2005

4551/1 Movement of substances across the plasma membrane Biology Paper 1

CHAP 3: MOVEMENT OF SUBSTANCES ACROSS THE PLASMA MEMBRANE Year200320042005200620072008

Quantity321423

YEAR 2003

1. Figure 3 shows a comparison of ion concentration in pond water and in the cell sap of Nitella sp.

Which process causes the ion concentration in Nitella sp. to be higher than that in pond water?

A Osmosis

B Plasmolysis

C Active transport

D Passive transport

2.A student soaked a duck egg in a saturated salt solution. After a few days, he found that the egg tasted salty.

Which of the following statements explain this phenomenon?

IThe egg shell and membrane are permeable to salt

IISalt particles diffuse into the egg

IIISalt particles enter the egg by active transport

IVSaturated salt solution is hypertonic to the egg

A I and IV only

B II and III only

C I, II and IV only

D I, II, III and IV3.Figure 26 shows an experiment on the movement of molecules across a semi-permeable membrane

What are solutions P, Q and R

PQR

A1 mol dm-3 sucrose solutionDistilled water0.5 mol dm-3 sucrose solution

B1 mol dm-3 sucrose solution0.5 mol dm-3 sucrose solutionDistilled water

CDistilled water1 mol dm-3 sucrose solution0.5 mol dm-3 sucrose solution

DDistilled water0.5 mol dm-3 sucrose solution1 mol dm-3 sucrose solution

YEAR 2004

1. What are the processes involved in the movement of water and mineral ions into root hairs?

Water

Mineral ions A Osmosis

Active transport

B Osmosis

Facilitated diffusionC Facilitated diffusion

OsmosisD Active transport

Osmosis2. The diagram shows diffusion through a partially permeable membrane.

What are X and Y?

XYA Sucrose solution 20%Distilled water

B Distilled waterDistilled water

C Sucrose solution 20%Sucrose solution 20%

D Distilled waterSucrose solution 20%YEAR 20051. The graph shows the changes in mass of potato strips immersed in different

concentrations of sucrose solution.

Based on the above graph, which of the following concentrations of sucrose solution should be used so that a flaccid potato strip regains its turgidity?

A 1.5 g per 100 mlC 3.5 g per 100 m/

B 2.5 g per 100 m/D 4.5 g per 100 m/YEAR 20061. Which of the following onion cells were immersed in a hypotonic solution?

2. Diagram 2 shows an experiment to investigate the movement of substances through a visking tube.

What is the process that takes place in Diagram 2?

A Osmosis

B Active transportC Facilitated diffusionD Passive transportation3. Cucumber slices are immersed in 0.1% solution. After 3 hours, the slices are found to be turgid and hard.

Which of the following statements explains this phenomenon?

A The cucumber cell wall prevents it from shrinking.B The cell sap is hypotonic towards the sucrose shrinkingC The high concentration of the cell sap in the vocule causes water to diffuse inD The cucumber cell wall allows the sucrose molecules to diffuse into the cell4. A plant cell is immersed in distilled water.Which of the following is true about the movement of water molecules in the early stage?A The rate of water molecules exiting the cell is higher than entering the cellB The rate of water molecules entering the cell is higher than exiting the cell

C No water molecules are entering or exiting the cellD The rate of water molecules entering and exiting the cell is the same YEAR 20071. Diagram 2 shows a plant cell which has been put into a particular solution.

Which is experienced by the cell?

A Plasmolysis

B Haemolysis

C Deplasmolysis

D Crenation

2. Diagram 3 is a graph showing the result of an experiment to determine the concentration of the cell sap of potatoes.

At which point A, B, C or D, is the concentration of the cell sap of the potatoes?YEAR 2008

1. A cell is immersed in distilled water for 20 minutes. It is then taken out and immersed in 30% sucrose solution.

Table I shows the observed condition of the cell.

If the cell is put back into the distilled water for 20 minutes, which condition of the cell would be expected?

2 Diagram 2 shows the movement of molecule X across the plasma membrane through process Y.

What is process X?A. Osmosis

B. Simple diffusion

C. Active transport

D. Facilitated diffusion

3. Diagram 3 shows the initial level of 10% sucrose solution in a capillary tube before an experiment.

Which graph shows how the level of sucrose solution in the capillary tube changes during the experiment?

Figure 3

Figure 26

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