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Related Flashcards
Cards In This Set
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What is the primary pigment in photosynthesis and what colour light does it absorb?
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The blueish green pigment called chlorophyl a. It absorbs violet-blue light and orange-red light. It reflects green light hence the colour.
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What do accessory pigments do?
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They can absorb different wavelength of light and then pass the energy on to the primary pigment. They are different in colour because they absorb (and reflect) different wavelength of visible light.
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What is florescence?
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When a substance absorbs radiant energy and immediately re-emits a part of it in wavelengths that are longer than those that were absorbed.
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What colours are each of the following pigments and what colour do they each absorb? chlorophyl b, chlorophyl c, carotenoids, xanthophyll, fucoxanthin and phycocyanin.
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-chlorophyll b- is greenish yellow and absorbs blue-chlorophyll c- is pale green and absorbs red-carotenoids-are orange and absorb blue to ultraviolet-xanthophyll are yellow and absorb blue-fucoxanthin are orange-brown and absorb blue-green to yellow-green.-phycocyanin- are pale blue and absorb orange and yellow.
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What pigments are land plants and chlorophytes made of?
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Chlorophyll a, chlorophyll b, xanthophyll and carotene
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What pigments are brown algae composed of?
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Chlorophyll a, chlorophyll c, fucoxanthin and carotene
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What taxa are composed of chlorophyll a, xanthophyll, phycocyanin and carotene?
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Cyanobacteria.
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Close to half of global photosynthesis is done by what?
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Phytoplancton.
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What is a reason for cells to produce starch?
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Since starch is too large to leave the cell, if cells want to store sugar locally they will make the sugar into starch.
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What stain did we use to see the starch in the cells?
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Iodine.
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How does paper chromatography work?
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It uses a solvent (mobile phase) in which the mixture is disolved and a high quality filter paper (stationary phase) over which the solvent travels. Components travel with the solvent and drop off at different distances depending on their solubility in the solvent.
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What is a retention factor?
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A measure of how long the component travels with the solvent. It is measure by the distance the component travels over the distance the solvent travels.
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What did we use as an indicator for the rate of photosynthesis in the lab?
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The oxygen produced.
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What was used to measure the oxygen produced by the plant?
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Manometer. Photosynthesis creates bubbles of oxygen on the plant which will displace the amount of water which we can measure with graduated pipettes. The change in liquid level in the pipette measures the oxygen evolution and thus the rate of photosynthesis.
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What was sodium bicarbonate used as in the manometer experiment?
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A rich source of carbon dioxide.
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