IHA Education August Webinar - OHP | Attempts: 91

2.

Gibberellins affect plant cell elongation, increasing internode length

True
False

Correct Answer

A. True

Explanation

Gibberellins are a group of plant hormones that play a crucial role in regulating plant growth and development. One of their main functions is to promote cell elongation, which results in the increase of internode length. Therefore, it is true that gibberellins affect plant cell elongation and increase internode length.

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3.

PGR's make plants produce more chlorophyll thus making them more green

True
False

Correct Answer

A. False

Explanation

The statement is false because PGRs (Plant Growth Regulators) do not directly make plants produce more chlorophyll. PGRs are chemical substances that regulate plant growth and development, but they do not specifically target chlorophyll production. Chlorophyll synthesis is primarily influenced by environmental factors such as light, temperature, and nutrient availability. While PGRs can indirectly affect chlorophyll levels by influencing overall plant growth and metabolism, they do not directly stimulate chlorophyll production.

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4.

Which statement is most true?

High soil bark levels means lowering your PGR rates
Triazole type PGR's take a long time to be plant absorbed
B-Nine or Florel type PGR's are best applied in the morning or evening.
Southern states often use lower rates than northern states

Correct Answer

A. B-Nine or Florel type PGR's are best applied in the morning or evening.

Explanation

B-Nine or Florel type PGR's are best applied in the morning or evening because during these times, the temperature is cooler and the plants are less active. This allows for better absorption and distribution of the PGR's throughout the plant. Applying PGR's during the morning or evening also reduces the risk of phytotoxicity, as the plants are less stressed during these times.

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5.

Tank mixing of PGR's and other pesticides is a good idea

True
False

Correct Answer

A. False

Explanation

Mixing plant growth regulators (PGRs) with other pesticides is not a good idea. PGRs are chemicals that regulate the growth and development of plants, while pesticides are chemicals used to control pests. Mixing these two types of chemicals can lead to unpredictable and adverse effects on plants, such as stunted growth, reduced yield, or even plant death. It is recommended to apply PGRs and pesticides separately, following their specific instructions, to ensure their effectiveness and minimize any potential harm to the plants.

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6.

Paclobutrazole products are absorbed into which plant parts?

Leaves and stems
Leaves and roots
Roots only
Stems and roots
None of the above

Correct Answer

A. Stems and roots

Explanation

Paclobutrazole products are absorbed into the stems and roots of plants. This means that when these products are applied to plants, they are taken up by the stems and roots and distributed throughout the plant. This absorption allows the paclobutrazole to have systemic effects on the plant, regulating growth and development. The leaves are not mentioned in the answer, indicating that they are not the primary plant parts where paclobutrazole is absorbed.

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7.

Triazole type PGR's (Paczol, Bonzi, Sumagic etc.) (pick one)

Explanation

Triazole type PGRs, such as Paczol, Bonzi, Sumagic, are a class of plant growth regulators. These PGRs are commonly used in horticulture to control and regulate plant growth. They work by inhibiting the production of gibberellins, which are plant hormones responsible for promoting stem elongation and cell division. By inhibiting gibberellin production, triazole type PGRs can help to control excessive plant growth, promote compactness, and improve overall plant quality. These PGRs are often used in the production of ornamental plants, such as bedding plants and potted plants, to achieve desired growth habits and enhance marketability.

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8.

Daminozide is very water soluable and Paclobutrazole is very water in-soluable

True
False

Correct Answer

A. True

Explanation

Daminozide and Paclobutrazole are both plant growth regulators commonly used in horticulture. The statement correctly states that Daminozide is very water soluble, meaning it easily dissolves in water, while Paclobutrazole is very water insoluble, meaning it does not dissolve easily in water. Therefore, the statement is true.

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9.

PGR's should be spray applied using?

1 qt/100 ft2
2 qt/100 ft2
1gl/100 ft2
2gl/100 ft2

Correct Answer

A. 2 qt/100 ft2

Explanation

The correct answer is 2 qt/100 ft2. This means that PGR's (plant growth regulators) should be applied at a rate of 2 quarts per 100 square feet. This is the recommended amount for effective application and control of plant growth.

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10.

Late sprays on flowering plants near bud set can

Increase flower size & count
Delay blooming
Has no effect on blooming
Make poinsettia brachts small
B and d are correct

Correct Answer

A. B and d are correct

Explanation

Late sprays on flowering plants near bud set can delay blooming and make poinsettia bracts small. Spraying plants with certain chemicals or substances during the bud formation stage can disrupt the natural growth and development process, causing a delay in blooming. Additionally, these sprays can also affect the size and appearance of the flowers or bracts, making them smaller in the case of poinsettias. Therefore, options b and d are correct.

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Iha Education August Webinar - Ohp

Which of the following are classes of Plant Growth Regulators (PGR's)?

Gibberellins affect plant cell elongation, increasing internode length

PGR's make plants produce more chlorophyll thus making them more green

Which statement is most true?

Tank mixing of PGR's and other pesticides is a good idea

Paclobutrazole products are absorbed into which plant parts?

Triazole type PGR's (Paczol, Bonzi, Sumagic etc.) (pick one)

Daminozide is very water soluable and Paclobutrazole is very water in-soluable

PGR's should be spray applied using?

Late sprays on flowering plants near bud set can