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Ans: (a) Dianthus.
Explanation: Free central placentation is found in Dianthus and primrose plants.
Ans: (a) Dianthus
Sol: Free central placentation is found in Dianthus. Parietal placentation is present in Argemone and Brassica whereas Citrus has axile placentation in ovary.
Radial symmetry is found in the flowers of (a) Brassica (b) Trifolium (c) Pisum (d) Cassia.
Cortex is the region found between (a) epidermis and stele (b) pericycle and endodermis (c) endodermis and pith (d) endodermis and vascular bundle.
The term ‘polyadelphous’ is related to (a) gynoecium (b) androecium (c) corolla (d) calyx.