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Difficulty: HardRhetorical Synthesis: Comparison and Contrast

While preparing a presentation on desert plant adaptations, a student took the following notes:

* The Saguaro cactus (*Carnegiea gigantea*) is native to the Sonoran Desert in North America.
* The Saguaro cactus absorbs seasonal rainfall using a shallow, widespread root system.
* *Welwitschia mirabilis* is native to the Namib Desert in southwestern Africa.
* *Welwitschia mirabilis* absorbs moisture from coastal fog directly through its two broad leaves.
* *Welwitschia mirabilis* has a long taproot, but it is used primarily for anchoring the plant rather than absorbing water.

The student wants to contrast the water-acquisition methods of the Saguaro cactus and *Welwitschia mirabilis*. Which choice most effectively uses information from the given notes to accomplish this goal?

  1. While the Saguaro cactus absorbs seasonal rainfall through a shallow root system, Welwitschia mirabilis absorbs moisture from coastal fog directly through its leaves.Answer
  2. B
    The Saguaro cactus is native to the Sonoran Desert of North America, whereas Welwitschia mirabilis is native to the Namib Desert of southwestern Africa.
  3. C
    To survive in arid environments, the Saguaro cactus stores water in its ribbed stem, while Welwitschia mirabilis has a long taproot to anchor itself.
  4. D
    Although both plants utilize their root systems to absorb moisture from their environments, the Saguaro cactus has shallow roots and Welwitschia mirabilis has a taproot.

Answer

While the Saguaro cactus absorbs seasonal rainfall through a shallow root system, Welwitschia mirabilis absorbs moisture from coastal fog directly through its leaves.
The correct option effectively fulfills the prompt's goal by contrasting the specific water-acquisition methods of the Saguaro cactus (absorbing rainfall via its root system) and Welwitschia mirabilis (absorbing fog moisture through its leaves) using accurate details from the notes.

Step-by-Step Solution

1
Identify the student's goal.
The goal is to contrast the water-acquisition methods of the Saguaro cactus and Welwitschia mirabilis.
The prompt asks to specifically contrast how these two plants acquire water.
2
Analyze the notes for information about water-acquisition methods.
The notes state that the Saguaro cactus absorbs seasonal rainfall using roots, while Welwitschia mirabilis absorbs moisture from coastal fog through its leaves (its taproot is only for anchoring, not water absorption).
This establishes the factual basis for the contrast required by the prompt.
3
Evaluate the choices to see which one correctly contrasts these two methods.
The statement describing the Saguaro absorbing rainfall via roots and Welwitschia absorbing fog via leaves is the only choice that accurately contrasts their water-acquisition methods.
Other choices either focus on different contrasting details (such as habitat or anchoring vs. storage) or misinterpret the notes by claiming both use roots for absorption.

Key Concept

Rhetorical Synthesis: Comparison and Contrast
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Topics

Rhetorical Synthesis: Comparison and Contrast

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