FOOD week 6-2 Postharvest management and quality of Food

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47 Questions

Which factor can affect the taste of different cultivars?

Genetics

What effect does cool temperature have on banana fruit filling?

Slowed degreening

Which nutrient increases the acidity in citrus?

Nitrogen

What is the main cause of internal dryness in Imperial mandarins?

Granulation

What happens to the juice sacs in mandarins affected by internal dryness?

They become granular and opaque white

Which method is NOT used for postharvest temperature management?

Freezing

What is the optimal temperature for chilling insensitive produce?

-3 to -0.5°C

Which region is more likely to have chilling sensitive produce?

Tropical

What is the arbitrary threshold temperature between chilling sensitive and insensitive produce?

12°C

Which factor is NOT part of the transport cold chain for temperature management?

Refrigerated distribution & retail

Which organic acids are stored in the vacuole of fruits and vegetables?

Citric and malic acid

What happens if the tonoplast (vacuolar membrane) is damaged during storage?

Leakage of acids damages the cell

Which method can be used to suppress ethylene and slow down ripening?

All of the above

Which fruits require a storage temperature of 7°C?

Avocado, pepper, pineapple, pomegranate, snap bean

What is the purpose of administering ethylene to fruits like tomatoes and avocados?

To induce ripening

Which gas is used as an ethylene inhibitor to delay ripening and fruit drop in some plants?

1-MCP

At what concentration can ethylene have a detrimental effect on produce shelf-life and quality?

0.5 ppm

Which ethylene scrubber is starting to be incorporated into active packaging?

KMnO4

What is the registered trade name for Aminovinylglycine (AVG), an ethylene inhibitor applied preharvest to delay ripening and fruit drop in some plants?

ReTain

When should ReTain be applied to delay apple maturity and allow further growth?

21-28 days prior to harvest

Which pigmented phytochemical is responsible for the green color in plants?

Chlorophyll

Which pigmented phytochemicals are responsible for the red/orange color in plants?

Carotenoids

Which pigmented phytochemicals are responsible for the yellow color in plants?

Carotenoids

Which pigmented phytochemicals are responsible for the red/mauve/blue/purple color in plants?

Anthocyanins

What causes the yellowing of bananas during ripening?

Loss of chlorophyll

What causes the yellowing of bananas during ripening?

Loss of chlorophyll

Which pigmented phytochemicals are responsible for the red/orange color in plants?

Carotenoids

What is the purpose of administering ethylene to fruits like tomatoes and avocados?

To delay ripening

Which of the following is a cause of enzymatic browning in fruits and vegetables?

Physical damage due to mishandling

Which factor is mainly associated with transportation damage in fruits and vegetables?

Vibration

Which fruit is particularly challenging to handle postharvest due to its shape?

Banana

Which of the following is most closely associated with the firmness and texture of fruits and vegetables?

Cell wall structure and composition

Which components make up the primary cell walls in plants?

Cellulose microfibrils and pectins

What is a common mechanism for modifying cell wall structure and strength during ripening?

Depolymerisation of matrix glycans

What is the main cause of textural change in fruits and vegetables during storage?

Desiccation

What are the consequences of water loss in produce during storage?

Shrivelling, softening, loss of appearance, loss of saleable weight, toughening

Which factor affects the rate of water loss in produce during storage?

Surface area to volume ratio

What are the two main factors that determine a fruit's characteristic flavor?

Sugar/acid balance and production of aroma volatile compounds

What is the purpose of GC-MS in analyzing ripe fruit?

To identify volatile compounds contributing to flavor and aroma

What is the role of diacetyl in fruit flavor?

Imparts a buttery flavor

What is the role of furaneol in fruit flavor?

Imparts a strawberry flavor

How many volatile compounds may a ripe fruit contain that contribute to its flavor and aroma?

>100

Which of the following factors can affect the flavor of fruits and vegetables?

Genetics and environment

What happens to the synthesis of aroma volatiles during the ripening process?

It increases dramatically

How does the time between harvest and eating affect the flavor of fruits and vegetables?

It decreases the flavor

What can cause off-odours in fruits and vegetables during the postharvest period?

Fermentative metabolism

What is the difference between the shelf-life of flavor and appearance in fruits and vegetables?

Appearance shelf-life is longer

Test your knowledge on preharvest factors that affect the quality of crops! Explore how genetics, climate, crop nutrition, and agronomy techniques can influence the taste, shape, sweetness, acidity, and photosynthesis of various crops. Gain insights into the impact of preharvest factors on crop quality with this informative quiz!

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