Iha Education February Webinar - Plant Growth Regulators

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Iha Education February Webinar - Plant Growth Regulators - Quiz


This quiz was created by the IHA as a review for a webinar presented in February 2009 regarding Plant Growth Regulators.


Questions and Answers
  • 1. 

    Applying PGR’s early in the production of a crop generally provides more growthregulation than one applied closer to mature size.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Applying plant growth regulators (PGRs) early in the production of a crop is more effective in regulating growth compared to applying them when the crop is closer to its mature size. This is because PGRs work by influencing plant hormones and physiological processes to control growth and development. Applying PGRs early allows for better manipulation of these processes, resulting in more significant growth regulation. As the crop approaches maturity, its growth processes become more fixed and less responsive to PGRs, making them less effective in controlling growth. Therefore, the statement is true.

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  • 2. 

    When comparing soil drenches of Bonzi/Paczol to foliar sprays, drenches typically:

    • A.

      Spread less disease

    • B.

      Improve flower color

    • C.

      Provide longer height control

    • D.

      Cause less bloom delay

    • E.

      C and D

    Correct Answer
    E. C and D
    Explanation
    When comparing soil drenches of Bonzi/Paczol to foliar sprays, drenches typically provide longer height control and cause less bloom delay. This means that using soil drenches of Bonzi/Paczol instead of foliar sprays can help in controlling the height of plants for a longer period of time and also reduce the delay in blooming.

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  • 3. 

    Fascination reduces stem elongation and lower leaf yellowing of Easter lilies when used as directed.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Fascination does not reduce stem elongation and lower leaf yellowing of Easter lilies when used as directed.

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  • 4. 

    Which two PGR’s are recommended to reduce the height of Easter lilies?

    • A.

      A-Rest, Fascination

    • B.

      B-Nine, Cycocel

    • C.

      A-rest, Sumagic

    • D.

      Florel, Fascination

    Correct Answer
    C. A-rest, Sumagic
    Explanation
    A-rest and Sumagic are recommended as plant growth regulators (PGRs) to reduce the height of Easter lilies. PGRs are used to control the growth and development of plants, and in this case, they are specifically used to reduce the height of the Easter lilies. A-rest and Sumagic are two specific PGRs that have been found to be effective in achieving this purpose.

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  • 5. 

    Which one of these has no influence on internode elongation (stretching):

    • A.

      Watering practices

    • B.

      Available light

    • C.

      Temperature

    • D.

      Source of nitrogen

    • E.

      Phosphorus

    Correct Answer
    D. Source of nitrogen
    Explanation
    The source of nitrogen does not have any influence on internode elongation (stretching). Nitrogen is an essential nutrient for plant growth and development, but its availability does not directly affect the elongation of internodes. Other factors such as watering practices, available light, and temperature can have an impact on internode elongation by affecting the overall growth and metabolism of the plant. Phosphorus, another essential nutrient, may also influence internode elongation, but the source of nitrogen specifically does not play a role in this process.

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  • 6. 

    Florel produces which of the following responses in most plants?

    • A.

      Promotes lateral branching

    • B.

      Reduces internode elongation

    • C.

      Delays blooming

    • D.

      Exaggerates plant stress

    • E.

      All of the above

    Correct Answer
    E. All of the above
    Explanation
    Florel is a plant growth regulator that is commonly used to control the growth and development of plants. It has multiple effects on plants, including promoting lateral branching, reducing internode elongation, delaying blooming, and exaggerating plant stress. Therefore, the correct answer is "All of the above." Florel can be used to manipulate the growth and flowering of plants in various ways, depending on the desired outcome.

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  • 7. 

    Most PGR’s are applied at a rate of 1 gallon per 200 square feet. Which one is applied just to the point of glisten?

    • A.

      A-Rest

    • B.

      B-Nine, Compress

    • C.

      Bonzi, Paczol

    • D.

      Cycocel

    • E.

      Florel

    Correct Answer
    D. Cycocel
    Explanation
    Cycocel is the correct answer because it is applied just to the point of glisten. The question mentions that most PGR's are applied at a rate of 1 gallon per 200 square feet, but Cycocel is the exception as it is only applied until the plant leaves glisten. This implies that Cycocel is applied in a smaller quantity compared to other PGR's, making it the correct answer.

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  • 8. 

    The Wave petunia program suggested in the webinar consists of a foliar spray of Florel followed by a Bonzi/Paczol drench. Which of the following is not a result of this program?

    • A.

      More compact growth

    • B.

      Earlier flowering

    • C.

      Reduced disease spread

    • D.

      Less labor

    Correct Answer
    B. Earlier flowering
    Explanation
    The Wave petunia program suggested in the webinar, which includes a foliar spray of Florel followed by a Bonzi/Paczol drench, results in more compact growth, reduced disease spread, and less labor. However, earlier flowering is not a direct result of this program.

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  • 9. 

    Pine bark in soil mixes can reduce the effectiveness of PGR drenches.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The presence of pine bark in soil mixes can hinder the effectiveness of PGR (Plant Growth Regulator) drenches. This means that when PGRs are applied to plants grown in soil mixes containing pine bark, their ability to regulate plant growth may be reduced. This could be due to various factors such as the pine bark absorbing or binding the PGRs, preventing them from reaching the plant roots or being absorbed by the plants. Therefore, it is true that pine bark in soil mixes can diminish the effectiveness of PGR drenches.

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  • 10. 

    To reduce the potential for plants to stretch:

    • A.

      Increase the average daily temperature.

    • B.

      Decrease the average daily temperature.

    • C.

      Reduce the day temperature while leaving the night temperature the same.

    • D.

      Play loud Disco music in the greenhouse night and day.

    Correct Answer
    C. Reduce the day temperature while leaving the night temperature the same.
    Explanation
    Reducing the day temperature while keeping the night temperature the same can help reduce the potential for plants to stretch. This is because plants tend to stretch or elongate when they receive insufficient light during the day. By lowering the day temperature, the plant's growth rate is slowed down, allowing it to develop more compact and sturdy growth. However, maintaining the same night temperature ensures that the plants still receive the necessary warmth and energy during their resting period.

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Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • May 31, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 16, 2009
    Quiz Created by
    Jofa7999
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