The table below shows the concentration of some ions in pond water and in the cell sap of an aquatic plant: a) Name the process by which potassium ions could be taken by this plant. b) State one condi

here are the answers to questions 7, 8, and 9:

7. The table below shows the concentration of some ions in pond water and in the cell sap of an aquatic plant:

   Ion	Concentration in pond water (Parts per million)	Concentration in Cell Sap (Parts per million)
   Sodium	50	30
   Potassium	2	150
   Calcium	1.5	1
   Chloride	180	200

   • a) Name the process by which potassium ions could be taken by this plant.
     • Active transport
   • b) State one condition necessary for the process named in (a) above to take place.
     • Presence of energy (ATP) / Respiration

8. a) A student was viewing a slide preparation of a cheek cell under high power of microscope. The feature was blurred.

   • i) Name the part of the microscope that the student would use to obtain a sharper outline of features.
     • Fine adjustment knob
   • b) Give the formula used to calculate magnification in a light microscope. $$\text{Magnification} = \frac{\text{Image size}}{\text{Actual size}}$$ or $$\text{Magnification} = \text{Eyepiece lens magnification} \times \text{Objective lens magnification}$$

9. The diagram below represents an organ from a bony fish.

   • a) Name the organ.
     • Gill