30 Questions
What is the method to stop the enzyme that causes browning reaction in fruits?
Soak the slices in salt water
What is the result of chemical changes in fruits and vegetables?
Colour and flavour of foods are affected
What is the main function of conducting cells in plants?
To distribute water and salts throughout the plant
What is the main component of the cuticle that makes it water-impermeable?
Cutin
Why does the red pigment in meat turn brown when exposed to oxygen?
Due to chemical changes
Which organelle is responsible for metabolism in plant cells?
Mitochondria
What is the purpose of immersing the cuts in cold water?
To limit the access of oxygen
What is the result of fats and pigments in food being affected by chemical changes?
Unpleasant smell and taste of cooking oil
What is the main function of stomata in plant leaves?
To allow gas exchange and moisture regulation
Where can micro-organisms be found?
In air, water, on most of the foods and our hands, etc.
What is the main component of the cell wall that provides structural support?
Cellulose
Which part of the plant cell contains water-soluble pigments?
Vacuole
What is the primary reason sun drying of fruits was originally limited to certain fruits?
They have high sugar content
What is an advantage of dehydration over sun drying in terms of weather?
Dehydration is not dependent on weather
What is the purpose of sulphuring in the process of drying fruits?
Not mentioned in the text
What is the final step in the process of drying fruits?
Packaging in air tight tin containers
Why is shade drying used for drying fruits?
To prevent direct sunlight
What is the result of uniform drying temperature in dehydration?
The colour of fruits remains uniform
Why is it necessary to dry the air before re-circulating it in the drying process?
To prevent the air from becoming saturated with moisture
What is the typical drying time for fruit and vegetable pieces?
10-20 hours
What is the main construction feature that distinguishes tunnel driers from other types of driers?
Direction of air flow relative to tray movement
In a tunnel drier, what happens to the air as it moves through the tunnel?
It becomes cooler and more humid
What is the advantage of the counter flow or countercurrent principle in tunnel driers?
It ensures the hottest and driest air contacts the nearly dry product
What is the characteristic feature of a belt trough drier?
The belt forms a trough
What is the highest Brix level that can be achieved on a commercial scale?
4555°Brix
What is the purpose of centrifuging fruit juice in the serum concentration process?
To separate the solid phase from the liquid phase
What is the minimum pressure required for Reverse Osmosis (RO) to occur?
Greater than its osmotic pressure
Which method of concentration retains the flavor profile of the concentrated material?
Freeze concentration
What is the oldest method of deriving salt from sea water?
Solar concentration
What is the primary purpose of thermal processing in fruit juice concentration?
To increase the shelf life of the juice
Learn about the different types of plant cells, including conducting cells, supporting cells, and their roles in plant growth and development. Discover the importance of cellulose, lignin, and pectic substances in plant structure.
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