Question 1

Which sequence represents the correct order of these three mineral particles of the soil, from smallest to largest?

Accepted Answer

A)  Clay F1F1F1S1F1F1F10 silt F1F1F1S1F1F1F10 sand 
B)  Sand F1F1F1S1F1F1F10 clay F1F1F1S1F1F1F10 humus 
C)  Sand F1F1F1S1F1F1F10 silt F1F1F1S1F1F1F10 clay 
D)  Humus F1F1F1S1F1F1F10 silt F1F1F1S1F1F1F10 sand 
E)  Silt F1F1F1S1F1F1F10 sand F1F1F1S1F1F1F10 loam 
A)  Clay F1F1F1S1F1F1F10 silt F1F1F1S1F1F1F10 sand 
B)  Sand F1F1F1S1F1F1F10 clay F1F1F1S1F1F1F10 humus 
C)  Sand F1F1F1S1F1F1F10 silt F1F1F1S1F1F1F10 clay 
D)  Humus F1F1F1S1F1F1F10 silt F1F1F1S1F1F1F10 sand 
E)  Silt F1F1F1S1F1F1F10 sand F1F1F1S1F1F1F10 loam

Question 2

If a plant's root produces a nodule meristem, what kind of bacteria must be present in the soil near the plant's roots?

Accepted Answer

A)  Rhizobia 
B)  Agrobacteria 
C)  Actinomycetes 
D)  Spirochetes 
E)  Firmicutes 
A)  Rhizobia 
B)  Agrobacteria 
C)  Actinomycetes 
D)  Spirochetes 
E)  Firmicutes

Question 3

Which nutrient would you add to the soil around a plant to help it form abundant membranes and nucleic acids?

Accepted Answer

A)  Magnesium 
B)  Nitrogen 
C)  Phosphorus 
D)  Potassium 
E)  Iron 
A)  Magnesium 
B)  Nitrogen 
C)  Phosphorus 
D)  Potassium 
E)  Iron

Question 4

Mycorrhizae can be found associated with the roots of more than _______ percent of terrestrial plants.

Accepted Answer

A)  10 
B)  20 
C)  50 
D)  75 
E)  90 
A)  10 
B)  20 
C)  50 
D)  75 
E)  90

Question 5

If a new essential nutrient were discovered, it would be a

Accepted Answer

A)  macronutrient. 
B)  micronutrient. 
C)  rare metal. 
D)  small organism. 
E)  cytochrome. 
A)  macronutrient. 
B)  micronutrient. 
C)  rare metal. 
D)  small organism. 
E)  cytochrome.

Question 6

Which list represents the correct order of soil horizons that you would encounter if you started digging in your garden?

Accepted Answer

A)  Parent bedrock F1F1F1S1F1F1F10 subsoil F1F1F1S1F1F1F10 topsoil 
B)  Topsoil F1F1F1S1F1F1F10 subsoil F1F1F1S1F1F1F10 parent bedrock 
C)  Topsoil F1F1F1S1F1F1F10 parent bedrock F1F1F1S1F1F1F10 subsoil 
D)  Parent bedrock F1F1F1S1F1F1F10 topsoil F1F1F1S1F1F1F10 subsoil 
E)  Subsoil F1F1F1S1F1F1F10 parent bedrock F1F1F1S1F1F1F10 topsoil 
A)  Parent bedrock F1F1F1S1F1F1F10 subsoil F1F1F1S1F1F1F10 topsoil 
B)  Topsoil F1F1F1S1F1F1F10 subsoil F1F1F1S1F1F1F10 parent bedrock 
C)  Topsoil F1F1F1S1F1F1F10 parent bedrock F1F1F1S1F1F1F10 subsoil 
D)  Parent bedrock F1F1F1S1F1F1F10 topsoil F1F1F1S1F1F1F10 subsoil 
E)  Subsoil F1F1F1S1F1F1F10 parent bedrock F1F1F1S1F1F1F10 topsoil

Question 7

The enzyme that catalyzes the fixation of nitrogen

Accepted Answer

A)  requires a lot of oxygen. 
B)  requires a powerful oxidizing agent. 
C)  requires only a high concentration of ATP. 
D)  requires both ATP and a powerful reducing agent. 
E)  is active in free-living rhizobia. 
A)  requires a lot of oxygen. 
B)  requires a powerful oxidizing agent. 
C)  requires only a high concentration of ATP. 
D)  requires both ATP and a powerful reducing agent. 
E)  is active in free-living rhizobia.

Question 8

Why do many farmers plant crops such as alfalfa and soybeans without harvesting them?

Accepted Answer

By rotating crops (and especially by rot

Question 9

Bacteroids must be able to respire to reduce N2 gas.Yet, nitrogenase is inhibited by O2.How is this conflict resolved in a nodule?

Accepted Answer

A)  Nitrogenase in a nodule is not inhibited by oxygen. 
B)  The bacteroid secretes a protein that binds oxygen. 
C)  The plant expresses a protein that acts as an oxygen buffer in nodules. 
D)  The concentration of O2 needed for respiration by bacteroids is lower than that required to inactivate nitrogenase. 
E)  The plant expresses a protein that acts as an oxygen buffer in nodules and the concentration of O2 needed for respiration by bacteroids is lower than that required to inactivate nitrogenase. 
A)  Nitrogenase in a nodule is not inhibited by oxygen. 
B)  The bacteroid secretes a protein that binds oxygen. 
C)  The plant expresses a protein that acts as an oxygen buffer in nodules. 
D)  The concentration of O2 needed for respiration by bacteroids is lower than that required to inactivate nitrogenase. 
E)  The plant expresses a protein that acts as an oxygen buffer in nodules and the concentration of O2 needed for respiration by bacteroids is lower than that required to inactivate nitrogenase.

Question 10

Plants that photosynthesize and parasitize other plants are called

Accepted Answer

A)  hemiparasites. 
B)  holoparasites. 
C)  carnivores. 
D)  herbivores. 
E)  detritivores. 
A)  hemiparasites. 
B)  holoparasites. 
C)  carnivores. 
D)  herbivores. 
E)  detritivores.

Question 11

The process of nitrogen fixation is the

Accepted Answer

A)  uptake of atmospheric nitrogen by plants. 
B)  conversion of atmospheric nitrogen into ammonia. 
C)  production of nitrogen-bearing compounds in plants. 
D)  release of nitrogen into the atmosphere. 
E)  release of ammonia into the atmosphere. 
A)  uptake of atmospheric nitrogen by plants. 
B)  conversion of atmospheric nitrogen into ammonia. 
C)  production of nitrogen-bearing compounds in plants. 
D)  release of nitrogen into the atmosphere. 
E)  release of ammonia into the atmosphere.

Question 12

The proteins in the plasma membrane of a plant roots' epidermis that take up nutrients are collectively called

Accepted Answer

A)  cotransports. 
B)  pumps. 
C)  ion channels. 
D)  nutrient transporters. 
E)  receptors. 
A)  cotransports. 
B)  pumps. 
C)  ion channels. 
D)  nutrient transporters. 
E)  receptors.

Question 13

The layer of cells that receives nutrients that have been absorbed by the root epidermis or received from symbiotic bacteria is called

Accepted Answer

A)  vascular tissue. 
B)  pericycle. 
C)  xylem. 
D)  endodermis. 
E)  cortex. 
A)  vascular tissue. 
B)  pericycle. 
C)  xylem. 
D)  endodermis. 
E)  cortex.

Question 14

Refer to the table showing the growth of cassava plants on different soil plots.Each experimental group consisted of the same number of plants on the same acreage in each plot.   It is likely that some of the plots had higher natural levels of _______.

Accepted Answer

The answer of Refer to the table showing the growth...

Question 15

Refer to the figure showing a soil profile.   Organic matter for gardeners would come from which horizon(s) shown in the figure?

Accepted Answer

The answer of Refer to the figure showing a soil...

Question 16

The uptake of which chemical element increases most with the addition of mycorrhizae to roots?

Accepted Answer

A)  Mg (magnesium) 
B)  Ca (calcium) 
C)  K (potassium) 
D)  Na (sodium) 
E)  P (phosphorus) 
A)  Mg (magnesium) 
B)  Ca (calcium) 
C)  K (potassium) 
D)  Na (sodium) 
E)  P (phosphorus)

Question 17

Organic fertilizers include

Accepted Answer

A)  only compost. 
B)  only manure. 
C)  rock phosphate. 
D)  root nodules. 
E)  both compost and manure. 
A)  only compost. 
B)  only manure. 
C)  rock phosphate. 
D)  root nodules. 
E)  both compost and manure.

Question 18

Which piece of evidence would lead you to believe that symbiotic relationships between plants and soil organisms are based on very ancient processes?

Accepted Answer

A)  The number of different symbioses in each individual plant 
B)  The extent of the hyphae associated with a plant 
C)  Fossilized remains of mycorrhizae with plant roots from very old rock strata 
D)  The age of a plant with symbiotic relationships 
E)  The evolutionary age of a plant species that has symbiotic relationships 
A)  The number of different symbioses in each individual plant 
B)  The extent of the hyphae associated with a plant 
C)  Fossilized remains of mycorrhizae with plant roots from very old rock strata 
D)  The age of a plant with symbiotic relationships 
E)  The evolutionary age of a plant species that has symbiotic relationships

Question 19

Which item is not a part of healthy soil?

Accepted Answer

A)  Air 
B)  Water 
C)  Particles 
D)  Organisms 
E)  Pathogenic fungus 
A)  Air 
B)  Water 
C)  Particles 
D)  Organisms 
E)  Pathogenic fungus

Question 20

Other than rhizobia in root nodules, what kind of bacteria makes symbiotic, nitrogen-fixing associations with land plants?

Accepted Answer

A)  Spirochetes 
B)  Cyanobacteria 
C)  Proteobacteria 
D)  Gram-negative, endospore-forming bacteria 
E)  Firmicutes 
A)  Spirochetes 
B)  Cyanobacteria 
C)  Proteobacteria 
D)  Gram-negative, endospore-forming bacteria 
E)  Firmicutes

Exam 35: Plant Nutrition

Which sequence represents the correct order of these three mineral particles of the soil, from smallest to largest?

If a plant's root produces a nodule meristem, what kind of bacteria must be present in the soil near the plant's roots?

Which nutrient would you add to the soil around a plant to help it form abundant membranes and nucleic acids?

Mycorrhizae can be found associated with the roots of more than _______ percent of terrestrial plants.

If a new essential nutrient were discovered, it would be a

Which list represents the correct order of soil horizons that you would encounter if you started digging in your garden?

The enzyme that catalyzes the fixation of nitrogen

Why do many farmers plant crops such as alfalfa and soybeans without harvesting them?

Bacteroids must be able to respire to reduce N2 gas.Yet, nitrogenase is inhibited by O2.How is this conflict resolved in a nodule?

Plants that photosynthesize and parasitize other plants are called

The process of nitrogen fixation is the

The proteins in the plasma membrane of a plant roots' epidermis that take up nutrients are collectively called

The layer of cells that receives nutrients that have been absorbed by the root epidermis or received from symbiotic bacteria is called

Refer to the table showing the growth of cassava plants on different soil plots.Each experimental group consisted of the same number of plants on the same acreage in each plot. It is likely that some of the plots had higher natural levels of _______.

Refer to the figure showing a soil profile. Organic matter for gardeners would come from which horizon(s) shown in the figure?

The uptake of which chemical element increases most with the addition of mycorrhizae to roots?

Organic fertilizers include

Which piece of evidence would lead you to believe that symbiotic relationships between plants and soil organisms are based on very ancient processes?

Which item is not a part of healthy soil?

Other than rhizobia in root nodules, what kind of bacteria makes symbiotic, nitrogen-fixing associations with land plants?

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Bacteroids must be able to respire to reduce N₂ gas.Yet, nitrogenase is inhibited by O₂.How is this conflict resolved in a nodule?