Vegetative Morphology — BIO BOTANY STD 11 — Question
Tamilnadu BoardEnglish MediumSTD 11BIO BOTANYVegetative Morphology5 Marks
Question
How the duration of leaf is determined? Classify leaves according to duration.
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Answer
Leaves may stay and function for few days to many years, largely determined by the adaptations to climatic conditions.
Cauducuous (Fagacious): Falling off soon after formation, e.g., Opuntia and Cissus quadrangularis.
Deciduous: Falling at the end of growing season so that the plant (tree or shrub) is leafless in winter / summer season, e.g., Maple, Plumeria, Launea and Erythrina.
Evergreen: Leaves persist throughout the year, falling regularly so that tree is never leafless. e.g., Mimusops and Calophyllum.
Marcescent: Leaves not falling but withering on the plant as in several members of Fagaceae.
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