Vernalisation — Prelims Strategy
Prelims Strategy
To effectively tackle NEET questions on vernalisation, a clear conceptual understanding is paramount. Start by memorizing the precise definition and the optimal temperature range ( to ).
Crucially, remember that the apical meristem (shoot apex, embryo) is the site of cold perception, a common point of confusion with photoperiodism (where leaves perceive light). Understand the difference between obligate (absolute requirement) and facultative (accelerates flowering) vernalisation with clear examples like biennials (sugar beet, cabbage) for obligate and some spring annuals for facultative.
Be familiar with devernalisation – the reversal of vernalisation by high temperatures. Another frequently tested point is the role of gibberellins in substituting the cold requirement in some plants.
For conceptual questions, carefully read each option and eliminate distractors based on your understanding of these core principles. For example, if a question asks about the site of perception, immediately rule out leaves.
If it asks about irreversibility, recall devernalisation. Practice distinguishing vernalisation from photoperiodism, as comparison questions are common. Focus on understanding 'why' vernalisation occurs (adaptive significance) rather than just 'what' it is.