When labeling a plate for incubation, where should labels be placed to prevent loss or smearing?

When labeling a plate for incubation, where should labels be placed to prevent loss or smearing?

• A. On the lid
• B. On the bottom of the plate
• C. On the side
• D. On a separate label

Answer: (B)

Labeling the bottom of the plate is the best approach because plates are incubated inverted to keep condensation off the growth. Writing on the lid is prone to being smeared by moisture or rubbing off during handling, and it can detach, making identification unreliable. A label on the bottom stays with the plate, remains legible after incubation, and won’t interfere with the culture or growth conditions since it’s on the exterior surface. Labels on the side or a separate label can easily get obscured, damaged, or separated from the plate, increasing the risk of mix-ups.

Labeling the bottom of the plate is the best approach because plates are incubated inverted to keep condensation off the growth. Writing on the lid is prone to being smeared by moisture or rubbing off during handling, and it can detach, making identification unreliable. A label on the bottom stays with the plate, remains legible after incubation, and won’t interfere with the culture or growth conditions since it’s on the exterior surface. Labels on the side or a separate label can easily get obscured, damaged, or separated from the plate, increasing the risk of mix-ups.