e A statement value to B-0.05. Follow the language in the pages above on how to

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e A statement value to B-0.05. Follow the language in the pages above on how to write about your statistical test results, after the explanations of how to do a t-test in Excel and JMP Answers all the questions below. with the conclusion(s) you draw from the t-test results, comparing your p Follow-up questions (answer any 5 of the As you will see in this lab activity, plants confronted with different environmental conditions vary the number of stomata per unit area by quite a lot. Yet, in theory the same result due to having more stomata could be attained by simply having bigger stomata with no difference in stomata number however, plants Why might plants vary stomata density rather than stomata size? 1. vary stomata number and not stomata size. Why might it be adaptive for stomata to occur mostly (if not entirely) on the undersides of leaves? What plants show the reverse pattern for which stomata are only on the upper leaf surface? 2. 3. Diagram and describe some of the physical aspects of leaf design that would reduce water loss in a dry environment. Specifically address how leaf size, shape, orientation to the sun, color, fuzziness, thickness, water-proofing, stomata design, stomata density, etc., might vary from a wet to a dry environment. 4. Climate change due to the rapidly increasing levels of greenhouse gases (particularly CO2) in our atmosphere is a serious current global concern. How might stomata density serve as a bioindicator for monitoring the response of plants to changes in greenhouse gas concentrations in the future? (Hint: what do the data say for how stomata density varies with CO2 concentration?) As a related question to the one above, how might stomata density serve as a bioindicator for estimating Co, concentrations in the past (paleoclimates)? 5. Among bryophytes, stomata are restricted to the sporophyte life stage (found in mosses and some hornworts). Why? Why might it be adaptive for only the sporophyte and not the 6. gametophyte stage in the life cycle to possess stomata?

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