question_answer 5)

What do you understand by photoperiodisffl and vernalisation? Describe their significance. 

Answer:

Photoperiodism The response of plants to periods of day/night is termed as photoperiodism. The site of perception of light/dark duration are the leaves. Significance The significance of photoperiodism is in regulating flowering in plants. Flowering is an important step towards seed formation and seeds are responsible for continuing the generation of a plant- Vernalisation There are plants in which flowering is either quantitatively or qualitatively dependent on exposure to low temperature. This phenomenon is termed as vernalisation. Vernalisation refers specially to the promotion of flowering by a period of low temperature. Significance Vernalisation prevents precocious reproductive development late in the growing season. This enables the plant to have sufficient time to reach maturity.