Question 1

When legumes with nitrogen-fixation nodules are given chemical fertilizers with high nitrogen concentrations,they abandon support of the nodules and end the symbiosis.Why?

Accepted Answer

A)  The mineral nutrients inhibit nitrogenase activity.
B)  Nitrogen gas is no longer available in the soil.
C)  The nitrogen-fixation process is very expensive for the plant.
D)  The dissolved chemical nutrients are toxic to Rhizobium bacteria.
E)  Dissolved nitrogen uncurls the root hairs,releasing the nodulE.F) A) and B)
G) A) and C)

Question 2

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 oxygen from inhibiting the nitrogenase enzymE.F) C) and E)
G) All of the above

Question 3

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) B) and C)
G) A) and E)

Question 4

Which of the following is not a plant macronutrient?

Accepted Answer

A)  boron
B)  potassium
C)  phosphorus
D)  nitrogen
E)  sulfurF) None of the above
G) B) and D)

Question 5

Plants need ammonia (NH3) to

Accepted Answer

A)  build amino acids.
B)  build fatty acids.
C)  build micronutrients.
D)  fix nitrogen.
E)  deter herbivores.F) None of the above
G) D) and E)

Question 6

Which of the following statements about plant macronutrients is not true?

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 uptake minerals is affected by soil pH.F) All of the above
G) A) and B)

Question 7

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) All of the above
G) B) and C)

Question 8

In topsoil,which of these components usually represents the greatest volume?

Accepted Answer

A)  mineral particles of varying size
B)  living organisms
C)  humus
D)  roots
E)  air and waterF) B) and D)
G) C) and D)

Question 9

Splitting the triple bonds of a N2 molecule with the nitrogenase enzyme requires ______ ATPs.

Accepted Answer

A)  2
B)  4
C)  8
D)  16
E)  32F) B) and D)
G) B) and E)

Question 10

Trichlorotheylene (TCE) is toxic to humans because it

Accepted Answer

A)  depletes nitrogen from soils.
B)  is carcinogenic.
C)  contains heavy metals.
D)  prevents CO2 production by plants.
E)  causes a decrease in the yield of crop plants.F) C) and D)
G) A) and E)

Question 11

Choose the letter of the best match from the following:
-Component of chlorophyll,activates many enzymes,divalent cation.

Accepted Answer

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

Question 12

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

Accepted Answer

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

Question 13

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

Accepted Answer

A)  sugars
B)  proteins
C)  transcription factors
D)  flavonoids
E)  Nod factorsF) All of the above
G) None of the above

Question 14

Choose the letter of the best match from the following:
-Component of ADP,ATP,nucleic acids,and several coenzymes.

Accepted Answer

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

Question 15

Heavy metals in contaminated soils can be taken up by hyper-accumulating 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) A) and B)
G) A) and C)

Question 16

The effects of elevated atmospheric CO2 concentrations

Accepted Answer

A)  have the potential to alter the nutritional status of plants.
B)  have the potential to allow herbivores to eat less plant matter.
C)  have no effect on nutrient levels found in plant leaves.
D)  allow the plant to use O2 more efficiently in photosynthesis.
E)  cause an increase in Rubisco production.F) B) and E)
G) B) and C)

Question 17

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) D) and E)
G) None of the above

Question 18

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)  inorganic fertilizers.
D)  the Calvin Cycle.
E)  photorespiration.F) B) and E)
G) B) and C)

Question 19

Which of the following is not a natural process of plants that can be used by humans to remove toxins from soils?

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 pushes 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) B) and E)
G) A) and C)

Question 20

Choose the letter of the best match from the following:
-Required for protein synthesis and operation of stomata.

Accepted Answer

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

Exam 39: Plant Nutrition and Soils

Choose the letter of the best match from the following: -Component of chlorophyll,activates many enzymes,divalent cation.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In topsoil,which of these components usually represents the greatest volume?

Correct AnswerverifiedShow Answer

Which of the following is not a plant macronutrient?

Correct AnswerverifiedShow Answer

Choose the letter of the best match from the following: -Component of ADP,ATP,nucleic acids,and several coenzymes.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following statements about plant macronutrients is not true?

Correct AnswerverifiedShow Answer

Splitting the triple bonds of a N2 molecule with the nitrogenase enzyme requires ______ ATPs.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Trichlorotheylene (TCE) is toxic to humans because it

Correct AnswerverifiedShow Answer

The effects of elevated atmospheric CO2 concentrations

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Choose the letter of the best match from the following: -Required for protein synthesis and operation of stomata.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Plants need ammonia (NH3) to

Correct AnswerverifiedShow Answer

Which of the following is not a natural process of plants that can be used by humans to remove toxins from soils?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The Nod factor is an important component of

Correct AnswerverifiedShow Answer

When legumes with nitrogen-fixation nodules are given chemical fertilizers with high nitrogen concentrations,they abandon support of the nodules and end the symbiosis.Why?

Correct AnswerverifiedShow Answer

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Splitting the triple bonds of a N₂ molecule with the nitrogenase enzyme requires ______ ATPs.

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The effects of elevated atmospheric CO₂ concentrations

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Plants need ammonia (NH₃) to

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