18 Questions
What percentage of potatoes with perforations or galleries are allowed in the Yellow Potato grade?
10 percent
What is the tolerance for wet rottenness in the Extra grade?
0 percent
What percentage of potatoes with sprouted growth are allowed in the Yellow Potato grade?
3 percent
How are tolerances for different damages or defects referred to in the grading process?
Product weight percentage
What is the criteria for grading potatoes that have been stored?
The same requirements as the present norm
What determines the commercial value of a potato grade?
The larger the potato, the higher the commercial value
What is the minimum size of a white potato to be classified as Extra Grade?
8 cm wide
What percentage of potatoes with contusions are allowed in First Grade potatoes?
10%
What is NOT allowed in Extra Grade potatoes?
Verdant or sprouting potatoes
What is the minimum size of a yellow potato to be classified as Second Grade?
Not specified
What is the main criterion for grading potatoes for consumption?
Sanity and maturity stage
Which of the following defects is allowed in First Grade potatoes?
Perforations or galleries
What is the categorization for potatoes that do not meet the Standard grade requirements?
They are sold at a lower price than Second grade
What is the weight range for First grade seed potatoes?
Tubers among 60 g to 80 g
What is the purpose of drying in post-harvest operations?
To reduce the moisture content of potatoes
What is the advantage of harvesting potatoes in water?
It reduces blue stains and external damage
What is the purpose of curing or conditioning in post-harvest operations?
To heal wounds and reduce moisture loss
What is the diameter range for Second grade seed potatoes in terms of their traverse dimension?
Tubers among 45 to 59 mm
Study Notes
Grading of Potatoes
- Potatoes are classified into grades based on their size, shape, and quality.
- Grades include Extra, First, and Second, with different minimum size requirements for each.
- Extra grade potatoes must be at least 8 cm wide for white potatoes, 7.5 cm for colored potatoes, and 6 cm for yellow potatoes.
- First grade potatoes must be at least 5.5 cm wide for white potatoes, 5 cm for colored potatoes, and 4 cm for yellow potatoes.
- Second grade potatoes have the same minimum size requirements as Extra grade potatoes.
Characteristics of Each Grade
- Extra grade potatoes:
- No perforations, wounds, or cracks
- Less than 5% with contusions
- No verdant or sprouted potatoes
- First grade potatoes:
- Up to 5% with perforations or galleries
- Up to 5% with deformations
- Up to 3% with wounds or courts
- Up to 10% with contusions
- No verdant or sprouted potatoes
- Second grade potatoes:
- Up to 10% with perforations or galleries
- Up to 5% with wounds or courts
- Up to 10% with healing
- Up to 15% with contusions
- Up to 5% verdant potatoes
- Up to 3% sprouted potatoes
- Up to 10% with deformations
Tolerances for Damage
- Permitted tolerances for different types of damage vary by grade
- Examples of tolerated damages include dry and wet rottenness, mechanical damages, plague damage, and physiological damages
Additional Rules
- Up to 10% of product weight can be a different size than suitable for each grade
- Tolerances for damages or defects are based on product weight percentage
- Potatoes with multiple damages or defects are graded individually
- Stored product grade qualification follows the same requirements as fresh product
This quiz covers the tolerances for different types of damage in potatoes, including wounds, galleries, and deformations. Learn about the acceptable percentages of damaged potatoes in post-harvest operations.
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