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Difficulty: EasyIdentifying Core Claims and Hypotheses

### Plant Growth and Light Wavelengths

Two students discuss how the color of light affects plant growth. Both students agree that light is necessary for plants to produce food, but they disagree on which color of light is most effective.

Student 1
Plants grow tallest and healthiest when exposed to green light. Leaves appear green because they contain chlorophyll, a pigment that is naturally tuned to green wavelengths. Therefore, chlorophyll absorbs green light more efficiently than any other color, leading to higher rates of photosynthesis and growth.

Student 2
Plants grow tallest and healthiest when exposed to blue and red light. Chlorophyll absorbs blue and red light to power photosynthesis, while reflecting green light. Because green light is reflected rather than absorbed, plants exposed only to green light will exhibit very little growth.

Based on the passage, which of the following statements best represents the core hypothesis of Student 1?

  1. A
    Plants grow best under blue and red light because chlorophyll absorbs blue and red light to power photosynthesis.
  2. B
    Plants grow best under green light because leaves reflect green light and absorb blue and red light.
  3. Plants grow best under green light because chlorophyll absorbs green light more efficiently than any other color.Answer
  4. D
    Plants grow best under all colors of light equally because leaves contain multiple pigments.

Answer

Plants grow best under green light because chlorophyll absorbs green light more efficiently than any other color.
Student 1's main claim is that plants grow tallest under green light because their chlorophyll absorbs green wavelengths of light more efficiently. This matches the correct option.

Step-by-Step Solution

1
Identify the student whose claim is being asked about.
The question asks for the core hypothesis of Student 1.
This narrows the search in the passage to the section labeled 'Student 1'.
2
Locate Student 1's hypothesis in the passage.
Student 1 states that plants grow tallest under green light because chlorophyll absorbs green light more efficiently than any other color.
Comparing this located claim with the given choices reveals the correct option.

Key Concept

Identifying Core Claims and Hypotheses
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Topics

Identifying Core Claims and Hypotheses

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