Question 1

Trace the flow of a water molecule that is used during photosynthesis.

Accepted Answer

A)  stoma → xylem → root hair → mycorrhiza
B)  soil → root hair → xylem → stoma → atmosphere
C)  soil → root hair → xylem → leaf cell
D)  soil → xylem → leaf cell → atmosphereE) None of the above
F) A) and C)

Question 2

The figure below shows plants grown in the dark,and illustrates ________ in plants.

Accepted Answer

A)  photoperiod
B)  gravitropism
C)  thigmotropism
D)  phototropismE) B) and D)
F) C) and D)

Question 3

Which of the following mechanisms best explains how xylem sap moves up against the downward pull of gravity?

Accepted Answer

A)  cohesion-tension hypothesis
B)  gravitropism
C)  phototropism
D)  expenditure of ATPE) C) and D)
F) B) and C)

Question 4

A farmer decides she wants to grow certified organic corn and sets out to meet all USDA standards to do so.Her crop grows well for the first 3 years; however,she notices during the 4th and 5th years that plants are getting smaller and producing much less corn.She has not altered farming practices and begins to wonder what is happening.She remembers someone mentioning planting peanuts every 3rd year in place of a corn crop,which leads to much healthier corn.Why would a farmer want to change to a different crop,especially something like peanuts?

Accepted Answer

A)  Planting a legume like peanuts increases water retention in the soil,allowing the following year's corn crop to thrive.
B)  Crop rotation with a legume like peanuts will increase nitrogen in the soil,reducing the need for chemical fertilizer.
C)  Planting a legume like peanuts increases the available carbon in the soil.
D)  Changing from corn to peanuts,a legume,allows the soil to "rest" for a year.E) A) and D)
F) All of the above

Question 5

A scientist finds seeds of an unknown plant on top of the soil in a desert.She measures the concentration of two hormones in these seeds.After it rains,she collects more of these seeds,and finds that the concentration of the two hormones has changed.A graph of her results is shown above.If the scientist returns to the desert to collect more seeds,a few days later,what should she observe?

Accepted Answer

A)  The seeds that are still in the desert will be dormant.
B)  The seeds that are still in the desert will be germinating.
C)  The seeds that are still in the desert will be dead.
D)  The seeds that are still in the desert will have increased levels of hormones 1 and 2.E) None of the above
F) A) and B)

Question 6

Which of the following explains how phloem sap moves within a plant?

Accepted Answer

A)  cohesion-tension mechanism
B)  gravity pulls the phloem sap down
C)  pressure-flow mechanism
D)  transpirationE) B) and C)
F) A) and D)

Question 7

Early in the spring,cherry trees produce flowers,even before their leaves develop,by using sugars that were stored in their roots the previous year.While cherry flowers are developing,we would expect the phloem pressure near flowers to be ________,and ________ near root storage cells.

Accepted Answer

A)  high… high
B)  high… low
C)  low… low
D)  low… highE) C) and D)
F) All of the above

Question 8

If Wents placed his agar blocks only halfway on the cut surfaces of grass shoots with their tips removed,what should he have observed?

Accepted Answer

A)  The grass shoot would not grow toward a light.
B)  The grass shoot would grow toward a light when the agar block was on the side of the grass that was facing the light.
C)  The grass shoot would grow toward a light when the agar block was on the side of the grass that was shaded from the light.
D)  The grass shoot would grow toward a light no matter which direction the light was coming from.E) All of the above
F) B) and C) C

Question 9

Which of the following best describes the mechanism that causes stomata to open?

Accepted Answer

A)  Water accumulates below the opening and eventually causes the stoma to open.
B)  A large bubble of oxygen accumulates below the stoma and eventually causes it to open.
C)  Two guard cells flanking each stoma control its opening by changing shape.
D)  The internal pressure of xylem sap expands the leaf,stretching the stoma open.E) A) and B)
F) All of the above

Question 10

Which of the following best describes night-neutral plants?

Accepted Answer

A)  The plants flower at night.
B)  Plants tend to flower when nights become longer.
C)  Plants tend to flower when nights become shorter.
D)  The flowering in these plants is not affected by photoperiod.E) A) and C)
F) B) and C)

Question 11

Which of the following best describe(s) the dependencies of most flowering plants? I) Many depend on insects or other animals for pollination.
II) Many depend on insects or other animals for seed dispersal.
III) Many depend on fungi to help them acquire nutrients.

Accepted Answer

A)  I
B)  II
C)  I and III
D)  I,II,and IIIE) A) and B)
F) All of the above

Question 12

If Paal grew his plants using a light source that was directly overhead,what should he have observed?

Accepted Answer

A)  The grass shoot would not grow.
B)  The grass shoot would grow upward and straight.
C)  The grass shoot would grow in the opposite direction from the side with the tip covering the cut surface.
D)  The grass shoot would grow in the same direction as the side with the tip covering the cut surface.E) B) and C)
F) A) and B)

Question 13

Which of the following BEST describes the essential difference between plant and animal nutrition?

Accepted Answer

A)  Plants use inorganic substances and energy from the sun to produce their own food.
B)  Plants use organic substances to produce their own food.
C)  Plants absorb food through their roots.
D)  Plant and animal nutrition are essentially the same.E) None of the above
F) B) and C) A

Question 14

What does a plant gain from a mycorrhizal relationship?

Accepted Answer

A)  It allows roots to absorb water and solutes more rapidly.
B)  It increases the surface area for photosynthesis.
C)  It helps to break down complex molecules in the soil to release micronutrients.
D)  It helps to break down decaying organic matter into essential plant nutrients.E) B) and C)
F) C) and D)

Question 15

Experimental plants that were sent up in space shuttle missions did not exhibit all of their normal tropisms.Which of the following responses would you most expect to be lacking from these plants?

Accepted Answer

A)  gravitropism
B)  photoperiod
C)  thigmotropism
D)  phototropismE) None of the above
F) B) and D)

Question 16

A location in a plant where sugar is being received for storage or consumption is ________.

Accepted Answer

A)  a sugar sink
B)  a sugar source
C)  phloem sap
D)  phloem tubeE) A) and D)
F) A) and B) A

Question 17

Which of the following is exemplified by a pea tendril contacting a string or wire and coiling around it for support?

Accepted Answer

A)  gravitropism
B)  photoperiod
C)  thigmotropism
D)  phototropismE) All of the above
F) None of the above

Question 18

Which of the following weather conditions would cause transpiration to be most rapid?

Accepted Answer

A)  hot,humid weather
B)  cold,humid weather
C)  hot,dry weather
D)  windy,wet weatherE) B) and D)
F) A) and B)

Question 19

The figure below shows plants originally grown in the dark,and then a light is added on one side only (arrow) .Predict the response of the plants to the addition of the light source.

Accepted Answer

A)  Auxin becomes concentrated on the lighted side of the plants,and the plants begin to grow toward the light.
B)  Auxin becomes concentrated on the darker side of the plants,and the plants begin to grow toward the light.
C)  Auxin becomes concentrated on the lighted side of the plants,and the plants begin to grow away from the light.
D)  Auxin becomes concentrated on the darker side of the plants,and the plants begin to grow away from the light.E) B) and C)
F) A) and B)

Question 20

Which of the following best describes the conversion that occurs during nitrogen fixation?

Accepted Answer

A)  ammonium to nitrate
B)  nitrate to ammonium
C)  nitrogen to ammonium
D)  nitrogen to ammonium or nitrateE) B) and D)
F) A) and D)

Exam 29: The Working Plant

Trace the flow of a water molecule that is used during photosynthesis.

Correct Answer
verified

The figure below shows plants grown in the dark,and illustrates ________ in plants.

Correct Answer
verified

Which of the following mechanisms best explains how xylem sap moves up against the downward pull of gravity?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which of the following explains how phloem sap moves within a plant?

Correct Answer
verified

Early in the spring,cherry trees produce flowers,even before their leaves develop,by using sugars that were stored in their roots the previous year.While cherry flowers are developing,we would expect the phloem pressure near flowers to be ,and near root storage cells.

Correct Answer
verified

If Wents placed his agar blocks only halfway on the cut surfaces of grass shoots with their tips removed,what should he have observed?

Correct Answer
verified
C

Which of the following best describes the mechanism that causes stomata to open?

Correct Answer
verified

Which of the following best describes night-neutral plants?

Correct Answer
verified

Which of the following best describe(s) the dependencies of most flowering plants? I) Many depend on insects or other animals for pollination. II) Many depend on insects or other animals for seed dispersal. III) Many depend on fungi to help them acquire nutrients.

Correct Answer
verified

If Paal grew his plants using a light source that was directly overhead,what should he have observed?

Correct Answer
verified

Which of the following BEST describes the essential difference between plant and animal nutrition?

Correct Answer
verified
A

What does a plant gain from a mycorrhizal relationship?

Correct Answer
verified

Experimental plants that were sent up in space shuttle missions did not exhibit all of their normal tropisms.Which of the following responses would you most expect to be lacking from these plants?

Correct Answer
verified

A location in a plant where sugar is being received for storage or consumption is ________.

Correct Answer
verified
A

Which of the following is exemplified by a pea tendril contacting a string or wire and coiling around it for support?

Correct Answer
verified

Which of the following weather conditions would cause transpiration to be most rapid?

Correct Answer
verified

The figure below shows plants originally grown in the dark,and then a light is added on one side only (arrow) .Predict the response of the plants to the addition of the light source.

Correct Answer
verified

Which of the following best describes the conversion that occurs during nitrogen fixation?

Correct Answer
verified

Exam 29: The Working Plant

Trace the flow of a water molecule that is used during photosynthesis.

Correct AnswerverifiedShow Answer

The figure below shows plants grown in the dark,and illustrates ________ in plants.

Correct AnswerverifiedShow Answer

Which of the following mechanisms best explains how xylem sap moves up against the downward pull of gravity?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following explains how phloem sap moves within a plant?

Correct AnswerverifiedShow Answer

Early in the spring,cherry trees produce flowers,even before their leaves develop,by using sugars that were stored in their roots the previous year.While cherry flowers are developing,we would expect the phloem pressure near flowers to be ________,and ________ near root storage cells.

Correct AnswerverifiedShow Answer

If Wents placed his agar blocks only halfway on the cut surfaces of grass shoots with their tips removed,what should he have observed?

Correct AnswerverifiedC

Which of the following best describes the mechanism that causes stomata to open?

Correct AnswerverifiedShow Answer

Which of the following best describes night-neutral plants?

Correct AnswerverifiedShow Answer

Which of the following best describe(s) the dependencies of most flowering plants? I) Many depend on insects or other animals for pollination. II) Many depend on insects or other animals for seed dispersal. III) Many depend on fungi to help them acquire nutrients.

Correct AnswerverifiedShow Answer

If Paal grew his plants using a light source that was directly overhead,what should he have observed?

Correct AnswerverifiedShow Answer

Which of the following BEST describes the essential difference between plant and animal nutrition?

Correct AnswerverifiedA

What does a plant gain from a mycorrhizal relationship?

Correct AnswerverifiedShow Answer

Experimental plants that were sent up in space shuttle missions did not exhibit all of their normal tropisms.Which of the following responses would you most expect to be lacking from these plants?

Correct AnswerverifiedShow Answer

A location in a plant where sugar is being received for storage or consumption is ________.

Correct AnswerverifiedA

Which of the following is exemplified by a pea tendril contacting a string or wire and coiling around it for support?

Correct AnswerverifiedShow Answer

Which of the following weather conditions would cause transpiration to be most rapid?

Correct AnswerverifiedShow Answer

The figure below shows plants originally grown in the dark,and then a light is added on one side only (arrow) .Predict the response of the plants to the addition of the light source.

Correct AnswerverifiedShow Answer

Which of the following best describes the conversion that occurs during nitrogen fixation?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Early in the spring,cherry trees produce flowers,even before their leaves develop,by using sugars that were stored in their roots the previous year.While cherry flowers are developing,we would expect the phloem pressure near flowers to be ,and near root storage cells.

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified