MHT CET 202621 AprilEvening Shift
- Exam
- MHT CET
- Year
- 2026
- Date
- 21 April
- Shift
- Evening Shift
- Subject
- Biology
- Chapter
- Plant - Growth and Development
MHT CET 2026 · 21 April · Evening Shift · Biology · Plant - Growth and Development
Given below are two statements, one is labelled as Assertion (A)...
Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): Leaves produce a light receiving protein that induces flowering.
Reason (R): The Protein phytochrome present in leaves detects the duration of light and dark periods and help in flowering.
In light of the above statements, choose the correct answer from the options given below.
Assertion (A): Leaves produce a light receiving protein that induces flowering.
Reason (R): The Protein phytochrome present in leaves detects the duration of light and dark periods and help in flowering.
In light of the above statements, choose the correct answer from the options given below.
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A).
- BBoth (A) and (R) are true but (R) is NOT the correct explanation of (A).
- C(A) is true but (R) is false.
- D(A) is false but (R) is true.
Correct answer
A. Both (A) and (R) are true and (R) is the correct explanation of (A).
Step-by-step solution
Assertion (A) states that leaves produce a light-receiving protein that induces flowering. This is true because leaves act as the site of perception for light and dark durations (photoperiodism), which is essential for inducing flowering in plants.
Reason (R) identifies this light-receiving protein as phytochrome. Phytochrome is a proteinaceous pigment present in leaves that detects the specific duration of light and dark periods. Upon receiving the appropriate photoperiodic stimulus, it initiates a signaling cascade that leads to the synthesis of the flowering hormone (florigen), which then migrates to the shoot apices to induce flowering.
Thus, both (A) and (R) are true, and (R) provides the correct explanation for (A) by naming the protein and explaining its mechanism.
Answer: Both (A) and (R) are true and (R) is the correct explanation of (A).
Reason (R) identifies this light-receiving protein as phytochrome. Phytochrome is a proteinaceous pigment present in leaves that detects the specific duration of light and dark periods. Upon receiving the appropriate photoperiodic stimulus, it initiates a signaling cascade that leads to the synthesis of the flowering hormone (florigen), which then migrates to the shoot apices to induce flowering.
Thus, both (A) and (R) are true, and (R) provides the correct explanation for (A) by naming the protein and explaining its mechanism.
Answer: Both (A) and (R) are true and (R) is the correct explanation of (A).