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Placentation and families
Concepts tested here
- Marginal placentation
All Questions
2012 AIPMT-MAINS 1 question
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How many plants in the list given below have marginal placentation?
Mustard, Gram, Tulip, Asparagus, Arhar, Sun hemp, Chilli, Colchicine, Onion, Moong, Pea, Tobacco, LupinMarginal placentation (ovules borne on a ridge along the ventral suture of a monocarpellary ovary) is the characteristic of the family Fabaceae (legumes).
Members of Fabaceae in the list: Gram, Arhar, Sun hemp, Moong, Pea and Lupin, which makes six plants.
Mustard (Brassicaceae) has parietal placentation.
Tulip, Asparagus, Colchicine (the plant $Colchicum$) and Onion belong to Liliaceae and have axile placentation.
Chilli and Tobacco belong to Solanaceae and have axile placentation.
So six plants have marginal placentation.