Plant Growth Regulators (PGRs) are synthesized compounds that regulate plant growth similar to naturally produced hormones.

• A. Natural nutrients required for growth
• B. Synthesized compounds that regulate plant growth similar to hormones
• C. Insecticides used on crops
• D. Soil conditioners

Answer: (B)

Plant Growth Regulators are synthesized compounds that regulate plant growth by mimicking natural plant hormones, influencing processes such as elongation, flowering, rooting, and fruit development. This direct action on hormonal signaling explains why the description that PGRs are synthesized compounds regulating growth similar to hormones is the best fit. They are not nutrients, which supply elements for growth; they are not insecticides, which protect against pests; and they are not soil conditioners, which modify soil properties.