Teaching Haryana (HPSC) Assistant Professor Mock Test 2025 Life Sciences System Physiology Plant Sensory photobiology
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