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Ans: (a) epidermis and stele
Explanation: The outermost layer is epidermis and below epidermis cortex cells are present. Stele is the part below endodermis but endodermis is not a part of stele, and cortex also does not include in stele.
Radial symmetry is found in the flowers of (a) Brassica (b) Trifolium (c) Pisum (d) Cassia.
Freecentral placentation is found in (a) Dianthus (b) Argemone (c) Brassica (d) Citrus.