Fig. 1.1 is a diagram of a normal red blood cell. Fig. 1.1 Fig. 1.2 shows three red blood cells that have been placed in different concentrations of a salt solution. Fig. 1.2 Identify the cell that has been placed in a very concentrated salt solution. Give reasons for your answer. cell reasons

Biology

IGCSE&ALevel

CAIE

Exam No：0610_w23_qp_31 Year：2023 Question No：1(b)

Answer:

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

9.4.1 List the components of blood as red blood cells, white blood cells, platelets and plasma

9.4.2 Identify red and white blood cells, as seen under the light microscope, on prepared slides and in diagrams and photomicrographs

9.4.3 State the functions of the following components of blood

9.4.4 Identify lymphocyte and phagocyte white blood cells, as seen under the light microscope, on prepared slides and in diagrams and photomicrographs

9.4.5 State the functions of: – lymphocytes – antibody production – phagocytes – phagocytosis

9.4.6 Describe the process of clotting as the conversion of fibrinogen to fibrin to form a mesh

9.4.7 State the roles of blood clotting as preventing blood loss and preventing the entry of pathogens

9.4.8 Describe the transfer of materials between capillaries and tissue fluid (details of the roles of water potential and hydrostatic pressure are not required)

Fig. 1.1 is a diagram of a normal red blood cell. Fig. 1.1 Fig. 1.2 shows three red blood cells that have been placed in different concentrations of a salt solution. Fig. 1.2 Identify the cell that has been placed in a very concentrated salt solution. Give reasons for your answer. cell reasons

Answer:

Knowledge points:

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