why are bacterial agar plates turn upside-down when they are placed in the incubator to grow
Petri dish Petri plates are incubated upside-down to lessen the risk of contamination from airborne particles settling on them and to prevent the accumulation of any water condensation that may otherwise disturb or compromise a culture.
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Seed Seeds are the product of the ripened ovule, after fertilization by pollen and some growth within the mother plant. The embryo is developed from the zygote and the seed coat from the integuments of the ovule.
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.