Sarah wanted to find out if temperature has an effect on the growth of bread mol

Question

Sarah wanted to find out if temperature has an effect on the growth of bread mold. She grew the mold in nine Petri dishes containing the same amount and type of nutrients. Three were kept at 0 degree C, three were kept at 90 degree C, and three were kept at room temperature, 27 degree C. The containers were examined and the growth of the bread mold was recorded each Friday for five weeks. i. Which of the following is her hypothesis? a. If the number of containers changes, then the amount of bread mold will change. b. If the amount of nutrients is changed, then the amount of bread mold will change. c. If there are different types of nutrients used, then that will cause differences in the amount of bread mold.

Explanation / Answer

The availability of mold spores, a suitable medium, temperature , pH ,aeration, nutrients and moisture are basic requirements for the growth of bread mold.

Three containers are at 00 C, three are at 900C and three at 300C.

Mold can grow at room temperature but many molds prefer a slightly elevated temperature.

The molds require a water activity of 70% to grow properly

Her best hypothesis is 'c'

Nutrients : Nutrient requirements for moulds may vary from mould to mould.

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