CAIE IGCSE Biology 3.2.5 Effects on Plant Tissues of Immersing Questions

Practise predicting and explaining how plant tissues respond to solutions of different concentrations.

Exam points

investigate and describe how plant tissues change when immersed in solutions of different concentrations

[Maximum number: 1]

Some students investigated osmosis in raw potato sticks.

The students measured the mass of four of the potato sticks using an electronic balance.

Fig. 4.1 shows an electronic balance.

Fig. 4.1

The students left each potato stick in one of four different liquids for 5 hours:
- distilled water
- 0.1 mol per $\mathrm{dm}^{3}$ sodium chloride solution
- 0.5 mol per $\mathrm{dm}^{3}$ sodium chloride solution
- 1.0 mol per $\mathrm{dm}^{3}$ sodium chloride solution.

After 5 hours they measured the mass again and calculated the change in mass.

Predict which of the liquids would cause the largest decrease in mass of a potato stick.

1.0 (mol dm ${ }^{-3}$ sodium chloride solution) ;

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CAIE IGCSE Biology 3.2.5 Effects on Plant Tissues of Immersing Questions question 1