Q1. In Tal prolong, fruits are coated by ________.

1. Palm oil
2. Nylon
3. CMC
4. Acetic acid

ANSWER: C. CMC

• Explanation – A method of covering fruits to keep them from ripening is known as tal prolongation. Fruits are coated with carboxymethyl cellulose in this procedure (CMC). Carboxymethyl cellulose (CMC) is a water-soluble anionic polysaccharide with a linear, long chain. Purified CMC is a tasteless, odorless, free-flowing powder that is white to cream in color.

READ MORE – Food Science & Technology Quiz (13-02-2022)

Q2. _______ is used as an active substance for moisture scavenging in an active packaging system for maize to reduce aflatoxin contamination.

1. Bentonite
2. Sodium polyacrylate
3. Calcium chloride
4. Sodium chloride

ANSWER: B. Sodium polyacrylate

• Explanation: The use of poly (acrylic acid) sodium salt for grain drying has the potential to reduce aflatoxin contamination, especially in developing nations. Bentonite, calcium chloride and sodium chloride are some of the active ingredients used to reduce moisture content and browning index in mushrooms and other materials.

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Q3. Which of the following satisfies the conditions of ultra-low oxygen (ULO) storage?

1. 1 to 1.5% O2, 4 to 5% CO2
2. 1 to 1.5% O2, 2 to 3% CO2
3. 0.5 to 1% O2, 4 to 5% CO2
4. 0.5 to 1% O2, 2 to 3% CO2

ANSWER – D. 0.5 to 1% O2, 2 to 3% CO2

• Explanation: The ULO storage system is a gastight coldstore made of high-quality insulated panels. Controlled atmosphere (CA) storage is the process of lowering oxygen levels while increasing CO2 levels. ULO storage refers to storing at a very low oxygen level. At 1°C–2°C, with levels of 0.5% –1% O2 and 2% –3% CO2, the ULO storage uses O2 levels close to the minimum level required for plant tissue maintenance; lower levels will cause disorders such as browning and tissue necrosis, i.e. at 0.5% –1% O2 and 2% –3% CO2.

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Q4. Which of the following chemicals helps in reducing the post-harvest ethylene production in fruits?

1. Ethylene hydrazide
2. 1-Methylcyclopropene
3. Cetylpyridinium chloride
4. Potassium sulfate

ANSWER: B. 1-Methylcyclopropene

• Explanation: 1-Methylcyclopropene (1-MCP) is an ethylene action inhibitor that prevents ripening, softening, and unpleasant color changes in fruits induced by the plant hormone ethylene. Many types of fresh produce, particularly climacteric or ethylene-sensitive produce, are treated with 1-MCP to extend their postharvest life. It inhibits ethylene responses in plant cells by binding to the ethylene receptor competitively. 1-MCP is not only useful as a fumigant but it can also be employed in small quantities. It is mostly used as a preparation before long-term storage.

READ MORE – Food Science & Technology Quiz (13-01-2022)

Q5. Which of the undermentioned ethylene scavenger can be incorporated into a plastic film structure commonly used in fresh produce packaging?

1. Palladium chloride
2. Nanosilver
3. Charcoal
4. Zeolite

ANSWER: D. Zeolite

• Explanation – Minerals like zeolite, active carbon, and pumice can be added to the plastic film structure used in fresh produce packaging. These minerals are designed to scavenge ethylene while also altering the film’s gas permeability, allowing carbon dioxide to diffuse faster and oxygen to enter more easily. Although nanosilver is claimed to be an ethylene blocker, it has only been tested in absorbent pads placed in trays of fresh-cut melon, not in the packaging structure.

READ MORE – Food Science & Technology Quiz (12-04-2022)

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