This set of Fruits Processing Multiple Choice Questions & Answers (MCQs) focuses on “Modified Atmosphere Packaging”.
1. Which of the following gas is not used in modified atmosphere packaging?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Argon
View Answer
Explanation: The gases used in modified atmosphere packaging consist of a nitrogen, carbon dioxide, argon or helium. These are injected and frequently removed multiple times to eliminate oxygen from the package. The gas should not react with the food product.
2. Why nitrogen is flushed in packaged food stuff?
a) Replaces the oxygen
b) Increases the respiration
c) Decreases relative humidity
d) Increases relative humidity
View Answer
Explanation: Nitrogen flushing is one of the methods used for preserving the food. It protects food during transportation, shipping and also storing. Oxygen gas is substituted with the nitrogen in packaging container. It also helps in cushioning the product. Nitrogen is an inert gas therefore does not react with the product. It will not affect the characteristics of the product.
3. What is the advantage of modified atmosphere packaging?
a) Increases the shelf life
b) Increases the respiration
c) Decreases relative humidity
d) Increases relative humidity
View Answer
Explanation: There are many advantages of modified atmosphere packaging in fruits and vegetables. It ensures the microbiological limit in the product. It maintains the sensory quality of the product, like the color, odor and palatability.
4. The higher the carbon dioxide concentration the longer the durability of the perishable food.
a) True
b) False
View Answer
Explanation: Carbon dioxide inhibits the increase of most aerobic bacteria. It is the most important gas in the packaging of food under modified atmospheres. The higher the carbon dioxide concentration in the product will have the longer the durability of the perishable food.
5. Which of the following is not the novel modified atmosphere packaging (MAP)?
a) High oxygen MAP
b) Ammonium MAP
c) Nitrous oxide MAP
d) Argon MAP
View Answer
Explanation: The novel gases that are used in the MAP process are high oxygen MAP, argon and nitrous oxide MAP. High oxygen MAP was found to be particularly inhibiting the enzymic discolorations. It prevents anaerobic fermentation reactions and inhibits the microbial growth. Argon and nitrous oxide are classified as miscellaneous additives are used in food products.
6. Small amount of oxygen is used in modified atmosphere packaging.
a) True
b) False
View Answer
Explanation: Oxygen is generally useful for the growth of microorganisms. It should be excluded from modified atmosphere packaging gases but in some cases a level of it can bring positive results in food preservation. It keeps the natural color of the perishable food. It makes possible respiration for fruits or vegetables.
7. Are these statements about the modified atmosphere packaging true?
Statement 1: Longer durability of perishable food.
Statement 2: The product retains its vitamin content, taste and fat content.
a) True, False
b) True, True
c) False, True
d) False, False
View Answer
Explanation: Advantages of modified atmosphere packaging are longer durability of perishable food and decreases spoilage of the product. It reduces the growth of germs. The product retains its form and texture. The product retains its vitamin content, taste and fat content. The natural color of the product is preserved.
8. Are these statements about the modified atmosphere packaging, correct?
Statement 1: Capital cost of gas packaging machinery is high.
Statement 2: Cost of analytical equipment to ensure that correct gas mixtures are being used is high.
a) True, False
b) True, True
c) False, True
d) False, False
View Answer
Explanation: Disadvantages of modified atmosphere packaging are high capital cost of gas packaging machinery and high cost of gases and packaging materials. The cost of analytical equipment to ensure that correct gas mixtures are being used. Cost of quality assurance systems to prevent the distribution of leakers is high.
9. What is the advantage of high oxygen modified atmosphere packaging?
a) Inhibits the enzymatic browning
b) Increases the shelf life
c) Destroys the microbes
d) Inhibits the enzymatic browning, destroys microbes and increases the shelf life
View Answer
Explanation: High oxygen levels are found to be operative in hindering the enzymatic browning process. High Oxygen MAP was found to inhibit the growth of several generic groups of bacteria, yeasts and also a range of food pathogenic organisms. It increases the shelf life of the product.
10. Which of the following method is called gas flushing method?
a) Modified atmosphere packaging
b) Aseptic packaging
c) Biodegradable packaging
d) Edible packaging
View Answer
Explanation: Modified Atmosphere Packaging is more versatile. It is sometimes called gas flushing or reduced oxygen packaging. It increases the shelf life of the product. It destroys the microbial activity by removing the oxygen.
11. What factors that affect passive modified atmosphere packaging?
a) Respiration
b) Moisture content
c) Packaging material
d) Pressure
View Answer
Explanation: In passive modified atmosphere packaging, the high concentration of carbon dioxide and low oxygen levels in the package is achieved over time as a result of respiration of the product and gas transmission rates of the packaging film. This method is commonly used for fresh respiring fruits and vegetables.
12. How modified atmosphere packaging reduces the rate of respiration?
a) High temperature
b) High levels of oxygen
c) Increase levels of carbon dioxide
d) High pressure
View Answer
Explanation: In general, the rate of respiration can be reduced by keeping the temperature low. It can also be achieved by having lower levels of oxygen in the packaging atmosphere. There should also have increased levels of carbon dioxide.
13. What is the other name for reduced oxygen packaging?
a) Modified atmosphere packaging
b) Aseptic packaging
c) Vacuum packaging
d) Edible packaging
View Answer
Explanation: Reduced oxygen packaging is defined as process of storing the food into a packaging container or box where the oxygen is removed from it. It helps in keeping food fresher. Vacuum packaging plays an integral part in reduced oxygen packaging process.
Sanfoundry Global Education & Learning Series – Fruits Processing.
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