Practicals
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Describe how she can use these materials to separate the photosynthetic pigments by chromatography
Draw line/origin on (chromatography) paper (using ruler and pencil); 2. (Use pipette/tubing/dropper to) add chlorophyll/solution to origin/line; 3. Add solvent/A below line/origin; 4. Remove/stop (from glassware) before solvent reaches end (of chromatography paper) OR Mark (position) where solvent reaches/front
Using the solvent the student separate the five pigments should then use their methods with a different solvent and separated six pigment. Explain the difference.
For 2 marks = two pigments have same solubility in (solvent) A but different solubility in (solvent) B
Explain why the lids were kept on the Petri dishes.
To prevent/reduce evaporation; 2. (Which) alters concentration of (IAA) solution
Describe and explain the results shown in Table 1 and suggest how the results might have differed if lengths of root had been used. [3 marks]
Increase in IAA concentration the higher/greater the mean (change in) length; 2. (High) IAA stimulates cell elongation; 3. In roots, growth/elongation less/inhibited;