Define aestivation, placentation, actinomorphic

i) Aestivation: The arrangement of accessory floral organs (sepals or petals) in relation to one another in the floral bud is called aestivation.
(ii) Placentation : The . number, position and arrangements or distribution of ovules inside the ovary is called placentation.
(iii) Actinomorphic : A cyclic flower which can be divided into two equal vertical halves or mirror image by any vertical plane is said to be actinomorphic. e.g., Hibiscus, Solanum, etc