Question 1

The three elements most commonly added to agricultural soils are _______, _______, and _______.

Accepted Answer

nitrogen;

Question 2

An advantage to using inorganic fertilizers (as opposed to organic fertilizers) is that

Accepted Answer

A)  they improve the physical properties of the soil. 
B)  they can be taken up almost instantaneously. 
C)  their quality is better than that of organic fertilizers. 
D)  they contain minerals in their proper ionic form. 
E)  None of the above 
A)  they improve the physical properties of the soil. 
B)  they can be taken up almost instantaneously. 
C)  their quality is better than that of organic fertilizers. 
D)  they contain minerals in their proper ionic form. 
E)  None of the above

Question 3

The industrial production of nitrogen-containing fertilizer is currently limited by

Accepted Answer

A)  its high energy expense. 
B)  the inability to insert nitrogenase genes into plants. 
C)  the lack of nitrogenase for the industrial process. 
D)  the limited supply of N2 gas. 
E)  the need to exclude free oxygen in the process. 
A)  its high energy expense. 
B)  the inability to insert nitrogenase genes into plants. 
C)  the lack of nitrogenase for the industrial process. 
D)  the limited supply of N2 gas. 
E)  the need to exclude free oxygen in the process.

Question 4

Use the following to answer questions :
Refer to the diagram below, showing the nitrogen cycle.  
-Identify the bacterial groups labeled A, B, C, and D.

Accepted Answer

(A) nitrogen-fixing bacteria;

Question 5

Which of the following is not essential to the process of nitrogen fixation?

Accepted Answer

A)  N2 gas 
B)  O2 gas 
C)  A strong reducing agent 
D)  A great deal of energy 
E)  The enzyme nitrogenase 
A)  N2 gas 
B)  O2 gas 
C)  A strong reducing agent 
D)  A great deal of energy 
E)  The enzyme nitrogenase

Question 6

Which mineral is deficient in a plant whose growth is stunted and whose oldest leaves turn yellow and die prematurely?

Accepted Answer

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

Question 7

Nitrate and sulfate tend to leach from the soil because

Accepted Answer

A)  they bind with ions such as K+ and Mg2+. 
B)  the H+ ions released by the roots push them out. 
C)  they are unable to bind with the negatively charged clay particles. 
D)  they bind with the positively charged clay particles. 
E)  All of the above 
A)  they bind with ions such as K+ and Mg2+. 
B)  the H+ ions released by the roots push them out. 
C)  they are unable to bind with the negatively charged clay particles. 
D)  they bind with the positively charged clay particles. 
E)  All of the above

Question 8

Some plants living in boggy areas of low pH have adaptations for carnivory in order to increase their intake of _______. These carnivorous plants are considered to be _______ because they acquire energy from photosynthesis.

Accepted Answer

nitrogen;

Question 9

Plants use the essential element _______ as a messenger.

Accepted Answer

The answer of Plants use the essential element _______ as...

Question 10

Which of the following nitrogen compounds is used directly by plants to build proteins?

Accepted Answer

A)  Ammonium 
B)  N2 
C)  Nitrate 
D)  Nitrite 
E)  Nitrous oxide 
A)  Ammonium 
B)  N2 
C)  Nitrate 
D)  Nitrite 
E)  Nitrous oxide

Question 11

Because of leaching and crop production, soils may become depleted of nutrients and require the addition of _______.

Accepted Answer

The answer of Because of leaching and crop production, soils...

Question 12

One of the defining characteristics of an essential element is that

Accepted Answer

A)  it is necessary only for early growth of the seedling. 
B)  it can be replaced by another element. 
C)  the plant cannot survive without it. 
D)  may function by relieving the toxicity of another element. 
E)  is found in relatively high concentrations in the environment. 
A)  it is necessary only for early growth of the seedling. 
B)  it can be replaced by another element. 
C)  the plant cannot survive without it. 
D)  may function by relieving the toxicity of another element. 
E)  is found in relatively high concentrations in the environment.

Question 13

Hydrogen in hydrocarbons enters living systems from

Accepted Answer

A)  the atmosphere. 
B)  oil and coal. 
C)  water. 
D)  H2S. 
E)  All of the above 
A)  the atmosphere. 
B)  oil and coal. 
C)  water. 
D)  H2S. 
E)  All of the above

Question 14

Nitrification is

Accepted Answer

A)  performed only by plants. 
B)  the reduction of ammonium ions to nitrate ions. 
C)  the reduction of nitrate ions to nitrogen gas. 
D)  catalyzed by the enzyme nitrogenase. 
E)  performed by certain bacteria in the soil. 
A)  performed only by plants. 
B)  the reduction of ammonium ions to nitrate ions. 
C)  the reduction of nitrate ions to nitrogen gas. 
D)  catalyzed by the enzyme nitrogenase. 
E)  performed by certain bacteria in the soil.

Question 15

The label "10-20-10" on a package of commercial fertilizer refers to the _______ the fertilizer.

Accepted Answer

A)  percentages of nitrogen, phosphate, and potassium in 
B)  percentages of nitrogen, carbon, and oxygen in 
C)  percentages of phosphate, iron, and potassium in 
D)  rate at which nitrogen is released from 
E)  ratio of organic to inorganic matter in 
A)  percentages of nitrogen, phosphate, and potassium in 
B)  percentages of nitrogen, carbon, and oxygen in 
C)  percentages of phosphate, iron, and potassium in 
D)  rate at which nitrogen is released from 
E)  ratio of organic to inorganic matter in

Question 16

Which of the following nutrients is not considered essential for plant growth?

Accepted Answer

A)  Cadmium 
B)  Nitrogen 
C)  Manganese 
D)  Potassium 
E)  All are essential. 
A)  Cadmium 
B)  Nitrogen 
C)  Manganese 
D)  Potassium 
E)  All are essential.

Question 17

Plants in nature

Accepted Answer

A)  usually have unlimited nitrogen supplies. 
B)  usually have limited nitrogen supplies. 
C)  usually can fix nitrogen from the air. 
D)  do not display symptoms when nitrogen is deficient. 
E)  have yellow older leaves when nitrogen is overabundant. 
A)  usually have unlimited nitrogen supplies. 
B)  usually have limited nitrogen supplies. 
C)  usually can fix nitrogen from the air. 
D)  do not display symptoms when nitrogen is deficient. 
E)  have yellow older leaves when nitrogen is overabundant.

Question 18

Most of the nitrogen on Earth exists in the form of

Accepted Answer

A)  ammonia. 
B)  nitrate ions. 
C)  N2 gas. 
D)  amino acids. 
E)  proteins. 
A)  ammonia. 
B)  nitrate ions. 
C)  N2 gas. 
D)  amino acids. 
E)  proteins.

Question 19

Which of the following is not a consequence of adding lime to acidic soil?

Accepted Answer

A)  Raised soil pH 
B)  Increased nutrient availability to plants 
C)  Addition of calcium (Ca2+) to the soil 
D)  Release of hydrogen ions (H+) by clay particles 
E)  Increase in the soil's ability to retain water 
A)  Raised soil pH 
B)  Increased nutrient availability to plants 
C)  Addition of calcium (Ca2+) to the soil 
D)  Release of hydrogen ions (H+) by clay particles 
E)  Increase in the soil's ability to retain water

Question 20

The best topsoils are composed of

Accepted Answer

A)  clay. 
B)  sand. 
C)  organic matter. 
D)  Both a and b 
E)  All of the above 
A)  clay. 
B)  sand. 
C)  organic matter. 
D)  Both a and b 
E)  All of the above

Exam 36: Plant Nutrition

The three elements most commonly added to agricultural soils are _______, _______, and _______.

An advantage to using inorganic fertilizers (as opposed to organic fertilizers) is that

The industrial production of nitrogen-containing fertilizer is currently limited by

Use the following to answer questions : Refer to the diagram below, showing the nitrogen cycle. -Identify the bacterial groups labeled A, B, C, and D.

Which of the following is not essential to the process of nitrogen fixation?

Which mineral is deficient in a plant whose growth is stunted and whose oldest leaves turn yellow and die prematurely?

Nitrate and sulfate tend to leach from the soil because

Some plants living in boggy areas of low pH have adaptations for carnivory in order to increase their intake of _______. These carnivorous plants are considered to be _______ because they acquire energy from photosynthesis.

Plants use the essential element _______ as a messenger.

Which of the following nitrogen compounds is used directly by plants to build proteins?

Because of leaching and crop production, soils may become depleted of nutrients and require the addition of _______.

One of the defining characteristics of an essential element is that

Hydrogen in hydrocarbons enters living systems from

Nitrification is

The label "10-20-10" on a package of commercial fertilizer refers to the _______ the fertilizer.

Which of the following nutrients is not considered essential for plant growth?

Plants in nature

Most of the nitrogen on Earth exists in the form of

Which of the following is not a consequence of adding lime to acidic soil?

The best topsoils are composed of

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Filters

The three elements most commonly added to agricultural soils are ___, _, and _____.

Some plants living in boggy areas of low pH have adaptations for carnivory in order to increase their intake of _. These carnivorous plants are considered to be _ because they acquire energy from photosynthesis.