Photoperiodism and vernalisation — practice questions
5 questions in the bank on this idea. Below are 5 of them, exactly as they appear in a test.
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
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
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
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