Growth on the MSA and NA plates was recorded as "good growth," "poor growth," or "no growth." These are qualitative and, at least for the first two, subjective terms. What did you use to establish what constituted "good growth?"

Interpretation: Organism inhibited by salt (poor growth )

Organims : Not Staphylococcus (poor growth)

Interpretation: Organism not inhibited by salt (good growth)

Organism: Staphylococcus (good growth)

Explanation:

MSA (Mannitol salt agar) (Differential and selective) :

It is selective because only Staph can grow , differential because S.aureus  ferments mannitol (turns it yellow) but STAPH EPIDERMIDIS doesn't ferment mannitol.There is no growth or fermentation of M.luteus.

Nutrient agar contains 2% agar added to nutrient agar commonly used. Its concentration can be increased to 6% to prevent swarming can be reduced to 0.5%.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

answer; observing;