Plant Cell Types and Structures

What is the method to stop the enzyme that causes browning reaction in fruits?

Limit the access of oxygen
Cover the fruits immediately with a plastic wrap
Immerse the cuts in cold water
Soak the slices in salt water (correct)

What is the result of chemical changes in fruits and vegetables?

Unpleasant smell and taste of cooking oil
Colour and flavour of foods are affected (correct)
Colour and flavour of foods remain unchanged
Fats and pigments in food are not affected

What is the main function of conducting cells in plants?

To provide structural support
To synthesis vitamins and amino acids
To produce enzymes for metabolism
To distribute water and salts throughout the plant (correct)

What is the main component of the cuticle that makes it water-impermeable?

Cutin (D) Signup and view all the answers

Why does the red pigment in meat turn brown when exposed to oxygen?

Due to chemical changes (C) Signup and view all the answers

Which organelle is responsible for metabolism in plant cells?

Mitochondria (D) Signup and view all the answers

What is the purpose of immersing the cuts in cold water?

To limit the access of oxygen (C) Signup and view all the answers

What is the result of fats and pigments in food being affected by chemical changes?

Unpleasant smell and taste of cooking oil (A) Signup and view all the answers

What is the main function of stomata in plant leaves?

To allow gas exchange and moisture regulation (A) Signup and view all the answers

Where can micro-organisms be found?

In air, water, on most of the foods and our hands, etc. (C) Signup and view all the answers

What is the main component of the cell wall that provides structural support?

Cellulose (B) Signup and view all the answers

Which part of the plant cell contains water-soluble pigments?

Vacuole (A) Signup and view all the answers

What is the primary reason sun drying of fruits was originally limited to certain fruits?

They have high sugar content (A) Signup and view all the answers

What is an advantage of dehydration over sun drying in terms of weather?

Dehydration is not dependent on weather (C) Signup and view all the answers

What is the purpose of sulphuring in the process of drying fruits?

Not mentioned in the text (C) Signup and view all the answers

What is the final step in the process of drying fruits?

Packaging in air tight tin containers (D) Signup and view all the answers

Why is shade drying used for drying fruits?

To prevent direct sunlight (B) Signup and view all the answers

What is the result of uniform drying temperature in dehydration?

The colour of fruits remains uniform (D) Signup and view all the answers

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 (D) Signup and view all the answers

What is the typical drying time for fruit and vegetable pieces?

10-20 hours (D) Signup and view all the answers

What is the main construction feature that distinguishes tunnel driers from other types of driers?

Direction of air flow relative to tray movement (A) Signup and view all the answers

In a tunnel drier, what happens to the air as it moves through the tunnel?

It becomes cooler and more humid (B) Signup and view all the answers

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 (D) Signup and view all the answers

What is the characteristic feature of a belt trough drier?

The belt forms a trough (D) Signup and view all the answers

What is the highest Brix level that can be achieved on a commercial scale?

4555°Brix (D) Signup and view all the answers

What is the purpose of centrifuging fruit juice in the serum concentration process?

To separate the solid phase from the liquid phase (B) Signup and view all the answers

What is the minimum pressure required for Reverse Osmosis (RO) to occur?

Greater than its osmotic pressure (C) Signup and view all the answers

Which method of concentration retains the flavor profile of the concentrated material?

Freeze concentration (B) Signup and view all the answers

What is the oldest method of deriving salt from sea water?

Solar concentration (A) Signup and view all the answers

What is the primary purpose of thermal processing in fruit juice concentration?

To increase the shelf life of the juice (D) Signup and view all the answers