Question 1

Which of the following statements about plants grown in hydroponic culture is true?

Accepted Answer

A)  They no longer need to transport water through their xylem.
B)  They cannot be used for commercial purposes.
C)  They rarely get enough micronutrients.
D)  They are unable to photosynthesize.
E)  They are suspended with their roots in a nutrient solution.F) B) and C)
G) B) and E)

Question 2

A plant with 80 available ATP could produce 10 molecules of NH3.

Accepted Answer

A) True 
 B)False

Question 3

What makes a mineral element essential for plant growth?

Accepted Answer

A)  It is part of typical chemical fertilizers.
B)  It can only be found in organic fertilizers.
C)  If it is missing,the plant cannot grow or reproduce normally.
D)  As its concentration increases,the plant grows more.
E)  It contributes to the solute potential of the plant.F) A) and B)
G) C) and E) C

Question 4

If increased CO2 concentrations result in plant tissue that is less nutritious,which of these is not a potential consequence for insect herbivores?

Accepted Answer

A)  They must eat more tissue.
B)  Their development may be slowed.
C)  They grow fatter because their diet has more carbohydrates.
D)  They use up more energy trying to eat for food.
E)  Their reproductive cycles may be disrupted because their rate of growth changes.F) A) and E)
G) A) and B)

Question 5

Although symbiotic relationships between nitrogen-fixing bacteria and plants are rare,many plants have symbiotic relationships with

Accepted Answer

A)  other plants.
B)  nematode worms in the soil.
C)  filamentous algae.
D)  mycorrhizal fungi in the soil.
E)  soil insects.F) D) and E)
G) A) and B)

Question 6

Which of the following is most limiting for plant growth,especially in relation to the plant's carbon uptake?

Accepted Answer

A)  phosphorous
B)  potassium
C)  nitrogen
D)  calcium
E)  magnesiumF) A) and E)
G) C) and D)

Question 7

In several studies of plant responses to elevated CO2 concentrations in the atmosphere,scientists often found that the stimulation of growth gradually diminished because

Accepted Answer

A)  more photorespiration occurred.
B)  C3 plants were replaced with C4 plants.
C)  the soil did not contain sufficient nitrogen and other nutrients to support the enhanced growth.
D)  the plants could not store the extra biomass.
E)  weedy plants took over the experimental plots.F) C) and E)
G) A) and B)

Question 8

Which of the following is required by plants in the smallest quantity?

Accepted Answer

A)  boron
B)  potassium
C)  phosphorus
D)  nitrogen
E)  sulfurF) A) and C)
G) A) and B)

Question 9

Saline soils have a higher water potential than plant roots.

Accepted Answer

A) True 
 B)False  False

Question 10

The Nod factor is an important component of

Accepted Answer

A)  the formation of the digestive enzymes of carnivorous plants.
B)  legume-bacterial interactions.
C)  mycorrhizal-terrestrial plant interactions.
D)  the Calvin Cycle.
E)  trichloroethylene metabolism.F) B) and C)
G) None of the above

Question 11

Blocking the proton pumps in a root would result in a more negative membrane potential and an increase in K+ uptake.

Accepted Answer

A) True 
 B)False

Question 12

Which of these is considered a potentially dangerous heavy metal contaminant in soil?

Accepted Answer

A)  cadmium
B)  iron
C)  copper
D)  molybdenum
E)  zincF) A) and D)
G) A) and C)

Question 13

A magnesium deficiency would impact the light-independent reactions but not the light-dependent reaction of photosynthesis.

Accepted Answer

A) True 
 B)False

Question 14

Inside nitrogen-fixing nodules,one N2 molecule is converted into two

Accepted Answer

A)  N) 
B)  NO.
C)  NO2.
D)  NO3.
E)  NH3.F) A) and E)
G) C) and E)

Question 15

A plant cell with 64 available ATP molecules could split how many N2 molecules with the assistance of nitrogenase?

Accepted Answer

A)  2
B)  4
C)  16
D)  32
E)  64F) B) and E)
G) A) and B)

Question 16

Which of these insectivorous plants does not use an active trapping mechanism?

Accepted Answer

A)  pitcher plants
B)  Venus flytraps
C)  sundews
D)  the aquatic waterwheel
E)  bladderwortsF) B) and E)
G) All of the above

Question 17

During the initiation of nitrogen-fixation nodules,a host plant with genetic mutations releases altered forms of flavonoids.What is the likely consequence of this?

Accepted Answer

A)  Infection threads will grow in the wrong direction.
B)  More nodules will form than necessary.
C)  The bacteria will not produce any Nod factors.
D)  Nodules will be misshapen.
E)  The bacterial will produce higher levels of Nod factors.F) C) and D)
G) A) and D)

Question 18

Heavy metals in contaminated soils can be taken up by hyperaccumulating plants.Lead and cadmium taken up this way are often accumulated in the plants'

Accepted Answer

A)  rhizomes.
B)  trichomes.
C)  stomates.
D)  sclerenchyma.
E)  root nodules.F) B) and D)
G) B) and E)

Question 19

Which of the following is a natural process of plants that can be used by humans to remove toxins from soils? Check all that apply.

Accepted Answer

A)  secretion of a substance from the roots that breaks down the toxic chemical
B)  "storage" of a toxic chemical in plant tissues,which are then removed from the site
C)  root pressure pushing toxins from deep in the soil towards the surface
D)  physiological breakdown of the chemical into harmless products
E)  transport of toxins absorbed by the roots into the shoots,where they can be collected more easilyF) D) and E)
G) A) and B)

Question 20

In magnesium-deficient plants the older leaves show more severe symptoms of chlorosis which is a yellowing of the leaves than younger leaves.What is the best explanation?

Accepted Answer

A)  There is more time for the symptoms to develop in older leaves.
B)  Chlorophyll is transported from the older leaves to the younger leaves.
C)  Magnesium is more soluble in younger leaves.
D)  Scarce magnesium is removed from older leaves and translocated to support younger,more active leaves.
E)  Older leaves need less chlorophyll.F) A) and E)
G) A) and B) D

Exam 37: Plant Nutrition and Soils

Which of the following statements about plants grown in hydroponic culture is true?

Correct AnswerverifiedShow Answer

A plant with 80 available ATP could produce 10 molecules of NH3.

Correct AnswerverifiedShow Answer

What makes a mineral element essential for plant growth?

Correct AnswerverifiedC

If increased CO2 concentrations result in plant tissue that is less nutritious,which of these is not a potential consequence for insect herbivores?

Correct AnswerverifiedShow Answer

Although symbiotic relationships between nitrogen-fixing bacteria and plants are rare,many plants have symbiotic relationships with

Correct AnswerverifiedShow Answer

Which of the following is most limiting for plant growth,especially in relation to the plant's carbon uptake?

Correct AnswerverifiedShow Answer

In several studies of plant responses to elevated CO2 concentrations in the atmosphere,scientists often found that the stimulation of growth gradually diminished because

Correct AnswerverifiedShow Answer

Which of the following is required by plants in the smallest quantity?

Correct AnswerverifiedShow Answer

Saline soils have a higher water potential than plant roots.

Correct AnswerverifiedFalse

The Nod factor is an important component of

Correct AnswerverifiedShow Answer

Blocking the proton pumps in a root would result in a more negative membrane potential and an increase in K+ uptake.

Correct AnswerverifiedShow Answer

Which of these is considered a potentially dangerous heavy metal contaminant in soil?

Correct AnswerverifiedShow Answer

A magnesium deficiency would impact the light-independent reactions but not the light-dependent reaction of photosynthesis.

Correct AnswerverifiedShow Answer

Inside nitrogen-fixing nodules,one N2 molecule is converted into two

Correct AnswerverifiedShow Answer

A plant cell with 64 available ATP molecules could split how many N2 molecules with the assistance of nitrogenase?

Correct AnswerverifiedShow Answer

Which of these insectivorous plants does not use an active trapping mechanism?

Correct AnswerverifiedShow Answer

During the initiation of nitrogen-fixation nodules,a host plant with genetic mutations releases altered forms of flavonoids.What is the likely consequence of this?

Correct AnswerverifiedShow Answer

Heavy metals in contaminated soils can be taken up by hyperaccumulating plants.Lead and cadmium taken up this way are often accumulated in the plants'

Correct AnswerverifiedShow Answer

Which of the following is a natural process of plants that can be used by humans to remove toxins from soils? Check all that apply.

Correct AnswerverifiedShow Answer

In magnesium-deficient plants the older leaves show more severe symptoms of chlorosis which is a yellowing of the leaves than younger leaves.What is the best explanation?

Correct AnswerverifiedD

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A plant with 80 available ATP could produce 10 molecules of NH₃.

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C

If increased CO₂ concentrations result in plant tissue that is less nutritious,which of these is not a potential consequence for insect herbivores?

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In several studies of plant responses to elevated CO₂ concentrations in the atmosphere,scientists often found that the stimulation of growth gradually diminished because

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False

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Blocking the proton pumps in a root would result in a more negative membrane potential and an increase in K⁺ uptake.

Correct Answer
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Inside nitrogen-fixing nodules,one N₂ molecule is converted into two

Correct Answer
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A plant cell with 64 available ATP molecules could split how many N₂ molecules with the assistance of nitrogenase?

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D