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Tonicity

Two semi-perm...

Question

Two semi-permeable bags containing 2 $%$ sucrose placed in two beakers, 'P' containing water and 'Q' containing 10 $%$ sucrose. Which one of the following outcomes is true?

A

Bag in 'P' becomes flaccid due to exosmosis

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B

Bag in 'P' becomes turgid due to endosmosis

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C

Bag in 'Q' becomes turgid due to endosmosis

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D

Concentration of sucrose remain unchanged both

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Solution

The correct option is B
Bag in 'P' becomes turgid due to endosmosis

Sucrose is a disaccharide [Glucose + Fructose]
It is non-reducing and non-osmotic sugar so, there will be no change in concentration of sucrose.

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Two semi-permeable bags containing 2 $%$ sucrose placed in two beakers, 'P' containing water and 'Q' containing 10 $%$ sucrose. Which one of the following outcomes is true?

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Q. Five dialysis bags, impermeable to sucrose, were filled with sucrose solution of various concentrations. These were then placed into a beaker of 0.6 M sucrose solution. The bags were weighed every 10 minutes and the percentage change in mass graphed.

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Q. Read the following passage and answer the following questions.
Dialysis tubing is a semipermeable membrane. It allows small molecules, such as water, to pass through easily, while larger molecules, such as sucrose, are restricted. Movement of molecules across the tubing is due to concentration gradients. In an experiment designed to study osmosis, several pieces of dialysis tubing were filled with sucrose solutions of varying concentration and placed in beakers containing distilled water. The rate and direction of water movement was determined by weighing the bags before and after placing them in the distilled water. The data are recorded below.
Table 1

Tube number	Tube contents (beaker contents)	Mass(g) 0 minutes	Mass(g) 15 minutes	Mass (g) 30 minutes	Mass(g) 45 minutes	Mass (g) 60 minutes
1	Distilled water (distilled water)	22.3 g	22.4 g	22.2 g	22.3 g	22.3 g
2	10% sucrose (distilled water)	24.8 g	25.3 g	25.7 g	26.4 g	26.9 g
3	40% sucrose (distilled water)	25.1 g	26.3 g	27.5 g	28.9 g	29.6 g
4	Distilled water (40% sucrose)	22.7 g	21.3 g	20.5 g	19.8 g	18.7 g

Why does the mass of Tube 3 increase while the mass of Tube 4 decreases?

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