Question:
If the dark period is interrupted even by a flash of light, plants like tobacco and soybean ______
If the dark period is interrupted even by a flash of light, plants like tobacco and soybean ______
Show Hint
Tobacco and soybean are short-day plants that really need an unbroken long night to flower.
Updated On: Nov 12, 2026
- will not flower.
- will flower immediately.
- will give more flowers.
- cannot be made to flower again.
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
Tobacco and soybean are short-day plants. They flower only when the dark period is longer than a critical length, so they are actually long-night plants.
Step 2: Effect of a light flash
A brief flash of light in the middle of the night converts phytochrome back to its inactive form and breaks the long dark period.
The plant then treats the night as too short.
Step 3: Result
Because the unbroken night is lost, the flowering signal is not produced and the plants do not flower.
Final Answer:
Such plants will not flower. \[ \boxed{\text{(A) }\text{will not flower.}} \]
Tobacco and soybean are short-day plants. They flower only when the dark period is longer than a critical length, so they are actually long-night plants.
Step 2: Effect of a light flash
A brief flash of light in the middle of the night converts phytochrome back to its inactive form and breaks the long dark period.
The plant then treats the night as too short.
Step 3: Result
Because the unbroken night is lost, the flowering signal is not produced and the plants do not flower.
Final Answer:
Such plants will not flower. \[ \boxed{\text{(A) }\text{will not flower.}} \]
Was this answer helpful?
0
0
Top MHT CET Biology Questions
- During r- DNA technology, which one of the following enzymes is used for cleaving DNA molecule ?
- Important sperm lysin used for dissolving egg covering is
- In biogas plant, the role of acidogenic bacteria is to
- In $C_{3}$ plants, the first stable product of photosynthesis during the dark reaction is
- In case of anaerobic respiration, the RQ is ___________
View More Questions
Top MHT CET Photo Periodism Questions
- While studying flowering behaviour in ________ and ________ plant, Garner and Allard discovered photoperiodism.
- Tobacco plants produce flowers in the following conditions EXCEPT:
- If the dark period is interrupted by a flash of red light of 660 nm, then the short day plants do not flower. But if it is followed by ____, these plants will flower.
- 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. - Given below are two statements:
Statement (I): SDP require long uninterrupted dark period for flowering.
Statement (II): If dark period is interrupted even by a flash of light, SDP will flower.
In light of the above statements, choose the most appropriate answer from the options given below.
View More Questions
Top MHT CET Questions
- During r- DNA technology, which one of the following enzymes is used for cleaving DNA molecule ?
- In non uniform circular motion, the ratio of tangential to radial acceleration is (r = radius of circle, $v =$ speed of the particle, $\alpha =$ angular acceleration)
- The temperature of $32^{\circ}C$ is equivalent to
- The line $5x + y - 1 = 0$ coincides with one of the lines given by $5x^2 + xy - kx - 2y + 2 = 0 $ then the value of k is
- The heat of formation of water is $ 260\, kJ $ . How much $ H_2O $ is decomposed by $ 130\, kJ $ of heat ?
View More Questions