Define the following terms

(a) Aestivation

(b) Placentation

(c) Actinomorphic

(d) Zygomorphic

(e) Superior ovary

(f) Perigynous flower

(g) Epipetalous Stamen

Asked by Pragya Singh | 1 year ago |  56

1 Answer

Solution :-

(a) Aestivation: The term aestivation refers to the mode in which sepals or petals are arranged in a floral bud with respect to other floral members. There are four types of aestivation in plants i.e., valvate, twisted imbricate, and vexillary.

(b) Placentation: The term ‘placentation’ refers to the arrangement of ovules within the ovary of a flower. It is primarily of five types namely marginal, basal, parietal, axile, and free central.

(c) Actinomorphic: Actinomorphic flowers can be divided into two radial halves by any radial plane passing through its centre. Examples of these flowers include chilly and mustard.

(d) Zygomorphic: Zygomorphic flowers are those flowers which can be divided into two similar halves by a single vertical plane. In other words zygomorphic flowers have bilateral symmetry. Examples include pea and beans

(e) Superior ovary: Superior ovary flowers are those flowers in which the gynoecium is present at the highest position while other floral parts are arranged below it. A flower with this arrangement is described as hypogynous. Examples include brinjal and mustard.

(f) Perigynous flower In perigynous flowers, the thalamus forms a cup shaped structure and from the rim of the cup floral parts arise. In this condition the position of the ovary is said to be half superior and half inferior.Examples include plum and rose.

(g) Epipetalous Stamen: Epipetalous stamens are stamens attached to the petals. They are found in brinjal

Answered by Abhisek | 1 year ago

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