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All of the given options, including auxins, cytokinins, jasmonic acid, and gibberellins, are classes of Plant Growth Regulators (PGR's). These substances play crucial roles in regulating plant growth and development, including cell elongation, cell division, flowering, and fruit ripening. Auxins promote cell elongation, cytokinins stimulate cell division, jasmonic acid is involved in stress responses and defense mechanisms, while gibberellins regulate various physiological processes like seed germination and stem elongation. Therefore, all of these options are correct as they are different classes of PGR's.

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.

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.

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.

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.

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.

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.

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.

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.

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.