MHT CET 202625 AprilMorning Shift
- Exam
- MHT CET
- Year
- 2026
- Date
- 25 April
- Shift
- Morning Shift
- Subject
- Biology
- Chapter
- Plant - Growth and Development
MHT CET 2026 · 25 April · Morning Shift · Biology · Plant - Growth and Development
Which of the following statements are CORRECT about phytochromes?...
Which of the following statements are CORRECT about phytochromes?
A. Phytochrome pigment exists in two forms.
B. Two forms of phytochrome are interconvertible.
C. Pfr form of phytochrome inhibits flowering in SDP during day time.
D. Pfr form of phytochrome inhibits flowering in LDP during day time
E. During day time Pr is accumulated in plants.
A. Phytochrome pigment exists in two forms.
B. Two forms of phytochrome are interconvertible.
C. Pfr form of phytochrome inhibits flowering in SDP during day time.
D. Pfr form of phytochrome inhibits flowering in LDP during day time
E. During day time Pr is accumulated in plants.
Options
- AA, B and C only
- BA, D and E only
- CB and C only
- DD and E only
Correct answer
A. A, B and C only
Step-by-step solution
Phytochrome is a photoreceptor pigment that exists in two interconvertible forms: (red light absorbing) (far-red light absorbing).
absorbs red light and converts into , while absorbs far-red light and converts back into .
During the day time, sunlight contains more red light, leading to the accumulation of the form, not .
The form is the physiologically active form. It promotes flowering in Long Day Plants (LDP) and inhibits flowering in Short Day Plants (SDP).
Thus, statements A, B, and C are correct, while D and E are incorrect.
Answer: A, B and C only
absorbs red light and converts into , while absorbs far-red light and converts back into .
During the day time, sunlight contains more red light, leading to the accumulation of the form, not .
The form is the physiologically active form. It promotes flowering in Long Day Plants (LDP) and inhibits flowering in Short Day Plants (SDP).
Thus, statements A, B, and C are correct, while D and E are incorrect.
Answer: A, B and C only