Question

What is the approximately average protein content (on dry weight basis ) in potato ?

• A. 5 %
• B. 10 %
• C. 15 %
• D. 20 %

Hint:

Potato composition:
Fresh weight: Mostly water (70-80%), carbohydrates (starch), and about 1-2% protein.
Dry weight: When water is removed, the percentage of other components increases. Protein content on a dry weight basis is typically around 8-12%, averaging near 10%.

Answer 1

The Correct Option is B

Potatoes are primarily a source of carbohydrates (starch). Their protein content is relatively modest. When considering protein content on a dry weight basis, it will be higher than on a fresh weight basis because water (which constitutes a large portion of fresh potato, around 70-80%) is removed.
On a fresh weight basis, potato protein content is typically around 1-2%.
On a dry weight basis, the protein content of potato tubers generally ranges from about 8% to 12%, with an average often cited around 10%. Some sources might give slightly lower or higher ranges depending on variety, growing conditions, and analytical methods. Let's look at the options:
(1) 5%: This is too low for a dry weight basis.
(2) 10%: This falls within the generally accepted average range for potato protein on a dry weight basis.
(3) 15%: This is generally on the higher side of the typical range.
(4) 20%: This is too high for the average protein content of potatoes, even on a dry weight basis. Therefore, approximately 10% is the most appropriate average protein content for potato on a dry weight basis. 10 %