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The P form absorbs light between 660 to 680 nm and absorbs at a peak of 666 nm. It is the form synthesized in dark-grown seedlings. When Pr absorbs red light, it is converted to the Pfr form.

1. The P form absorbs light between 660 to 680 nm.
2. The P form absorbs at a peak of 666 nm.
3. The P form is synthesized in dark-grown seedlings.
4. The P form is converted to the Pfr form when it absorbs red light.

Correct answer: The P form is converted to the Pfr form when it absorbs red light.

Solution

The correct statement is the one that describes the functional change caused by red light: Pr absorbs red light and is converted to Pfr. The other options describe absorption properties or synthesis conditions, not the conversion event itself.

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