Evidence: The entire passage focuses on the author's experiments testing how different temperatures impact the leaves of the Drosera plant. For example, in lines 6-9, the author explicitly states his purpose: "I wished, therefore, to ascertain whether heat alone would induce inflection, and what temperature was the most efficient." He then describes in detail how he exposed the leaves to various temperatures and observed the effects.

B, C, and D are incorrect because while the passage does discuss leaf movements, it does not aim to discover them (B), reject a hypothesis about them (C), or support a hypothesis about them (D). The author is conducting an open-ended exploration, not testing a specific hypothesis.

Evidence: As explained above, lines 6-9 directly state the author's goal of determining how temperature affects the leaves and finding the optimal temperature for inducing leaf movement. This supports the main idea of exploring temperature effects.

A, C, and D are incorrect because they do not state the main purpose of the experiments. A (lines 1-6) provides background context, C (lines 45-51) mentions a related phenomenon but doesn't state the experiment's goal, and D (lines 69-75) describes a specific result but not the overall aim.

Evidence: The passage does not mention using sunlight or testing the sun's effects on the leaves at any point. The experiments exclusively use heated water to expose the leaves to different temperatures, as seen in lines 24-25 ("immersed in water") and lines 53-54 ("placed in water at this temperature").

A, B, and C are incorrect because the passage does mention those factors. It discusses the aggregation process in lines 13-14, 25-26, 35-36, and 58-59. Exposure to different temperatures is a central focus throughout the passage (e.g., lines 6-7, 9-10, 18-19, 28-29, 54-55). Immersion of leaves in water is described in lines 8-9, 17-18, 24-25, and 53-54.

Evidence: Lines 51-57 state: "It deserves notice that the leaves of Drosera, after being immersed in water at 130 oF, are excited into movement by a solution of the carbonate so strong that it would paralyze ordinary leaves and cause no inflection." This directly indicates that Drosera leaves can withstand and respond to intense carbonate solutions that would harm regular leaves.

A is incorrect because lines 10-13 say that 130°F does not cause leaf inflection, only temporary paralysis. B is incorrect because the passage does not mention Drosera leaves shriveling from heat, only some glands becoming porcelain-like or disintegrating. D is incorrect because the passage does not suggest Drosera leaves are less heat-tolerant than other leaves.

Evidence: As explained in question 46, lines 51-57 directly state that Drosera leaves can be stimulated by strong carbonate solutions that would immobilize and fail to trigger movement in regular leaves. This supports the idea that Drosera leaves thrive in intense solutions compared to other leaves.

A, C, and D are incorrect because they do not provide evidence for Drosera leaves' unique ability to tolerate intense solutions. They discuss other aspects of the experiment, such as temporary heat paralysis (A), lack of tentacle inflection at 150°F (C), and variation in heat resistance (D).

Evidence: In lines 45-48, the author states: "A temporary suspension of the power of movement due to heat is called by Sachs heat-rigidity." In this context, "suspension" refers to a temporary stop or pause in the leaves' ability to move, not a permanent removal or elimination of that ability.

B, C, and D are incorrect because they do not fit the context of a temporary halt in movement. "Removal" (B) and "elimination" (C) suggest a complete loss of movement ability, while "exclusion" (D) implies preventing movement rather than pausing it.

Evidence: The first paragraph presents the author's postulation or hypothesis that heat alone can cause leaf inflection and that there is an optimal temperature for this effect (lines 6-9). The rest of the passage then details the author's experimental trials testing this hypothesis and reporting the results.

A, B, and D are incorrect because they do not accurately characterize the relationship between the first paragraph and the rest of the passage. There is no challenge or debate (A), specific instance or generalization (B), or prediction or analysis (D). The passage follows a clear structure of hypothesis followed by experiment.

Evidence: Throughout the passage, the author maintains a neutral, factual tone, focusing on describing the experimental methods and results without expressing personal opinions or emotions. The language is technical and precise, with references to specific temperatures, time periods, and observed effects. The author presents limitations and variations in the data, suggesting an unbiased approach.

A, C, and D are incorrect because the passage does not demonstrate an indifferent (A), emotional (C), or biased (D) tone. The author shows genuine interest in the subject and includes some emphatic phrases like "scarcely possible" and "deserves notice," countering indifference. However, there is no emotionally charged or overtly persuasive language, maintaining objectivity rather than revealing strong emotions or bias.

Evidence: In both graphs, the blue line representing cumulative area during normal temperatures shows consistent growth over time, reaching around 1000 mm2 by the 60-minute mark. This line also maintains higher values than the other temperature categories (warm and cold) throughout the experiments.

B is incorrect because the red line for warm temperatures shows only modest cumulative area increases, leveling off around 400 mm2 in both experiments, well below the normal temperature values. C is incorrect because while warm temperatures in experiment 1 slightly outpace normal temperatures in experiment 2 early on, the latter surpasses the former by the end. D is incorrect because normal temperatures clearly remain high in both experiments, countering the claim that no categories stay high over time.

Evidence: In lines 100-102, the author describes how exposure to 150°F temperatures causes the protoplasm to be "converted into disintegrated or pulpy discolored matter." In this context, "matter" refers to the physical substance or material that the protoplasm becomes, aligning with the definition of "substance."

A, B, and C are incorrect because "matter" is not used to mean "content" (information or ideas, A), "importance" (significance or value, B), or "affair" (an event or situation, C). The passage focuses on the physical transformation of the protoplasm, not abstract concepts.