Unit 3 Review Question Preview (ID: 39848)
Unit 3 - Plant Systems And Homeostasis.
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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-negative response to gravity; upward growth of stem-negative 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-positive response to gravity; upward growth of stem-positive response to gravity.
If a plant was knocked on its side and left for several weeks how would the plant's growth change?
a) The stem growth would begin to turn up and the root growth would begin to turn down.
b) The stem and root growth would not change.
c) The stem and root growth would both turn upward.
d) The stem would continue growing straight while the root growth would turn downward.
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) Plants A and B both showed significant growth.
c) Plant A was wilted, but Plant B appeared to be healthy.
d) Plant A experienced a change in color, but Plant B did not change.
What process causes a plant to wilt in response to too much or too little water?
a) Transpiration
b) Photosynthesis
c) Respiration
d) Dehydration
On leaf surfaces, guard cells that open and close in response to the amount of water available is an example of -
a) homeostasis.
b) photosynthesis.
c) constructive feedback.
d) respiration.
What causes a plant to droop?
a) Lack of turgor pressure
b) Response to gravity
c) Negative homeostasis
d) Excessive humidity
In a germinating seed, the downward growth of roots and upward growth of leaves and stems are the plant's responses to -
a) gravity
b) sunlight
c) osmosis
d) water
What purpose does the xylem in a plant serve?
a) Transportation of water and minerals
b) Transportation of food and nutrients
c) Anchors the plant in the ground
d) Transforms energy through photosynthesis
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 the stimulus of sunlight.
b) Heat from the Sun caused the plant to grow towards the window.
c) The plant is leaning towards the window to get fresh air.
d) The plant is responding to water in the air and growing towards it.
Which of the following statements would be the stimulus for a plant wilting?
a) Lack of water inside the plant cells
b) Not enough moisture in the air
c) There is not enough sunlight
d) Too much moisture in the air
Responses in plants that result in movement away from or toward a stimulus are called-
a) tropisms.
b) differentation.
c) adaptations.
d) yield.
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 toward the opening.
b) All plants will grow straight up.
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.
What do scientists do to make sure their results are reliable?
a) Repeat investigations many times.
b) Discard results that disprove their hypothesis.
c) Record their data and graph results.
d) Change the investigation to include many variables.
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 examine how the color of a light source affects seedlings.
c) To compare the growth of the plant grown in the dark, with those grown in the light.
d) To compare a plant's response to light with a plant's response to gravity.
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 control the variable for comparison.
b) To maintain a constant temperature in the box.
c) To allow them to check the status of the experiment.
d) To provide an opening for CO2 and O2 exchange.
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