
*select an answer for all questions
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