Which of the following statements are true about vernalisation?

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BlackTom AI · Accepted Answer

First, let's restate the question and the options to ensure clarity about what we are evaluating.
Question: Which of the following statements are true about vernalisation?
Answer options provided:
- True spring crops requires vernalisation.
- Increasing day length decreases vernalisation time.
- Time to flowering is extended by exposure to cold temperature.
- Some plants are sown in late spring to escape vernalisation.
- Winter cereals have an obligate vernalisation requirement.

Now, analyze each option carefully and distinguish true statements from false ones, grounding each assessment in how vernalisation works in plant development.

Option 1: True spring crops requires vernalisation.
This statement tries to generalize vernalisation to all spring crops. In reality, vernalisation is particularly a requirement for many winter annuals to flower after winter; spring crops often do not require vernalisation and may even be bred to avoid it. Therefore, this option is false because it incorrectly asserts that all spring crops require vernalisation.

Option 2: Increasing day length decreases vernalisation time.
Vernalisation is a response to exposure to prolonged cold, not to photoperiod per se. While photoperiod can influence flowering pathways in some species, vernalisation time is not known to be reduced simply by longer days; the vernalisation requirement is a cold exposure phenomenon. Thus this statement is inaccurate as a general rule.

Option 3: Time to flowering is extended by exposure to cold temperature.
This is a common misconception. Vernalisation typically accelerates flowering after the cold period by enabling the plant to respond to inductive conditions; it does not generally extend time to flowering. In many vernalised plants, flowering time after vernalisation is shortened relative to non-vernalised counterparts. Hence this option is false.

Option 4: Some plants are sown in late spring to escape vernalisation.
This statement is true. Farmers and researchers may sow certain species or cultivars in late spring to avoid the cold period that would trigger vernalisation, thereby bypassing the vernalisation requirement and aligning flowering with favorable conditions.

Option 5: Winter cereals have an obligate vernalisation requirement.
This is true for many winter cereals (e.g., some varieties of wheat, barley) that cannot flower without a cold-vernalisation period. The term obligate here means the vernalisation is necessary for flowering in those genotypes.

In summary, the two true statements are options 4 and 5, while options 1, 2, and 3 are not correct interpretations of vernalisation biology. If you’re selecting multiple answers, include 4 and 5 as the correct choices.

AGRI20026_2025_SM1 Practice Quiz for Final Exam 2025

Which of the following statements are true about vernalisation?

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