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Get Answers to all your Questions
Q5. Define the following terms:
(a) aestivation
(b) placentation
(c) actinomorphic
(d) zygomorphic
(e) superior ovary
(f) perigynous flower
(g) epipetalous stamen
Answers (1)
(a) Aestivation- The mode of arrangement of sepals or petals in the floral bud with respect to the other members of the same whorl is called aestivation. Aestivation in plants can be valvate, Wisted, imbricate, and vexillary.
(b) Placentation- The arrangement of ovules within the ovary is called placentation. There are five types of placentation found in plants including marginal, basal, parietal, axile, and free central placentation.
(c) Actinomorphic- The flowers which can be divided into two radial halves by any radial plane passing through its center are called actinomorphic flowers. E.g. chilly and mustard.
(d) Zygomorphic- The flowers which can be divided into two similar halves by a single vertical plane only are known as zygomorphic flowers. E.g. pea and beans.
(e) Superior ovary- When the gynoecium is present at the highest position, while other floral parts are arranged below it, the ovary is said to be a superior ovary. A flower with this arrangement is described as hypogynous. Examples include brinjal and mustard.
(f) Perigynous flower- When the gynoecium is present in the center while the rest of the floral parts are present at the rim of the thalamus at the same level as gynoecium, the flower is called perigynous flower. E.g. plum and rose.
(g) Epipetalous stamen- The stamen which remains attached to the petals are called epipetalous stamens. E.g brinjal
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