Which of the following statements accurately describes the relationship between Phytochrome Red (Pr) and Phytochrome Far-Red (Pfr) in plants?
1
Pr and Pfr are completely independent phytochrome forms that do not interconvert under any light conditions.
2
Pr is converted to Pfr under far-red light, and this form is associated with inhibiting seed germination and other photomorphogenic responses.
3
Pr is converted to Pfr under red light, and Pfr is the active form that promotes seed germination and other photomorphogenic responses.
4
Both Pr and Pfr forms are active under blue light, directly influencing the opening and closing of stomata without conversion.
5
Question Not Attempted