Question 1

If the parasitic dodder plant (Cuscuta spp. ) lacks chlorophyll,what types of nutrients is it most likely extracting from its host?

Accepted Answer

A)  proteins
B)  mineral nutrients
C)  lipids
D)  carbohydrates
E)  nucleic acidsF) B) and E)
G) A) and D)

Question 2

Which of the following is not part of a nitrogen-fixing nodule?

Accepted Answer

A)  root hairs
B)  cortex cells
C)  bacteroids
D)  vascular tissue
E)  lateral meristemF) C) and D)
G) A) and B)

Question 3

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

Question 4

Which of these is not affected strongly by elevated growth temperatures in plants?

Accepted Answer

A)  photosynthesis
B)  respiration
C)  photorespiration
D)  transpiration
E)  carbon : nitrogen ratios in the plant tissuesF) C) and E)
G) A) and E)

Question 5

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

Accepted Answer

A)  bogs.
B)  prairies.
C)  hilly slopes.
D)  grasslands.
E)  nitrogen-poor soils.F) B) and D)
G) A) and C)

Question 6

Mycorrhizae are especially effective in helping plant roots uptake

Accepted Answer

A)  nitrogen.
B)  phosphorus.
C)  potassium.
D)  iron.
E)  magnesium.F) All of the above
G) None of the above

Question 7

Which of these is not considered a potentially dangerous heavy metal contaminant in soil?

Accepted Answer

A)  cadmium
B)  iron
C)  arsenic
D)  lead
E)  zincF) D) and E)
G) B) and C) B

Question 8

Choose the letter of the best match from the following:
-Component of cell walls,involved in maintenance of membrane structure.

Accepted Answer

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

Question 9

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

Question 10

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 B)
G) C) and E) C

Question 11

A primary advantage of using organic fertilizers 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) B) and D)
G) C) and D)

Question 12

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

Question 13

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

Question 14

Which of the following does not increase the level of nutrients available to crop plants?

Accepted Answer

A)  adding humus to the soil
B)  crop rotation
C)  plowing crop residues under
D)  applying herbicides
E)  applying chemical fertilizersF) A) and C)
G) B) and C)

Question 15

The most important mineral nutrients added to soils in fertilizers are

Accepted Answer

A)  nitrogen,phosphorous,and potassium.
B)  calcium and nitrogen.
C)  magnesium,phosphorus,and iron.
D)  sulfur.
E)  calcium carbonatE.F) A) and B)
G) C) and E)

Question 16

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

Accepted Answer

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

Question 17

Which of the following is not a plant micronutrient?

Accepted Answer

A)  iron
B)  phosphorus
C)  chlorine
D)  copper
E)  manganeseF) C) and E)
G) None of the above

Question 18

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

Accepted Answer

A)  nitrogen fertilizers
B)  organic fertilizers
C)  phosphorous fertilizers
D)  potassium fertilizers
E)  inorganic fertilizersF) B) and D)
G) None of the above

Question 19

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 D)
G) A) and C)

Question 20

A typical root pumps out H+ to maintain a strong membrane potential of about

Accepted Answer

A)  -12 V.
B)  120 V.
C)  60 Hz.
D)  -160 mV.
E)  pH 5.0.F) A) and E)
G) A) and D) D

Exam 39: Plant Nutrition and Soils

If the parasitic dodder plant (Cuscuta spp. ) lacks chlorophyll,what types of nutrients is it most likely extracting from its host?

Correct AnswerverifiedShow Answer

Which of the following is not part of a nitrogen-fixing nodule?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of these is not affected strongly by elevated growth temperatures in plants?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Mycorrhizae are especially effective in helping plant roots uptake

Correct AnswerverifiedShow Answer

Which of these is not considered a potentially dangerous heavy metal contaminant in soil?

Correct AnswerverifiedB

Choose the letter of the best match from the following: -Component of cell walls,involved in maintenance of membrane structure.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

A primary advantage of using organic fertilizers compared to inorganic chemical fertilizers is that

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A deficiency in a plant micronutrient

Correct AnswerverifiedShow Answer

Which of the following does not increase the level of nutrients available to crop plants?

Correct AnswerverifiedShow Answer

The most important mineral nutrients added to soils in fertilizers are

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is not a plant micronutrient?

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 the most?

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

A typical root pumps out H+ to maintain a strong membrane potential of about

Correct AnswerverifiedD

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B

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C

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

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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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A typical root pumps out H⁺ to maintain a strong membrane potential of about

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D