NEET-UG Biology · Class 11
Photoperiodism and vernalisation — NEET & JEE Questions
Photoperiodism and vernalisation is a topic in Plant Growth and Development, a Class 11 Biology chapter of the NEET-UG syllabus. TestBudy holds 12 published NEET-UG questions on Photoperiodism and vernalisation, each with the marking scheme of the real paper.
- questions
- 12
- shown here
- 10
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Photoperiodism and vernalisation MCQs with solutions
10 of the 12 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.
What does photoperiodism describe?
- A. Response to day-night length
- B. Response only to soil minerals
- C. Response only to gravity
- D. Seed dispersal by wind
Why can prolonged low temperature promote flowering in some plants?
- A. It permanently destroys the shoot apex
- B. It fulfils a vernalisation requirement
- C. It replaces every light requirement
- D. It stops all gene expression
Photoperiodism is the response of plants to
- A. relative lengths of day and night
- B. soil pH only
- C. gravity only
- D. mineral concentration only
Vernalisation is the induction or acceleration of flowering by exposure to
- A. low temperature
- B. high salinity
- C. continuous darkness only
- D. high carbon dioxide
The site of perception of light in plants during photoperiodism is
- A. Leaf
- B. Shoot apex
- C. Stem
- D. Axillary bud
A plant flowers only when nights are sufficiently long. Which environmental cue is it using?
- A. Atmospheric nitrogen
- B. Soil salinity
- C. Photoperiod
- D. Root pressure
A long-day plant flowers when nights become shorter than a critical duration. This illustrates that flowering can depend strongly on
- A. photoperiod
- B. soil texture only
- C. root pressure
- D. transpiration pull only
Winter wheat is exposed to prolonged cold before being transferred to favourable growth conditions, after which it flowers earlier. The cold treatment is an example of
- A. vernalisation
- B. etiolation
- C. photolysis
- D. abscission
Seeds of a winter variety are chilled before sowing, and the plants flower earlier than unchilled controls. What is the best conclusion?
- A. Every cell became meristematic
- B. Chilling converted them into long-day plants
- C. Cold replaced all hormonal control
- D. Cold met a vernalisation requirement
A short-day plant receives a brief flash of light in the middle of a long night and fails to flower. What does this suggest?
- A. An uninterrupted dark period is important for its flowering response
- B. Only total daily light energy matters
- C. Night length has no role
- D. Cold treatment is the sole flowering signal
Common mistakes in Photoperiodism and vernalisation
Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.
- Assumes cold promotes flowering only by slowing growth.
- Uses the two flowering-control mechanisms interchangeably.
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