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30. Freeze drying is a preservation method. Which of the following statement is/are true

31.

32.

33.

34.

35.

about freeze dried products ?

i. Material does not shrink and retain original size.
ர்‌. Materials are porous and brittle.

ii. Heat damage and nutrient loss is very less.

iv. When soaked it absorbs upto 95% of the original water content.
A) All the above 8) Onlyi, iiandiii ©) Onlyi,iiandiv 70) Only iiandiii

Icing is a common method of fish preservation. Which of the given actions is/are
occurring during icing ?

i. enzyme action is slowed down
ர்‌. temperature of fish is lowered to -3 degree C
iii. ice melts by absorbing heat from fish
iv. bacterial activities are reduced
A) allthe above 8) only i, ii and iii C) only ii and iv 0) only i, ॥ and iv

Solid form of carbon dioxide is referred as
A) gel ice B) flake ice C) dry ice D) wet ice

In ideal icing practice, ice and fish are put in alternative layers. Which of the following
statement is/are true about this method ?

i. the bottom layer should be fish and top layer should be ice.

ர்‌. the height of the fish ice mixture should not exceed 1 metre.
iii. the ice and fish ratio is 1 : 1.

A) only ii and iii 8) only i and ii C) only iand iii 0) all the above
From the given methods of icing and storage in fishing vessels, which is the most
economical in terms of space ?

A) heaping B) boxing C) bulking D) shelving

Which of the following statement is incorrect about RSW system ?
A) more fishes can be stored per unit volume

B) no pressure is exerted on fishes

C) temperature cannot be reduced below 0 degree C
)

D) penetration of salt occur during preservation

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