Question 1

The habitats most favorable for the growth of legumes in symbiosis with nitrogen-fixing bacteria are

Accepted Answer

A)  potassium-poor soils.
B)  phosphorus-poor soils.
C)  manganese-poor soils.
D)  calcium-poor soils.
E)  nitrogen-poor soils.F) B) and E)
G) B) and C)

Question 2

A soil sample with a OH- concentration of 10-9 M may also have high levels of aluminum.

Accepted Answer

A) True 
 B)False

Question 3

Plants can remove harmful chemicals from the soil by the process of

Accepted Answer

A)  glandular secretion by leaves.
B)  CO2 activation.
C)  phytoremediation.
D)  fertilization.
E)  root nodule formation.F) A) and B)
G) B) and C)

Question 4

Natural communities recycle nutrients,but cultivated communities often require an input of mineral nutrients due to losses through

Accepted Answer

A)  erosion.
B)  humus.
C)  nitrogen fixation.
D)  crop rotation.
E)  iron accumulation.F) C) and D)
G) D) and E)

Question 5

Humus often enhances the water and nutrient-retaining properties of topsoil.Which of the following might increase the humus content of a soil? Check all that apply.

Accepted Answer

A)  mushroom compost
B)  leaf litter
C)  ground limestone
D)  phosphate fertilizer
E)  fish mealF) All of the above
G) A) and B)

Question 6

In acidic soils or in habitats subjected to prolonged acid rain,what element is often released from rocks that is toxic to many plants?

Accepted Answer

A)  iron
B)  chlorine
C)  molybdenum
D)  selenium
E)  aluminumF) A) and B)
G) D) and E)

Question 7

A deficiency in a plant micronutrient

Accepted Answer

A)  is less serious than a deficiency in a macronutrient.
B)  makes that plant susceptible to herbivores.
C)  can have a severe effect on plant growth.
D)  results in no visible symptoms.
E)  has no impact on the agriculture of a region.F) B) and D)
G) C) and E)

Question 8

During the initiation of nitrogen-fixation nodules,the Rhizobium bacteria release what type of molecules to signal the host plant?

Accepted Answer

A)  sugars
B)  proteins
C)  transcription factors
D)  flavonoids
E)  Nod factorsF) A) and D)
G) D) and E)

Question 9

Certain plants have been genetically modified to secrete citrate,which helps

Accepted Answer

A)  make the phosphate in soils more soluble.
B)  plants make necessary micronutrients.
C)  reveal mineral deficiencies in a plant.
D)  make hydroponic growth possible.
E)  plants add metals to the soil in which they are growing.F) All of the above
G) A) and C)

Question 10

When plants are grown in hydroponic culture,their roots are suspended in an aerated solution.Why is the solution aerated? Check all that apply.

Accepted Answer

A)  Both the light-dependent and the light-independent reactions of photosynthesis require oxygen.
B)  Oxygen is necessary for the root cells to produce ATP.
C)  Without oxygen,membrane transport in the roots would be impaired.
D)  A lack of oxygen would cause the water potential within the roots to decrease.
E)  Without oxygen,the xylem would stop flowing.F) C) and D)
G) A) and E)

Question 11

A primary advantage of using integrated nutrient management compared to inorganic chemical fertilizers is that

Accepted Answer

A)  less organic fertilizer is needed than chemical fertilizers.
B)  only organic fertilizers contain micronutrients.
C)  organic fertilizers release nutrients more slowly.
D)  chemical fertilizers are not soluble in water.
E)  chemical fertilizers break down very slowly.F) None of the above
G) C) and D)

Question 12

Why is it beneficial to plants that soil particles have negatively-charged surfaces?

Accepted Answer

A)  It helps maintain the water potential of the soil.
B)  They attract positively-charged ions and prevent them from being washed deep into the soil.
C)  Negatively-charged ions are pushed towards the roots.
D)  Toxic metals are trapped and kept away from the plants.
E)  They capture negatively-charged ions.F) C) and D)
G) A) and E)

Question 13

Most parasitic plants like other land plants have mycorrhizal symbionts.

Accepted Answer

A) True 
 B)False

Question 14

Why do nitrogen-fixation nodules contain large amounts of leghemoglobin?

Accepted Answer

A)  It helps transport oxygen to the bacteria.
B)  The nitrogenase enzyme interacts with the iron in the leghemoglobin.
C)  The leghemoglobin helps break the triple bond of N2.
D)  It stimulates the Nod factors.
E)  It prevents carbon dioxide from inhibiting the nitrogenase enzyme.F) None of the above
G) C) and D)

Question 15

Insectivorous plants such as the Venus flytrap,pitcher plant,and bladderworts often grow in

Accepted Answer

A)  alkaline soil.
B)  sandy soil.
C)  clay soil.
D)  marshes.
E)  acidic soils.F) B) and C)
G) A) and E)

Question 16

Carnivorous plants evolved because which of the following nutrients is often extremely limited in their habitats?

Accepted Answer

A)  carbon
B)  CO2
C)  O2
D)  nitrogen
E)  ironF) B) and C)
G) All of the above

Question 17

Mycorrhizae are especially effective in helping plant roots uptake

Accepted Answer

A)  nitrogen.
B)  phosphorus.
C)  potassium.
D)  iron.
E)  magnesium.F) B) and D)
G) A) and E)

Question 18

During the initiation of nitrogen-fixation nodules,how do the Rhizobium bacteria enter into the cortex of the root?

Accepted Answer

A)  through the plasmadesmata of the root hairs
B)  via the apoplastic pathway
C)  using proton pumps
D)  through a membrane tube called an infection thread
E)  by repeated cell divisionsF) A) and D)
G) C) and E)

Question 19

A parasitic plant without chlorophyll is likely to lack leaves.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following statements about plant macronutrients is/are true? Check all that apply.

Accepted Answer

A)  They approach or exceed 1% of a healthy plant's dry weight.
B)  They reduce the need for CO2 during photosynthesis.
C)  A deficiency in any one can have severe effects on a plant's growth.
D)  They can have important implications for human nutrition.
E)  The ability of the plants to take up minerals is affected by soil pH.F) A) and B)
G) D) and E)

Exam 37: Plant Nutrition and Soils

Plants can remove harmful chemicals from the soil by the process of

Correct AnswerverifiedShow Answer

A primary advantage of using integrated nutrient management compared to inorganic chemical fertilizers is that

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Mycorrhizae are especially effective in helping plant roots uptake

Correct AnswerverifiedShow Answer

Carnivorous plants evolved because which of the following nutrients is often extremely limited in their habitats?

Correct AnswerverifiedShow Answer

Humus often enhances the water and nutrient-retaining properties of topsoil.Which of the following might increase the humus content of a soil? Check all that apply.

Correct AnswerverifiedShow Answer

Why do nitrogen-fixation nodules contain large amounts of leghemoglobin?

Correct AnswerverifiedShow Answer

Natural communities recycle nutrients,but cultivated communities often require an input of mineral nutrients due to losses through

Correct AnswerverifiedShow Answer

Most parasitic plants like other land plants have mycorrhizal symbionts.

Correct AnswerverifiedShow Answer

In acidic soils or in habitats subjected to prolonged acid rain,what element is often released from rocks that is toxic to many plants?

Correct AnswerverifiedShow Answer

Certain plants have been genetically modified to secrete citrate,which helps

Correct AnswerverifiedShow Answer

When plants are grown in hydroponic culture,their roots are suspended in an aerated solution.Why is the solution aerated? Check all that apply.

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A deficiency in a plant micronutrient

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Which of the following statements about plant macronutrients is/are true? Check all that apply.

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Why is it beneficial to plants that soil particles have negatively-charged surfaces?

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A parasitic plant without chlorophyll is likely to lack leaves.

Correct AnswerverifiedShow Answer

Insectivorous plants such as the Venus flytrap,pitcher plant,and bladderworts often grow in

Correct AnswerverifiedShow Answer

A soil sample with a OH- concentration of 10-9 M may also have high levels of aluminum.

Correct AnswerverifiedShow Answer

During the initiation of nitrogen-fixation nodules,the Rhizobium bacteria release what type of molecules to signal the host plant?

Correct AnswerverifiedShow Answer

The habitats most favorable for the growth of legumes in symbiosis with nitrogen-fixing bacteria are

Correct AnswerverifiedShow Answer

During the initiation of nitrogen-fixation nodules,how do the Rhizobium bacteria enter into the cortex of the root?

Correct AnswerverifiedShow Answer

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A soil sample with a OH^- concentration of 10^-9 M may also have high levels of aluminum.

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