Fig. 2.1 is a photograph of a cross-section of a root from a carrot plant, Daucus carota. A student investigated the effect of the concentration of a salt solution on the mass of carrot cubes. The student used this method: - $$$\quad$$$ Carrots were cut into cubes. Each side of the cube was $$$1 \mathrm{~cm}$$$ in length. - The initial mass of each carrot cube was measured and recorded. - Each carrot cube was put into a different concentration of salt solution. - The carrot cubes were left in the salt solutions for one hour. - After one hour, the carrot cubes were removed from the salt solution and dried with a paper towel. - The final mass of each carrot cube was measured and recorded. Using your graph, estimate the concentration of salt solution at which there is no change in the mass of the carrot cube. Show on the graph how you obtained your estimate. mol per $$$\mathrm{dm}^{3}$$$

Biology

IGCSE&ALevel

CAIE

Exam No：0610_s23_qp_51 Year：2023 Question No：2(b)(v)

Answer:

answer consistent with the line on the candidate's graph ;
intercept clearly indicated on the graph ;

Knowledge points:

3.2.1 State that water diffuses through partially permeable membranes by osmosis

3.2.10 Explain the importance of water potential and osmosis on animal cells and tissues

3.2.11 Explain how plants are supported by the turgor pressure within cells, in terms of water pressure acting against an inelastic cell wall

3.2.2 State that water moves in and out of cells by osmosis through the cell membrane

3.2.3 Investigate and describe the effects on plant tissues of immersing them in solutions of different concentrations

3.2.4 State that plants are supported by the pressure of water inside the cells pressing outwards on the cell wall

3.2.5 State that plants are supported by the pressure of water inside the cells pressing outwards on the cell wall

3.2.6 State that plants are supported by the pressure of water inside the cells pressing outwards on the cell wall

3.2.7 Define osmosis as the net movement of water molecules from a region of higher water potential (dilute solution) to a region of lower water potential (concentrated solution), through a partially permeable membrane

3.2.8 Explain the effects on plant tissues of immersing them in solutions of different concentrations by using the terms turgid, turgor pressure, plasmolysis and flaccid

3.2.9 Explain the importance of water potential and osmosis in the uptake of water by plants

Answer:

Knowledge points:

Solution:

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