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10 Cards in this Set
- Front
- Back
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Where does photosynthesis take place?
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Chloroplasts
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How is leaf adapted for photosynthesis (9)?
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Large SA:collect as much sun as possible Leaf arrangement minimises overlapping, avoids shadowing of one leaf to another. Thin, short diffusion pathway. Transparent cuticle and epidermis, light can pass through to mesophyll cells beneath. Long, narrow mesophyll cells, packed with chloroplasts to collect sunlight Many stomata, gas exchange. Stomata, open/close dependant on light intensity. Many air spaces, lower mesophyll cells allow co2/o2 to diffuse. Xylem bring water to leaf/phloem carries sugar from photosynthesis away. |
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What is the structure and role of chloroplasts in photosynthesis?
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Grana stacks of disc like structures called thylakoids, contain pigment chlorophyll. LDR takes place in thylakoids. Stoma fluid filled matrix, LIR takes place. |
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What is light used for start of photosynthesis?
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-phosphorylate ADP into ATP -split water into H+ ions and OH- ions (photolysis) |
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How does energy enter ecosystem? |
Enters as light energy, converted to chemical by photosynthesising organisms.
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Producers?
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Photosynthetic organisms that manufacture, organic substances using light energy. |
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Consumers? |
Obtain their energy by feeding on other organisms, rather than using sunlight directly.
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Decomposers? |
Break down dead/decaying complex matter into simple components.
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Food chain? Web?
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Feeding relationship producers eaten by primary consumers. Food chains linked together. |
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Why is most of suns energy not converted? |
-Over 90% reflected back into space by clouds dust/atmosphere -not all wavelengths used for absorbed for photosynthesis -light might not chlorophyll molecule -limiting factor may limit rate of photosynthesis
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