Question

each of the passages below is an excerpt from a different type of source (textbook, popular science article from a reputable source, wikipedia, and primary research article). match each source with the best example of when a scientist might use that specific type of source. note: there may be additional uses for these sources that are not listed.
textbook chapter about photosynthesis
article in the magazine scientific american about how research to understand photosynthesis are being applied to improve solar electric technology.
wikipedia entry for photosynthesis
research article in the journal science about how chaparral plants in the field respond to elevated co2 levels.

Explanation:

Textbooks are great for foundational knowledge review, so a textbook chapter about photosynthesis would be used to refresh one's memory about the basic concepts of photosynthesis. Popular - science articles like those in Scientific American present current research applications to a general audience, so the Scientific American article would be used to learn about current applications of photosynthesis research. Wikipedia entries are useful for quick overviews, so the Wikipedia entry for photosynthesis would be used to get a quick summary. Research articles in journals like Science present primary research findings, so the Science research article would be used to look up specific research on how chaparral plants respond to elevated CO2 levels.

Answer:

Textbook chapter about Photosynthesis - Refresh your memory about basic concepts of photosynthesis.
Article in the magazine Scientific American about how research to understand photosynthesis are being applied to improve solar electric technology - Learn what is the current application of photosynthesis research.
Wikipedia entry for Photosynthesis - Get a quick news summary about photosynthesis.
Research article in the journal Science about how chaparral plants in the field respond to elevated CO2 levels - Look up specific research on plant - CO2 response.