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7. (a) (i) Use values from the graph to describe the difference in absorption spectra of the pigments from treated and untreated plants - Scottish Highers Biology - Question 7 - 2018
Question 7
7. (a) (i) Use values from the graph to describe the difference in absorption spectra of the pigments from treated and untreated plants. (ii) Use evidence from the t... show full transcript
Worked Solution & Example Answer:7. (a) (i) Use values from the graph to describe the difference in absorption spectra of the pigments from treated and untreated plants - Scottish Highers Biology - Question 7 - 2018
Step 1
Use values from the graph to describe the difference in absorption spectra of the pigments from treated and untreated plants.
Answer
The graph shows that treated plants have a greater absorption of light between 450-600 nm. This suggests that the pigments in the treated plants are more effective in absorbing light within this wavelength range compared to the untreated plants.
Step 2
Use evidence from the table to explain the difference in the absorption spectra.
Answer
The table indicates that the treated plants have a higher carotenoid content (3.98 mg/g of leaf) compared to the untreated plants (3.02 mg/g of leaf). This higher concentration of carotenoids, which are accessory pigments, correlates with the increased absorption of light in the relevant wavelength range.
Step 3
Step 4
Suggest why seeds from the plants treated with PBZ yield more oil.
Answer
Plants treated with PBZ likely have enhanced photosynthetic efficiency, leading to greater energy production and, therefore, more energy available for oil synthesis. This increased oil yield can be attributed to the higher metabolic activity and energy availability produced during photosynthesis.