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The portion of the cell is absent in Rhizopus stolonifer with the exception of the reproductive cells is septa, the internal crosswalls. It functions as a wall that divides cavities into smaller ones. I hope my answer has come to your help. God bless and have a nice day ahead!

Answer:

Septa and the internal crosswalls.

Explanation:

Rhizopus stolonifer, also known as the black bread mold, is a fungus in the Mucoraceae family that causes soft rot in plants and fruits. This fungus is widely distributed worldwide and can often be viewed on bread and lemon surfaces. Unlike most fungi, Rhizopus stolonifer's cells lack the septa and the internal crosswalls.

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